bluuebunny/crossref_metadata_2025_split huggingface dataset:
Preparation of polyacrylamide hydrogels at various charge densities by postmodification
Authors: Turan Eylem , Demirci Serkan , Caykara Tuncer 
Published: September 2008

AbstractIn this study, first polyacrylamide hydrogels were synthesized by free‐radical crosslinking polymerization of acrylamide monomer with N,N′‐methylenebis(acrylamide) as a crosslinker in an aqueous solution at 22°C. Then, a series of hydrogels at various charge densities were prepared by partial hydrolysis of polyacrylamide precursors in a 0.1M sodium hydroxide solution at 60°C. The hydrolysis time was varied between 20 and 180 min. The chemical structures and internal morphologies of the hydrogels before and after alkaline hydrolysis were characterized with attenuated total reflectance/Fourier transform infrared and scanning electron microscopy measurements. The swelling ratio of the hydrolyzed hydrogels was measured in buffer solutions at various pHs. From differential curves of dQv/dpH versus pH (where Qv is the equilibrium swelling ratio of the hydrogels), the volume phase transition pH of the hydrogels was found to be 4.33 ± 0.05, regardless of the charge density of the hydrogels. In water at 22°C, the hydrogels with greater charge density showed a more rapid swelling rate because of their higher porosity and hydrophilicity. Moreover, in buffer solutions with the pH changing from 9.0 to 2.0 at 22°C, the hydrogels with greater charge density also exhibited a more rapid deswelling rate than the hydrogels with less charge density. In conclusion, the postmodification method is a good way of preparing pH‐sensitive hydrogels with fast responsiveness. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009
Synthesis and properties of monomer casting polyamide 6/poly(methyl methacrylate) blends
Authors: Wu Tongfei , Xie Tingxiu , Yang Guisheng 
Published: September 2008

AbstractWe successfully synthesized monomer casting polyamide 6 (MCPA6)/poly(methyl methacrylate) (PMMA) blends in two steps: (1) radical polymerization of methyl methacrylate in ϵ‐caprolactam and (2) anionic ring‐opening polymerization of this ϵ‐caprolactam solution. The influence of PMMA on the crystallization behavior of MCPA6 was studied with differential scanning calorimetry and X‐ray diffraction, which showed that PMMA could act as a heterogeneous nucleation agent and favored the formation of the γ‐crystalline form. The rheological properties were also studied and indicated that PMMA reduced the interaction between MCPA6 chains by lowering the density of hydrogen bonding. This study used a novel and convenient method to prepare microporous MCPA6/PMMA particles that involved removing the continuous phase. Their surface area and thermal stability were characterized by the Brunauer–Emmett–Teller method and thermogravimetric analysis, respectively. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009
Poly(2‐acrylamido glycolic acid‐co‐2‐acrylamido‐2‐methyl‐1‐propane sulfonic acid): Synthesis, characterization, and retention properties for environmentally impacting metal ions
Authors: Rivas Bernabé L. , Maureira Antonio , Guzmán Catherine , Mondaca M. Angélica 
Published: September 2008

AbstractPoly(2‐acrylamido glycolic acid‐co‐2‐acrylamido‐2‐methyl‐1‐propane sulfonic acid) [P(AGA‐co‐APSA)] was synthesized by radical polymerization in an aqueous solution. The water‐soluble polymer, containing secondary amide, hydroxyl, carboxylic, and sulfonic acid groups, was investigated, in view of their metal‐ion‐binding properties, as a polychelatogen with the liquid‐phase polymer‐based retention technique under different experimental conditions. The investigated metal ions were Ag+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+, Pb2+, and Cr3+, and these were studied at pHs 3, 5, and 7. P(AGA‐co‐APSA) showed efficient retention of all metal ions at the pHs studied, with a minimum of 60% for Co(II) at pH 3 and a maximum close to 100% at pH 7 for all metal ions. The maximum retention capacity (n metal ion/n polymer) ranged from 0.22 for Cd2+ to 0.34 for Ag+. The antibacterial activity of Ag+, Cu2+, Zn2+, and Cd2+ polymer–metal complexes was studied, and P(AGA‐co‐APSA)–Cd2+ presented selective antibacterial activity for Staphylococcus aureus with a minimum inhibitory concentration of 2 μg/mL. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009
Electrochemical preparation of pyronin Y thin films on gold substrates
Authors: Alanyalıoğlu Murat , Arık Mustafa 
Published: September 2008

