bluuebunny/crossref_metadata_2025_split huggingface dataset:
The role of aggression and social competence in children's perceptions of the child–teacher relationship
Authors: Blankemeyer Maureen , Flannery Daniel J. , Vazsonyi Alexander T. 
Published: August 2002

AbstractThe role of children's aggression and three indices of social competence (peer‐preferred behavior, teacher‐preferred behavior, and school adjustment) in children's perceived relationships with their teachers was assessed. Participants were 1,432 third through fifth graders (688 males, 744 females) and their teachers. The results from hierarchical regression analyses showed statistically significant interaction effects. Poor school adjustment was associated with more negatively perceived child teacher relationships for boys than for girls. In addition, the perceived child–teacher relationship among aggressive children was more favorable among those with high levels of school adjustment than among those who were poorly adjusted at school. Implications for school psychologists and teachers are discussed. © 2002 John Wiley & Sons, Inc.
A national survey of current supervision and evaluation practices of school psychologists
Authors: Chafouleas Sandra M. , Clonan Sheila M. , Vanauken Tracy L. 
Published: August 2002

AbstractThis paper presents findings from a national survey of school psychologists regarding current supervision and evaluation practices. Thirty‐seven percent of usable surveys were returned. Overall results suggested that the sample of school psychologists were somewhat to moderately satisfied with current supervision and evaluation practices. However, wide variation in how supervision, evaluation, and professional development are obtained was indicated. The evaluation process is most often conducted by an administrator who may not be familiar with school psychology; and it is not viewed as an opportunity for professional development. In addition, evaluation criteria often are not tailored specifically to the roles of the school psychologist. Most alarming, and consistent with previous research, is that many school psychologists do not have enough supervision available to meet either their wishes or standards for the profession. Higher satisfaction with supervision was found when participants were provided with more regular and formal supervision contacts. Participants also indicated a person knowledgeable about school psychology could best provide supervision. Implications of the results and future directions are discussed. © 2002 Wiley Periodicals, Inc.
Assessment of violence potential among school children: Beyond profiling
Authors: Burns Matthew K. , Dean Vincent J. , Jacob‐Timm Susan 
Published: August 2002

AbstractThe increasing level of public attention to violence in American schools makes the issue a top priority among educators. School psychologists could play an important role in identifying at‐risk youth, and planning appropriate individual, school, and community interventions related to school violence. However, there is limited literature examining different assessment approaches that could be used to evaluate student risk for violence. This article reviews (a) characteristics of students “at risk” for violence, (b) informal checklists and matching student characteristics to profiles of typical violent students and (c) threat assessment based on Borum et al.'s (1999) model. Ethical and legal considerations are covered as well. © 2001 John Wiley & Sons. Inc.
Revision of the structure and stereochemistry of the 2‐naphthol–acetaldehyde 2:2 condensation product. A study by X‐ray crystallography and the AM1 method
Authors: Rashidi‐Ranjbar Parviz , Mohajeri Ali , Hossein Mahmoudkhani Amir 
Published: August 2002

AbstractThe structure of the 2:2 condensation product of 2‐naphthol and acetaldehyde, 1‐(1‐methyl‐2,3‐dihydro‐1H‐benzo[ f ]chromen‐3‐yl)‐2‐naphthol, revised by X‐ray crystallography, is presented. A moderate intramolecular hydrogen bond is found between the phenolic OH and chromene oxygen atom both in the solid state and in solution. In the crystal structure, the naphthyl groups are oriented in parallel with a π–π stacking distance of 354 pm. AM1 studies are used to explain the formation of one of the four possible stereoisomers for the title compound. Comparison of the experimental and calculated coupling constants indicates that the molecule adopts exclusively the solid‐state structure in solution. Copyright © 2001 John Wiley & Sons, Ltd.
Ab initio study of the structures of CH3NH3+ and CH3PH3+ in aqueous solution
Authors: Masamura M 
Published: August 2002

