bluuebunny/crossref_metadata_2025_split huggingface dataset:
Preparation and performances of ethylene–propylene–diene terpolymer/acrylic rubber reinforced with a dough‐modeling compound
Authors: Wu Weili , Chen Dajun 
Published: October 2007

AbstractA novel composite was prepared by the addition of a dough‐modeling compound (DMC) reinforcement and an ethylene–propylene–diene terpolymer (EPDM)/acrylic rubber (ACM) matrix. We studied the DMC/EPDM/ACM mass ratio and vulcanizing process by testing the tensile strength, Shore A hardness, elongation at break, and wear and thermal properties. The results show that the mechanical properties, thermal properties, and wear resistance of the composites were good when the DMC/EPDM/ACM mass ratio was 70/25/75 and the cure conditions were 180°C under 10 MPa for 25 min. The crosslinking structure of the composites was studied by IR, and this further proved the interaction between DMC, ACM, and EPDM. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
Preparation and characterization of chloromethylated/quaternized poly(phthalazinone ether sulfone ketone) for positively charged nanofiltration membranes
Authors: Yan Chun , Zhang Shouhai , Yang Daling , Jian Xigao 
Published: October 2007

AbstractChloromethylated poly(phthalazinone ether sulfone ketone) (CMPPESK) as a novel membrane material was successfully prepared from poly(phthalazinone ether sulfone ketone), with concentrated sulfuric acid as the solvent and catalyst, and chloromethyl octyl ether with lower toxicity as the chloromethylated regent. The effects of the reaction conditions on the preparation of CMPPESKs with different degrees of chloromethylation were examined. The quantity of chloromethyl groups per repeated unit (DCM) of CMPPESK was determined by the method of analysis of the chlorine element, and structures were characterized by 1H‐NMR spectroscopy. The introduction of chloromethyl groups into the polymer chains led to a decrease in the decomposition temperature. With increasing DCM, the initial degradation temperature declined. CMPPESK had good solubility and was soluble in N‐methyl‐2‐pyrrolidone (NMP), N,N‐dimethylacetamide (DMAc), and chloroform. However, quaternized poly(phthalazinone ether sulfone ketone) (QAPPESK) had excellent solvent resistance, was only partly soluble in sulfuric acid (98%), and was swollen in N,N‐dimethylformamide. QAPPESK nanofiltration (NF) membranes had about 90% rejection for MgCl2, and the performance of the NF membrane prepared with DMAc as the solvent was superior to that of the NF membrane prepared with NMP as the solvent. In addition, the rejection to the different salt solutions followed the following sequence: MgCl2 > MgSO4 > NaCl > Na2SO4. Furthermore, the thermotolerance of the QAPPESK NF membrane was examined, and the results show that when the solution temperature rose from 11 to 90°C, the water flux increased more than threefold with stable salt rejection. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
Experimental characterization of traditional composites manufactured by vacuum‐assisted resin‐transfer molding
Authors: Cecen Volkan , Sarikanat Mehmet 
Published: October 2007

AbstractThe primary purpose of this study is to investigate the anisotropic behavior of different glass‐fabric‐reinforced polyester composites. Two commonly used types of traditional glass fabrics, woven roving fabric and chopped strand mat, have been used. Composite laminates have been manufactured by the vacuum infusion of polyester resin into the fabrics. The effects of geometric variables on the composite structural integrity and strength are illustrated. Hence, tensile and three‐point‐bending flexural tests have been conducted at different off‐axial angles (0, 45, and 90°) with respect to the longitudinal direction. In this study, an important practical problem with fibrous composites, the interlaminar shear strength as measured in short‐beam shear tests, is discussed. The most significant result deduced from this investigation is the strong correlation between the changes in the interlaminar shear strength values and fiber orientation angle in the case of woven fabric laminates. Extensive photographs of fractured tensile specimens resulting from a variety of uniaxial loading conditions are presented. Another aim of this work is to investigate the interaction between the glass fiber and polyester matrix. The experiments, in conjunction with scanning electron photomicrographs of fractured surfaces of composites, are interpreted in an attempt to explain the interaction between the glass fiber and polyester. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
Synthesis, characterization, and comparison of properties of novel fluorinated poly(imide siloxane) copolymers
Authors: Ghosh Anindita , Banerjee Susanta 
Published: October 2007