AbstractCyclic voltammetry, chronoamperometry, UV‐vis absorption spectroscopy, fluorescence spectroscopy, FTIR spectroscopy, and AFM techniques have been employed to investigate pyronin Y thin films formed on Au(111) substrates by electrochemical oxidation of pyronin Y monomer. The medium used in the electropolymerization was an anhydrous acetonitrile solution containing 0.1M TBAClO4 as supporting electrolyte. Anodic electropolymerization potential (1450 mV) of pyronin Y has been obtained from cyclic voltammetry data. Solid‐state electropolymerization of pyronin Y was performed by the potential‐controlled electrolysis technique. Chronoamperometry studies indicate that the adsorption of pyronin Y takes place in an instantaneous three‐dimensional nucleation and growth mechanism which is accompanied by random adsorption. UV‐vis absorption and fluorescence spectra of the electrolysis solution as a function of electrodeposition time show the adsorption of insoluble pyronin Y films on Au electrode surface. FTIR‐specular reflectance of a polymer coated Au electrode reveals that there is a possible CC coupling in the formation of polymeric pyronin Y structure. A well ordered polymeric chain structure of pyronin Y on Au(111) has been observed from AFM data. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009
Union production of low chlorinated polyethylene and chlorinated paraffin via a carbon tetrachloride solvent free process
Authors: Tan Kui‐Long , Lu Ying‐Zhou , Sun Ai‐Jun , Li Chun‐Xi , Wang Zi‐Hao 
Published: September 2008

AbstractA novel process for producing low chlorinated polyethylene (LCPE) with chlorinity of 28–33% by weight is presented, in which a reactive solvent, paraffin, is used as a green solvent to replace the commonly used inert solvent, carbon tetrachloride (CTC), an ozone depleting substance (ODS) being phased out under the Montreal Protocol. This process utilizes the principle that paraffin can dissolve high density polyethylene (HDPE) at about 135°C and the resulting solution can be chlorinated by chlorine forming two useful products simultaneously, viz chlorinated paraffin (CP) and LCPE, which are mutual soluble even at lower temperature e.g.70°C. The present process is superior to the conventional CTC solvent method because it can reduce the solvent emission dramatically, enhance the volume efficiency of reactor and achieve a union production of LCPE and CP under atmospheric pressure. The structure and properties of LCPE produced by two different methods are determined by differential scanning calorimetry (DSC), Fourier transform infrared (FTIR) spectrometer, proton magnetic resonance (1H NMR), and gel permeation chromatography (GPC). The results indicate that polyethylene chain can be homogeneously chlorinated in paraffin as in CTC solvent via a radical mechanism, and the chlorinity of CP and LCPE is virtually same under optimal conditions. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009
A proteomics study on human breast cancer cell lines by fluorogenic derivatization–liquid chromatography/tandem mass spectrometry
Authors: Imai Kazuhiro , Ichibangase Tomoko , Saitoh Ryoichi , Hoshikawa Yutaka 
Published: September 2008