AbstractThe purpose of this work was to determine quantitatively the structures of CH3NH3+ and CH3PH3+ in aqueous solution. For this purpose, the structures of CH3NH3+ (H2O)
n were optimized using MP2/6–31G(d) (n = 0, 1, 2, 3, 4, 5, 6) and RHF/4–31G (n = 0, 1, 2, 3, 4, 5, 6, 9, 21) and the structures of CH3PH3+ (H2O)
n (n = 0, 1, 2, 3) were optimized using MP2/6–31+G(d,p). Based on these structures, the structure of CH3NH3+ in aqueous solution was predicted as follows: C—N = 1.479 Å, N—H = 1.047 Å, C—H = 1.088 Å, NCH = 108.9° and CNH = 108.5°. The C—N bond length of CH3NH3+ in aqueous solution is predicted to be smaller than that in the gas phase by 0.03 Å. The N—H bond lengths of CH3NH3+ in aqueous solution are predicted to be longer than those in the gas phase by 0.02 Å. The structure of CH3PH3+ in aqueous solution was predicted as follows: C—P = 1.808 Å, P—H = 1.394 Å, C—H = 1.087 Å, PCH = 109.5° and CPH = 109.9°. The structure of CH3PH3+ in aqueous solution is predicted to be similar to that in the gas phase. Copyright © 2001 John Wiley & Sons, Ltd.
Substituent effect on the cationic ring‐opening polymerization of acyloxymethyl five‐member cyclic dithiocarbonates
Authors: Steblyanko Alexander , Choi Wonmun , Sanda Fumio , Endo Takeshi 
Published: August 2002

AbstractFive‐member cyclic dithiocarbonates were synthesized by the reactions of carbon disulfide with benzoic, p‐anisic, p‐chlorobenzoic, 1‐naphthalenecarboxylic, p‐nitrobenzoic, and p‐(tert‐butyl)benzoic glycidyl esters, and their cationic ring‐opening polymerizations were carried out with methyl trifluoromethane sulfonate and trifluoromethane sulfonic acid as initiators at room temperature to 80 °C. Polymers with number‐average molecular weights of 3400–24,900 were obtained in high yields, and their structures were estimated by NMR and IR spectroscopy. The monomers showed a clear difference in the polymerization rate according to the substituents. The rate of polymerization decreased in the order of p‐chlorobenzoic ≥ benzoic > 1‐naphthalenecarboxylic > p‐nitro‐benzoic > p‐tert‐butylbenzoic > p‐anisic. The data of the reaction kinetics, NMR studies, and molecular orbital calculations proved a plausible mechanism involving the participation of p‐substituted benzoyloxymethyl groups to stabilize the cationic propagating end. The polymers showed decomposition temperatures with 5% weight loss ranging from 200 to 260 °C. No glass‐transition temperatures for the polymers were observed below 200 °C by differential scanning calorimetry. © 2001 John Wiley & Sons, Inc. J Polym Sci Part A: Polym Chem 39: 3967–3980, 2001
Photosensitive, self‐assembled ultrathin films based on diazoresin and phosphate‐containing polyanions
Authors: Li Qi , Ouyang Jianhua , Chen Jinyu , Zhao Xinsheng , Cao Weixiao 
Published: August 2002

AbstractPhotosensitive ultrathin films with phosphate‐containing polyanions and diazoresin (DR) as a polycation were fabricated with a self‐assembly technique. The phosphate‐containing polyanions were poly(sodium phosphate), phosphorylated poly(vinyl alcohol), and DNA. The fabrication process was monitored by the determination of the absorbance from DR. The surface morphology of the multilayer films was observed with atomic force microscopy. Under ultraviolet irradiation, the linkage between the layers of the films changed from being ionic to being covalent; as a result, the stability of the films toward polar solvents increased. This kind of film may have applications for biosensor devices. © 2001 John Wiley & Sons, Inc. J Polym Sci Part A: Polym Chem 40: 222–228, 2002
New positive‐type photosensitive polymer based on poly(2,6‐dihydroxy‐1,5‐naphthylene) and diazonaphthoquinone
Authors: Sasada Yasuyuki , Shibasaki Yuji , Suzuki Masato , Ueda Mitsuru 
Published: August 2002