AbstractFour new poly(imide siloxane) copolymers were prepared by a one‐pot solution imidization method at a reaction temperature of 180°C in ortho‐dichlorobenzene as a solvent. The polymers were made through the reaction of o‐diphthaleic anhydride with four different diamines—4,4′‐bis(p‐aminophenoxy‐3,3″‐trifluoromethyl) terphenyl, 4,4′‐bis(3″‐trifluoromethyl‐p‐aminobiphenyl ether)biphenyl, 2,6‐bis(3′‐trifluoromethyl‐p‐aminobiphenyl ether)pyridine, and 2,5‐bis(3′‐trifluoromethyl‐p‐aminobiphenylether)thiopene—and aminopropyl‐terminated poly dimethylsiloxane as a comonomer. The polymers were named 1a, 1b, 1c, and 1d, respectively. The synthesized polymers showed good solubility in different organic solvents. The resulting polymers were well characterized with gel permeation chromatography, IR, and NMR techniques. 1H‐NMR indicated that the siloxane loading was about 36%, although 40 wt % was attempted. 29Si‐NMR confirmed that the low siloxane incorporation was due to a disproportionation reaction of the siloxane chain that resulted in a lowering of the siloxane block length. The films of these polymers showed low water absorption of 0.02% and a low dielectric constant of 2.38 at 1 MHz. These polyimides showed good thermal stability with decomposition temperatures (5% weight loss) up to 460°C in nitrogen. Transparent, thin films of these poly(imide siloxane)s exhibited tensile strengths up to 30 MPa and elongations at break up to 103%, which depended on the structure of the repeating unit. The rheological properties showed ease of processability for these polymers with no change in the melt viscosity with the temperature. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
Synthesis and characterization of air‐stable magnetic Fe composites microspheres of narrow size distribution
Authors: Shpaisman Nava , Margel Shlomo 
Published: October 2007

AbstractAir‐stable Fe magnetic nanoparticles entrapped within carbon and porous crosslinked polystyrene microspheres of narrow size distribution were prepared by the following sequential steps: (1) Polystyrene/poly(divinyl benzene) and polystyrene/poly(styrene‐divinyl benzene) uniform micrometer‐sized composite particles were prepared by a single‐step swelling of uniform polystyrene template microspheres dispersed in an aqueous continuous phase with emulsion droplets of dibutyl phthalate containing the monomers divinyl benzene and styrene and the initiator benzoyl peroxide. The monomers within the swollen polystyrene template microspheres were then polymerized by raising the temperature to 73°C; (2) Porous poly (divinyl benzene) and poly(styrene‐divinyl benzene) uniform crosslinked microspheres were prepared by dissolution of the polystyrene template part of the former composite particles; (3) Uniform magnetic poly(divinyl benzene)/Fe and poly(styrene‐divinyl benzene)/Fe composite microspheres were prepared by entrapping Fe(CO)5 within the porous crosslinked microspheres, by suction of the Fe complex into the dried porous particles, followed by decomposition of the encapsulated Fe(CO)5 at 200°C in Ar atmosphere; (4) Uniform magnetic air‐stable C/Fe composite microspheres were prepared similarly, apart from changing the decomposition temperature from 200 to 600°C. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
The effect of carbon fiber content on the friction and wear properties of carbon fiber reinforced polyimide composites
Authors: Li Jian , Cheng Xianhua 
Published: October 2007

AbstractThe current study examines the tribological performance of polyimide and carbon fiber reinforced polyimide (CF/PI) under dry sliding condition. Different contents of carbon fibers were employed as reinforcement. All filled and unfilled polyimide composites were tested against CGr15 ball and representative testing was performed. The effects of carbon fiber content on tribological properties of the composites were investigated. The worn surface morphologies of neat PI and its composites were examined by scanning electron microscopy and the wear mechanisms were discussed. Moreover, all filled polyimides have superior tribological characteristics to unfilled polyimides. The optimum wear reduction was obtained when the content of carbon fiber is 20 vol %. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
Influence of an hyperbranched aliphatic polyester on the cure kinetic of a trifunctional epoxy resin
Authors: Frigione Mariaenrica , Calò Emanuela 
Published: October 2007