AbstractAlthough several molecular markers for human breast cancer exist, their versatility is limited. Here we demonstrate, through a differential proteome analysis utilizing the fluorogenic derivatization–liquid chromatography/tandem mass spectrometry (FD‐LC‐MS/MS) method between seven cancer cells and one normal cell, that the presence of cooperatively expressed annexin‐2 and galectin‐1 without tropomyosin‐1 in a tissue could be used to diagnose metastatic breast cancer. Interestingly, in a metastatic cancer cell, the expression of the former two together with highly expressed cofilin‐1 activates the Rho signal pathway to aggressively form disorganized actin filaments. Despite the excess expression of annexin‐2 and galectin‐1 in the normal cell, the highly expressed tropomyosin‐1 counteracted the activity of cofilin‐1 and stabilized the filaments, resulting in the restoration of the disorganization. This phenomenon suggests that enhancement of tropomyosin‐1 should be used as therapy for metastatic breast cancer. Copyright © 2008 John Wiley & Sons, Ltd.
Cobalt–Lanthanide Coordination Polymers Constructed with Metalloligands: A Ferromagnetic Coupled Quasi‐1D Dy3+ Chain Showing Slow Relaxation
Authors: Huang You‐Gui , Wang Xiu‐Teng , Jiang Fei‐Long , Gao Song , Wu Ming‐Yan , Gao Qiang , Wei Wei , Hong Mao‐Chun 
Published: September 2008

AbstractFour types of cobalt–lanthanide heterometallic compounds based on metalloligand Co(2,5‐pydc)33− (2,5‐H2pydc=pyridine‐2,5‐dicarboxylate acid), [Ln2Co2(2,5‐pydc)6(H2O)4]n ⋅2n H2O (1) (Ln=Tb, Dy for 1 a, 1 b respectively), [Tb2Co2(2,5‐pydc)6(H2O)4]n⋅3n H2O (2), [Tb2Co2(2,5‐pydc)6(H2O)9]n⋅4n H2O (3), and [LaCo(2,5‐pydc)3(H2O)2]n⋅2n H2O (4) have been synthesized. Compound 1 has a layer structure with well‐isolated carboxylate‐bridged Ln3+ chains, compound 2 is a three‐dimensional (3D) porous network with Tb3+ chains that are also well isolated and carboxylate bridged, 3 is a layer structure based on dinuclear units, and 4 is a 3D network with boron nitride (BN) topology. DC magnetic studies reveal ferromagnetic coupling in all the carboxylate‐bridged Ln3+ chains in 1 a, 1 b, and 2. Compared to the silence of the out‐of‐phase ac susceptibility of 2, above 1.9 K the magnetic relaxation behavior of both 1 a and 1 b is slow like that of a single‐chain magnet.
Synthesis, Microwave‐Assisted Polymerization, and Polymer Properties of Fluorinated 2‐Phenyl‐2‐oxazolines: A Systematic Study
Authors: Lobert Matthias , Thijs Hanneke M. L. , Erdmenger Tina , Eckardt Rebecca , Ulbricht Christoph , Hoogenboom Richard , Schubert Ulrich S. 
Published: September 2008

AbstractWe present a detailed systematic study of the synthesis and ability of fluorinated 2‐phenyl‐2‐oxazolines to undergo polymerization. The synthesis of these compounds is based on a two‐step procedure that gives the desired 2‐oxazolines in moderate‐to‐good yields. All the compounds were fully characterized by IR and NMR (1H, 13C, and 19F) spectroscopy, mass spectrometry, and elemental analysis. The 2‐oxazolines were subsequently used as monomers for living cationic ring‐opening polymerization (CROP) with microwave irradiation as the heat source (T=140 °C), nitromethane as the solvent, and methyl tosylate as the initiator. The linear first‐order kinetic plots of the polymerizations accompanied by a linear increase of the molecular weight with conversion and low polydispersity index (PDI) values (generally below 1.30) indicate a living polymerization mechanism. The resulting polymerization rates reflect a strong sensitivity to the quantity of fluorine substituents in general and the presence or absence of ortho‐fluoro substituents of the phenyl ring in particular. All the polymers were isolated and characterized by size‐exclusion chromatography and MALDI‐TOF mass spectrometry. Finally, a detailed investigation of selected polymer properties was performed by using differential scanning calorimetry, thermogravimetric analysis, and contact‐angle measurements, thus resulting in structure–property relationships. Whereas the thermal properties of the polymers are mostly influenced by the presence of ortho‐fluoro substituents, the surface properties are mainly determined by the presence of para‐ and/or meta‐fluoro substituents.
The Synthesis of Azadirachtin: A Potent Insect Antifeedant
Authors: Ley Steven V. , Abad‐Somovilla Antonio , Anderson James C. , Ayats Carles , Bänteli Rolf , Beckmann Edith , Boyer Alistair , Brasca Maria G. , Brice Abigail , Broughton Howard B. , Burke Brenda J. , Cleator Ed , Craig Donald , Denholm Alastair A. , Denton Ross M. , Durand‐Reville Thomas , Gobbi Luca B. , Göbel Michael , Gray Brian Lawrence , Grossmann Robert B. , Gutteridge Claire E. , Hahn Norbert , Harding Sarah L. , Jennens David C. , Jennens Lynn , Lovell Peter J. , Lovell Helen J. , de la Puente Mary L. , Kolb Hartmuth C. , Koot Win‐Jan , Maslen Sarah L. , McCusker Catherine F. , Mattes Amos , Pape Andrew R. , Pinto Andrea , Santafianos Dinos , Scott James S. , Smith Stephen C. , Somers Andrew Q. , Spilling Christopher D. , Stelzer Frank , Toogood Peter L. , Turner Richard M. , Veitch Gemma E. , Wood Anthony , Zumbrunn Cornelia 
Published: September 2008