AbstractA positive working photosensitive polymer based on poly(2,6‐dihydroxy‐1,5‐naphthylene) (PDHN) with 1‐(1,1‐bis{4‐[2‐diazo‐1(2H)naphthalene‐5‐sulfonyloxy]phenyl}ethyl)‐4‐(1‐{4‐[2‐diazo‐1(2H)naphthalene‐5‐sulfonyloxy]phenyl}methylethyl) benzene (S‐DNQ) as a photosensitive compound has been developed. PDHN (number‐average molecular weight: 13,000; polydispersity index: 1.9) was prepared by oxidative coupling polymerization of the 2,6‐dihydroxynaphthalene‐benzylamine complex using iron(III) chloride hexahydrate in the solid state. A 10 wt % loss temperature of PDHN was 450 °C in air, and the film of 1 μm thickness showed excellent transparency above 400 nm. The resist system consisting of PDHN and S‐DNQ gave a clear positive pattern when it was exposed to 436 nm of light, followed by development with a 0.50 wt % aqueous tetramethylammonium hydroxide solution at 25 °C. The sensitivity (D) and contrast (γ) were 300 mJ/cm2 and 2.1, respectively. © 2001 John Wiley & Sons, Inc. J Polym Sci Part A: Polym Chem 40: 393–398, 2002
Preparation and emission properties of various poly(dimethylsilylenearylenevinylene)s: Effects of geometric structures and π units on their emission properties
Authors: Kwak Giseop , Masuda Toshio 
Published: August 2002

Abstracttrans‐Poly(dimethylsilylenearylenevinylene)s (trans‐rich) and cis‐poly(dimethylsilylenearylenevinylene)s (cis‐rich) containing phenylene, biphenylene, and phenylenesilylenephenylene units were prepared by hydrosilylation catalyzed with the RhI(PPh3)3 complex. The addition of a phenylene π unit to poly(silylenephenylenevinylene) expanded the conjugation in the main chain, whereas the insertion of a dimethylsilylene σ unit in the biphenylene moiety reduced the conjugation. UV spectra of the trans‐type polymers showed redshifts and hyperchromic effects with respect to those of the cis‐type polymers, indicating wider conjugation, and the quantum yields of emission of the former polymers were much higher than those of the latter polymers. The quantum yield of the trans‐rich polymer with the biphenylene moiety reached 0.15, which was about 102 times as large as those of trans‐type polymers with phenylene (3.4 × 10−3) and phenylenesilylenephenylene (1.9 × 10−3) moieties. The effects of the geometric structure and π unit on the absorption and emission properties of these polymers were examined with molecular orbital methods. © 2002 John Wiley & Sons, Inc. J Polym Sci Part A: Polym Chem 40: 535–543, 2002; DOI 10.1002/pola.10139
Synthesis of amphiphilic block–graft copolymers [poly(styrene‐b‐ethylene‐co‐butylene‐b‐styrene)‐g‐poly(acrylic acid)] and their aggregation in water
Authors: Ning Fanglin , Jiang Ming , Mu Minfang , Duan Hongwei , Xie Jingwei 
Published: August 2002