AbstractThe influence of an OH‐terminated hyperbranched aliphatic polyester on the reaction kinetics and rheology of a trifunctional triglycidyl‐p‐aminophenol (TGAP) epoxy resin cured with an aromatic amine, i.e., diamino‐diethyltoluene (DETDA), was investigated. The hyperbranched polymer was expected to enhance the reactivity of the trifunctional epoxy resin; a limited modification in the rheology of the trifunctional epoxy resin with the addition of the hyperbranched polymer, however, was not excluded. The reaction mechanism between DETDA amine and TGAP resin is very complex; therefore, a phenomenological kinetic model was employed. The autocatalytic model chosen was able to fit the experimental calorimetric data for the trifunctional epoxy resin as well as for its mixtures with the hyperbranched polymer. The effect of the OH‐terminated hyperbranched aliphatic polyester (H 30) on the reactivity of the trifunctional epoxy resin was marked, with a decrease of the temperatures at which the crosslinking reactions begin, even though a reduced rate of the curing reactions was observed. However, the completion of the reactions occurred faster and at lower temperatures. The cure mechanism, moreover, remained broadly autocatalytic in nature, regardless of H 30 concentration. Finally, the addition of hyperbranched polymer H 30, even at low percentages, led to a noticeable increase in the viscosity of the resin. This last aspect is believed to restrict to some extent the range of application of such epoxy systems containing the hyperbranched polymer in the traditional processing techniques. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
Novel anion‐exchange organic‐inorganic hybrid membranes prepared through sol‐gel reaction and UV/thermal curing
Authors: Wu Cuiming , Wu Yonghui , Xu Tongwen , Fu Yanxun 
Published: October 2007

AbstractAnion‐exchange organic‐inorganic hybrid membranes were prepared through sol‐gel reaction and UV/thermal curing of positively charged alkoxysilane and the alkoxysilane containing acrylate or epoxy groups. Properties of prepared hybrid membranes were varied by control of the molar ratio of the precursors. It was shown that the thermal degradation temperatures (Td) of the membranes were in the range of 212–226°C, water uptakes in the range of 9.6–14.6% and IEC values in the range of 0.9–1.6 mmol g−1. The hybrid membranes show high permeability to anions, as reflected by the high static transport number (t−) of the anion (Cl−). © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2008
Social and environmental reporting and the corporate ego
Authors: Spence Crawford 
Published: October 2007

AbstractThis paper reports on the results of a qualitative exploration into the target audiences for social and environmental reporting (SER). In spite of the wealth of literature on SER motivations, relatively few studies have sought to ascertain who the key target or actual audiences are for SER. The results of this study, based on interviews with UK SER managers, suggest that investors and employees are overwhelmingly the most important audiences targeted by SER managers. The paper draws on auto‐communication theory to question the extent to which SER serves as a means of engaging in dialogue with stakeholders. It is argued that, beyond sending risk management signals to the financial markets, SER primarily serves as a vehicle whereby organizations can communicate with themselves. Moreover, broader stakeholders might be targeted with SER only insofar as doing so serves as a perceived endorsement of organizational communications, thereby embellishing the corporate ego's fantasy of how it would like to be perceived. Copyright © 2007 John Wiley & Sons, Ltd and ERP Environment.
Effectiveness of a hypermedia tool in the innovative teaching of pneumatic engineering design drawing
Authors: Ramos Barbero B. , Pelaez Vara J. , García Maté E. , Ruiz Calvo J. 
Published: October 2007