AbstractWe describe in full the first synthesis of the potent insect antifeedant azadirachtin through a highly convergent approach. An O‐alkylation reaction is used to unite decalin ketone and propargylic mesylate fragments, after which a Claisen rearrangement constructs the central C8C14 bond in a stereoselective fashion. The allene which results from this sequence then enables a second critical carboncarbon bond forming event whereby the [3.2.1] bicyclic system, present in the natural product, is generated via a 5‐exo‐radical cyclisation process. Finally, using knowledge gained through our early studies into the reactivity of the natural product, a series of carefully designed steps completes the synthesis of this challenging molecule.
Solvent‐Mediated Generation of Cobalt‐Cluster‐Stabilised Propargyl Cations and Radicals: Allyl Migration versus Peroxide Formation
Authors: Kaldis John H. , Brook Michael A. , McGlinchey Michael J. 
Published: September 2008

AbstractThe protonation of [Co2(CO)6{9‐[(allyldimethylsilyl)ethynyl]‐9H‐fluoren‐9‐ol}] (4), with HBF4 in CH2Cl2 led to migration of the allyl group from silicon to the cobalt‐stabilised cationic site to furnish [Co2(CO)6{9‐allyl‐9‐[(dimethylfluorosilyl)ethynyl]‐9H‐fluorene}] (17). However, under the same conditions, [Co2(CO)6{9‐[(benzyldimethylsilyl)ethynyl]‐9H‐fluoren‐9‐ol}] (5) underwent desilylation and rearrangement of the resulting terminal alkyne–dicobalt complex to give [Co3(CO)9(9H‐fluorenylmethylcarbynyl)] (24); moreover, dimerisation of the (benzyldimethylsilyl)ethynyl‐9H‐fluorenyl moiety led to the propargyl–allene 26. In contrast, protonation of 5 in THF yielded [{Co2(CO)6{[(benzyldimethylsilyl)ethynyl‐9H‐fluorenyl])}2peroxide] (27) through a radical coupling process. Analogously, protonation of [Co2(CO)6{9‐[(vinyldimethylsilyl)ethynyl]‐9H‐fluoren‐9‐ol}] (6) yields the corresponding peroxide 28. X‐ray crystallographic data are reported for, among others, complexes 17, 24, 26, 27 and 28.
ChemInform Abstract: Crystal Structure and Thermal Expansion Studies of α‐VO(PO3)2.
Authors: Achary S. N. , Patwe S. J. , Tyagi A. K. 
Published: September 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Ln(Zr1/3Ti2/3)TaO6 (Ln: Ce, Pr, Nd and Eu): A Novel Group of Microwave Ceramics.
Authors: Solomon Sam , Kumar H. Padma , Jacob Lovely , Thomas J. K. , Varma Manoj Raama 
Published: September 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Synthesis of Nanocrystalline Zr(B1‐xNx) by Mechanical Alloying.
Authors: Lu C. J. , Li Z. Q. 
Published: September 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: [1,2‐P2S8]2‐ — A New Member of the Thiophosphate Family: Synthesis, Crystal Structure and Vibrational Spectrum of [NH4(2.2.2‐cryptand)]2 [1,2‐P2S8] and [NH4(18‐crown‐6)]2 [1,2‐P2S8]×H2O.
Authors: Gjikaj Mimoza , Wu Peng 
Published: September 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Ba4Cr2US9: The First Chalcogenide Analogue of the Perovskite‐Related (A3A′BO6)m (A3B3O9)n Family.
Authors: Yao Jiyong , Ibers James A. 