AbstractNovel block–graft copolymers [poly(styrene‐b‐ethylene‐co‐butylene‐b‐styrene)‐g‐poly(tert‐butyl acrylate)] were synthesized by the atom transfer radical polymerization (ATRP) of tert‐butyl acrylate (tBA) with chloromethylated poly(styrene‐b‐ethylene‐co‐butylene‐b‐styrene) (SEBS) as a macromolecular initiator. The copolymers were composed of triblock SEBS as the backbone and tBA as grafts attached to the polystyrene end blocks. The macromolecular initiator (chloromethylated SEBS) was prepared by successive hydrogenation and chloromethylation of SEBS. The degree of chloromethylation, ranging from 1.6 to 36.5 mol % according to the styrene units in SEBS, was attained with adjustments in the amount of SnCl4 and the reaction time with a slight effect on the monodispersity of the starting material (SEBS). The ATRP mechanism of the copolymerization was supported by the kinetic data and the linear increase in the molecular weights of the products with conversion. The graft density was controlled with changes in the functionality of the chloromethylated SEBS. The average length of the graft chain, ranging from a few repeat units to about two hundred, was adjusted with changes in the reaction time and alterations in the initiator/catalyst/ligand molar ratio. Incomplete initiation was detected at a low conversion; moreover, for initiators with low functionality, sluggish initiation was overcome with suitable reaction conditions. The block–graft copolymers were hydrolyzed into amphiphilic ones containing poly(acrylic acid) grafts. The aggregation behavior of the amphiphilic copolymers was studied with dynamic light scattering and transmission electron microscopy, and the aggregates showed a variety of morphologies. © 2002 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 40: 1253–1266, 2002
Synthesis and characterization of organosoluble polyimides with trifluoromethyl‐substituted benzene in the side chain
Authors: Liu J. G. , He M. H. , Li Z. X. , Qian Z. G. , Wang F. S. , Yang S. Y. 
Published: August 2002

AbstractNew aromatic diamines substituted with a trifluoromethyl group in the side chain, 2,4‐diamino‐3′‐trifluoromethylazobenzene, 2,4‐diamino‐1‐[(4′‐trifluoromethylphenoxy) phenyl] aniline, and 3,5‐diamino‐1‐[(4′‐trifluoromethyl phenoxy) phenyl] benzamide were synthesized and characterized and used to prepare polyimides by a one‐step high‐temperature polycondensation method. Experimental results indicated that the prepared polyimides possess good solubility in strong organic solvents such as N‐methyl‐2‐pyrrolidinone, N,N′‐dimethylformamide, and N,N′‐dimethylacetamide. Homogeneous solutions with solid contents as high as 15–20% can be prepared, which are stable for storing longer than 2 weeks at room temperature. The polyimides exhibited glass‐transition temperatures of 249–292 °C and good thermal stability. The PI‐Ic and PI‐IIIc films prepared by casting the fully imidized polymer solutions showed good transparency with cutoff wavelengths at 320–330 nm. © 2002 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 40: 1572–1582, 2002
Polymerization of methyl methacrylate and other polar monomers with alkylaluminum initiators bearing bidentate and tridentate N‐ and O‐donor ligands
Authors: Baugh Lisa Saunders , Sissano Joseph A. 
Published: August 2002

AbstractDimethylaluminum complexes bearing bidentate amidate, oxypyridine, and salicylaldimine N,O‐ligands and tridentate N,N′,N″‐pyridyliminoamide ligands were synthesized and spectroscopically characterized. The complexes were investigated in both neutral and borane‐activated cationic forms, along with bidentate N,N′‐ligated aluminum amidinates, as catalysts for the polymerization of methyl methacrylate, ϵ‐caprolactone, and propylene oxide. The neutral complexes generally did not carry out polymerization, but the polymerization/oligomerization of all three monomers was achieved when the various catalysts were activated with B(C6F5)3 or [Ph3C]+[B(C6F5)4]−. The N,O‐ligated cations were much less active for polymerization than the analogous, more stable N,N′‐ligated amidinate cations; both types of cationic complexes catalyzed the ring‐opening cationic polymerization of tetrahydrofuran. B(C6F5)3 and [Ph3C]+[B(C6F5)4]− also independently carried out the oligomerization of propylene oxide. © 2002 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 40: 1633–1651, 2002
Synthesis and characterization of new highly organosoluble poly(etherimide)s derived from 1,1‐bis{4‐[4‐(3,4‐dicarboxyphenoxy)phenyl]‐4‐phenylcyclohexane} dianhydride
Authors: Liaw Der‐Jang , Hsu Chung‐Yu , Hsu Pei‐Nan , Lin Shu‐Ling 
Published: August 2002