AbstractThis article presents research undertaken to determine the quality, effectiveness, and efficiency of the “pneumatic engineering design drawing” hypermedia. Among our reasons for carrying out this research are the implementation of the European Credit Transfer System (ECTS), the inexistence on the market of a similar product, and an increasing daily need for asynchronous teaching methods. Its objectives sought to evaluate the application and its impact on the teaching–learning of pneumatics. Two sources of documentation were used as research strategies: opinion polls and experimentation. Three groups of equal size were formed at random, based on traditional teaching (T), self‐study using multimedia (M), and traditional teaching reinforced by the use of the hypermedia (A). The following rank among some of the more noteworthy conclusions. The hypermedia application has been positively rated. In the group with prior knowledge of the subject, the results of the post‐test are strongly related to those of the pre‐test in pneumatics. There is no empirical evidence to support the affirmation that students in group A achieved better results that those in group M or group T. In group M, academic performance is not directly dependent on the intellectual abilities of the student. The minimum time saving in group M was 42% in comparison with the other two groups. © 2007 Wiley Periodicals, Inc. Comput Appl Eng Educ 15: 289–307, 2007; Published online in Wiley InterScience (www.interscience.wiley.com); DOI 10.1002/cae.20158
Social networking technology: place and identity in mediated communities
Authors: Goodings Lewis , Locke Abigail , Brown Steven D. 
Published: October 2007

AbstractThis paper explores the rise of social networking technology as instances of mediated communities. A dialectic between collectivity and place, resulting in the grounding of a shared sense of the past in a particular place, is at the base of all communities. In this sense, community is, by its very definition, inherently ‘mediated’. We reformulate the notion of a ‘virtual community’ to examine the particular modalities of mediation across interactions occurring on Myspace. Data from two separate conversational exchanges are taken from open access Myspace profiles. Drawing on an approach broadly informed by the principles of Discursive Psychology (DP), we examine how identity is constituted within interaction by drawing on symbolic resources. The significance of place and of establishing a delicate relationship between the on‐line and off‐line accomplishments is underlined. The paper develops the arguments of Benwell & Stokoe (2006) and Dixon & Durrheim (2000) to arrive at an account of ‘place identity’ as the central dynamic in mediated community. Copyright © 2007 John Wiley & Sons, Ltd.
Renewal and resistance: moko in contemporary New Zealand
Authors: Nikora Linda Waimarie , Rua Mohi , Te Awekotuku Ngahuia 
Published: October 2007

AbstractMoko is still here, contrary to the widely held belief that the art and custom of moko—Maori skin adornment—had vanished from New Zealand communities. Over the last two decades an increasingly visible number of Maori have revived and renewed the practice, taking colour into their skin. As an indigenous people, re‐taking moko confronts and refutes the myth of a ‘dying race’. It calls on Maori to recommit to strong Maori identities, customs and traditions and challenges the viewer to re‐examine their social representations of moko and moko wearers. This paper reports the resistance strategies of a group of 83 moko wearers. Strategies include (1) educating, representing and reconstructing; (2) invalidating and minimizing representations; (3) building and enhancing social networks; and (4) securing cultural identity and pride. They reflect the celebration of cultural resilience. Copyright © 2007 John Wiley & Sons, Ltd.
Heavy Metal, identity and the social negotiation of a community of practice
Authors: Snell Dave , Hodgetts Darrin 
Published: October 2007

AbstractPsychologists have raised concerns about Heavy Metal music and possible links with substance misuse and youth suicide. This paper moves beyond this traditional disciplinary focus on negative messages to document the media‐related practices through which a Heavy Metal community is negotiated. Six participants contributed to ethnographic observations, interviews and photo‐voice projects. Results illustrate how socio‐material practices such as dressing a certain way, frequenting a bar and dancing are central to community maintenance and the reaffirmation of shared identities. Findings highlight the need for community psychology research to document the material and symbolic nature of contemporary communal life. Copyright © 2007 John Wiley & Sons, Ltd.
The Application of199Hg NMR and199mHg Perturbed Angular Correlation (PAC) Spectroscopy to Define the Biological Chemistry of HgII: A Case Study with Designed Two‐ and Three‐Stranded Coiled Coils
Authors: Iranzo Olga , Thulstrup Peter W. , Ryu Seung‐baek , Hemmingsen Lars , Pecoraro Vincent L. 
Published: October 2007