Published: September 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Chiral Pyranoside Phosphite—Oxazolines: A New Class of Ligand for Asymmetric Catalytic Hydrogenation of Alkenes.
Authors: Dieguez Montserrat , Mazuela Javier , Pamies Oscar , Verendel J. Johan , Andersson Pher G. 
Published: September 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Diastereoselective Nickel‐Catalyzed Reductive Aldol Cyclizations Using Diethylzinc as the Stoichiometric Reductant: Scope and Mechanistic Insight.
Authors: Joensuu Pekka M. , Murray Gordon J. , Fordyce Euan A. F. , Luebbers Thomas , Lam Hon Wai 
Published: September 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Zn(II)‐Catalyzed Desymmetrization of meso‐Epoxides by Aromatic Amines in Water.
Authors: Bonollo Simona , Fringuelli Francesco , Pizzo Ferdinando , Vaccaro Luigi 
Published: September 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Enantioselective Diethylzinc Addition to Aldehydes Catalyzed by Novel L‐Arabinose Derived Amino Alcohols.
Authors: Bauer T. , Bielecka M. 
Published: September 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Scandium(III) Fluoride as a Novel Catalyst for Hydroxymethylation of Dimethylsilyl Enolates in Aqueous Media.
Authors: Kokubo Masaya , Kobayashi Shu 
Published: September 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: A Cascade Palladium‐Mediated Cross‐Coupling/Electrocyclization Approach to the Construction of Fused Bi‐ and Tricyclic Rings.
Authors: Kan S. B. Jennifer , Anderson Edward A. 
Published: September 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Michael Adducts — Sources for Biologically Potent Heterocycles.
Authors: Padmaja Adivireddy , Reddy Gali Sudhakar , Mohan Annaji Venkata Nagendra , Padmavathi Venkatapuram 
Published: September 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Alumina‐Supported Molybdenum(VI) Oxide: An Efficient and Recyclable Heterogeneous Catalyst for Regioselective Ring Opening of Epoxides with Thiols, Acetic Anhydride, and Alcohols under Solvent‐Free Conditions.
Authors: Singhal Sweety , Jain Suman L. , Sain Bir 
Published: September 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Aromatic Dianionic Oxy‐Cope Rearrangement of 1,2‐Dinaphthyl‐1,2‐diols of Acyclic Diketones.
Authors: Hussaini Syed Sulaiman , Huq C. A. M. A. 
Published: September 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Reactions of 5‐Aryl‐3‐arylmethylene Substituted 3H‐Furan‐2‐ones and 3H‐Pyrrol‐2‐ones with Acetoacetic Ester.
Authors: Anis'kova Tatyana V. , Yegorova Alevtina Yu. , Chadina Valeriya V. 
Published: September 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Halogenation of Ketones with N‐Halosuccinimides under Solvent‐Free Reaction Conditions.
Authors: Pravst Igor , Zupan Marko , Stavber Stojan 
Published: September 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Development of a Tandem Base‐Catalyzed, Triphenylphosphine‐Mediated Disulfide Reduction—Michael Addition.
Authors: Bartolozzi Alessandra , Foudoulakis Hope M. , Cole Bridget M. 
Published: September 2008

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 of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.