AbstractA new bulky pendent bis(ether anhydride), 1,1‐bis[4‐(4‐dicarboxyphenoxy)phenyl]‐4‐phenylcyclohexane dianhydride, was prepared in three steps, starting from the nitrodisplacement of 1,1‐bis(4‐hydroxyphenyl)‐4‐phenylcyclohexane with 4‐nitrophthalonitrile to form bis(ether dinitrile), followed by alkaline hydrolysis of the bis(ether dinitrile) and subsequent dehydration of the resulting bis(ether diacid). A series of new poly(ether imide)s were prepared from the bis(ether anhydride) with various diamines by a conventional two‐stage synthesis including polyaddition and subsequent chemical cyclodehydration. The resulting poly(ether imide)s had inherent viscosities of 0.50–0.73 dL g−1. The gel permeation chromatography measurements revealed that the polymers had number‐average and weight‐average molecular weights of up to 57,000 and 130,000, respectively. All the polymers showed typical amorphous diffraction patterns. All of the poly(ether imide)s showed excellent solubility in comparison with the other polyimides derived from adamantane, norbornane, cyclododecane, and methanohexahydroindane and were readily dissolved in various solvents such as N‐methyl‐2‐pyrrolidinone, N,N‐dimethylacetamide (DMAc), N,N‐dimethylformamide, pyridine, cyclohexanone, tetrahydrofuran, and even chloroform. These polymers had glass‐transition temperatures of 226–255 °C. Most of the polymers could be dissolved in chloroform in as high as a 30 wt % concentration. Thermogravimetric analysis showed that all polymers were stable up to 450 °C, with 10% weight losses recorded from 458 to 497 °C in nitrogen. These transparent, tough, and flexible polymer films could be obtained by solution casting from DMAc solutions. These polymer films had tensile strengths of 79–103 MPa and tensile moduli of 1.5–2.1 GPa. © 2002 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 40: 2066–2074, 2002
Influence of stereochemistry on the thermal properties of partially cycloaliphatic polyamides
Authors: Vanhaecht Bert , Rimez Bart , Willem Rudolph , Biesemans Monique , Koning Cor E. 
Published: August 2002

AbstractThe effects of the partial substitution of 1,4‐disubstituted cyclohexane monomers for linear aliphatic monomers in polyamides are discussed. More specifically, the relation between the stereochemistry of the cycloaliphatic residues and the thermal properties [melting temperature (Tm) and crystallization temperature (Tcr)] was investigated. For this purpose, two different types of copolyamides were synthesized: in polyamides 12.6, the adipic acid residues were partially replaced by cis/trans‐1,4‐cyclohexanedicarboxylic acid (1,4‐CHDA), whereas in polyamides 4.14, the 1,4‐diaminobutane residues were partially substituted with cis/trans‐1,4‐diaminocyclohexane (1,4‐DACH). For both systems, increasing the degree of substitution of cycloaliphatic residues for linear aliphatic residues resulted in a rise of both Tm and Tcr. This points to the isomorphous crystallization of the linear and cycloaliphatic residues. In contrast to the use of 1,4‐DACH as a comonomer, 1,4‐CHDA residues showed isomerization upon thermal treatment of the polyamides. This isomerization of the cyclohexane residues influenced the thermal properties of the copolyamides. The use of a nonisomerizing cis–trans mixture of 1,4‐DACH exhibited the large influence of the stereochemistry of the cycloaliphatic residues on the Tm of the copolyamides. For both the 1,4‐CHDA‐ and 1,4‐DACH‐based copolyamides, differential scanning calorimetry analysis revealed that recrystallization occurs during melting. This exothermal effect becomes less pronounced with an increasing content of rigid cycloaliphatic residues. © 2002 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 40: 1962–1971, 2002
Synthesis of thermosensitive hydrogels from acryloyloxyethyl trialkyl phosphonium chloride–N‐isopropylacrylamide–N,N′‐methylenebisacrylamide terpolymers and their temperature dependence of water absorption
Authors: Watanabe Tsutomu , Utsunomiya Masayuki , Kurihara Seiji , Nonaka Takamasa 
Published: August 2002