AbstractThe use of de novo designed peptides is a powerful strategy to elucidate HgII–protein interactions and to gain insight into the chemistry of HgIIin biological systems. Cysteine derivatives of the designed α‐helical peptides of the TRI family [Ac‐G‐(LaKbAcLdEeEfKg)4‐G‐NH2] bind HgIIat high pH values and at peptide/HgIIratios of 3:1 with an unusual trigonal thiolate coordination mode. The resulting HgIIcomplexes are good water‐soluble models for HgIIbinding to the protein MerR. We have carried out a parallel study using199Hg NMR and199mHg perturbed angular correlation (PAC) spectroscopy to characterize the distinct species that are generated under different pH conditions and peptide TRI L9C/HgIIratios. These studies prove for the first time the formation of [Hg{(TRI L9C)2‐(TRI L9CH)}], a dithiolate–HgIIcomplex in the hydrophobic interior of the three‐stranded coiled coil (TRI L9C)3.199Hg NMR and199mHg PAC data demonstrate that this dithiolate–HgIIcomplex is different from the dithiolate [Hg(TRI L9C)2], and that the presence of third α‐helix, containing a protonated cysteine, breaks the symmetry of the coordination environment present in the complex [Hg(TRI L9C)2]. As the pH is raised, the deprotonation of this third cysteine generates the trigonal thiolate–HgIIcomplex Hg(TRI L9C)3−on a timescale that is slower than the NMR timescale (0.01–10 ms). The formation of the species [Hg{(TRI L9C)2(TRI L9CH)}] is the result of a compromise between the high affinity of HgIIto form dithiolate complexes and the preference of the peptide to form a three‐stranded coiled coil.
Ternary Magnesium Rhodium Boride Mg2Rh1‐xB6+2x with a Modified Y2ReB6‐Type Crystal Structure.
Authors: Alekseeva A. M. , Abakumov A. M. , Chizhov P. S. , Leithe‐Jasper A. , Schnelle W. , Prots Yu. , Hadermann J. , Antipov E. V. , Grin Yu. 
Published: October 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Orderly Aligned and Highly Luminescent Monodisperse Rare‐Earth Orthophosphate Nanocrystals Synthesized by a Limited Anion‐Exchange Reaction.
Authors: Mai Hao‐Xin , Zhang Ya‐Wen , Sun Ling‐Dong , Yan Chun‐Hua 
Published: October 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Nd3N2SeBr: A New Nitride Selenide Bromide of Neodymium with 1∞{[N2Nd3]3+} Strands of Highly Condensed [NNd4]9+ Tetrahedra.
Authors: Lissner Falk , Schleid Thomas 
Published: October 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Controlled Assembly of Zero‐, One‐, Two‐, and Three‐Dimensional Metal Chalcogenide Structures.
Authors: Yuan Min , Dirmyer Matthew , Badding John , Sen Ayusman , Dahlberg Maria , Schiffer Peter 
Published: October 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Highly Efficient Synthesis of Stereodefined Multisubstituted 1,4‐Dicyano‐ and 1‐Cyano‐1,3‐butadienes and Their Reactions with Organolithium Reagents.
Authors: Wang Congyang , Wang Chao , Wang Qifeng , Wang Zhihui , Sun Hui , Guo Xiangyu , Xi Zhenfeng 
Published: October 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
A New Strategy for the Synthesis of Optically Active Benzylic Fluorides and Corresponding Five‐Membered Heteroaromatic Analogues.
Authors: Gree Danielle , Gree Rene 
Published: October 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
High‐Yielding Metalloenzymatic Dynamic Kinetic Resolution of Fluorinated Aryl Alcohols.
Authors: Bogar Krisztian , Baeckvall Jan‐E. 
Published: October 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Tuning the Reactivity of Dirhodium(II) Complexes with Axial N‐Heterocyclic Carbene Ligands: The Arylation of Aldehydes.
Authors: Gois Pedro M. P. , Trindade Alexandre F. , Veiros Luis F. , Andre Vania , Duarte M. Teresa , Afonso Carlos A. M. , Caddick Stephen , Cloke F. Geoffrey N. 
Published: October 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Ruthenium Hydride Catalyzed Regioselective Addition of Aldehydes to Enones to Give 1,3‐Diketones.
Authors: Fukuyama Takahide , Doi Takashi , Minamino Satoshi , Omura Sohei , Ryu Ilhyong 
Published: October 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Enantioselective Mannich‐Type Reaction of Sulfonylimines Having 2‐Pyridylsulfonyl Group as a Novel Stereocontroller.
Authors: Nakamura Shuichi , Sano Hideaki , Nakashima Hiroki , Kubo Koji , Shibata Norio , Toru Takeshi 
Published: October 2007

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.