AbstractThermosensitive polymer hydrogels were prepared by the copolymerization of three kinds of acryloyloxyethyl trialkyl phosphonium chlorides (AETRs) with alkyl chains of different lengths, with N‐isopropyl acrylamide (NIPAAm) and N,N′‐methylenebisacrylamide (MBAAm). The water content of the AETR–NIPAAm–MBAAm terpolymers obtained at molar ratios of the crosslinking agent greater than 2 decreased with increasing temperature and decreased sharply around 35 °C. However, the water contents of the AETR–NIPAAm–MBAAm (X/100/1) terpolymers obtained at a molar ratio of 1 of the crosslinking agent increased once with increasing temperature and then decreased from 3 to around 40 °C. The water contents of the AETR–NIPAAm–MBAAm (3/100/1 or 2) terpolymers decreased with the increasing length of alkyl chains in phosphonium groups in the terpolymers. The water contents of the AETR–NIPAAm–MBAAm terpolymers increased by the addition of a small amount of urea and then decreased with increasing urea concentration. However, the water contents decreased abruptly with the addition of NaCl. The AETR–NIPAAm–MBAAm terpolymers exhibited high adsorption for sodium dodecylbenzene sulfonate but no adsorption for sodium benzene sulfonate. © 2001 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 39: 1505–1514, 2001
Synthesis and properties of alternating copolyamide‐imides based on 2,6‐bis(4‐aminophenoxy)naphthalene and comparison with its related isomeric polymers
Authors: Yang Chin‐Ping , Yang Chun‐Cheng , Chen Ruei‐Shin 
Published: August 2002

AbstractA series of novel polyamide‐imides III containing 2,6‐bis(phenoxy)naphthalene units were synthesized by 2,6‐bis(4‐aminophenoxy)naphthalene and various bis(trimellitimide)s in N‐methyl‐2‐pyrrolidone (NMP) using triphenyl phosphite and pyridine as condensing agents through direct polycondensation. The polymers were obtained in quantitative yield with inherent viscosities up to 1.53 dL/g. Most of the polymers showed good solubility in NMP, N,N‐dimethylacetamide, N,N‐dimethylformamide, and dimethyl sulfoxide and could be solution‐cast into transparent, flexible, and tough films. The films had tensile strengths of 84–111 MPa, elongations at break of 8–33%, and initial moduli of 2.2–2.8 GPa. Wide‐angle X‐ray diffraction revealed that most polymers III were amorphous. The glass‐transition temperatures of some of the polymers could be determined by differential scanning calorimetry traces, recorded at 247–290 °C. The polyamide‐imides exhibited excellent thermal stabilities and had 10% weight loss at temperatures in the range of 501–575 °C under nitrogen atmosphere. They left more than 57% residue even at 800 °C in nitrogen. A comparative study of some corresponding polyamide‐imides is also presented. © 2001 John Wiley & Sons, Inc. J Polym Sci Part A: Polym Chem 39: 2591–2601, 2001
Synthesis and properties of vinyl‐terminated and silicon‐containing polysulfones and polyketones
Authors: Kim Sang Hern , Woo Hee‐Gweon , Kim Joon‐Seop , Lee Hyun‐Woo , Kim Whan‐Gi 
Published: August 2002

Abstract4‐Fluorophenylsulfonylphenyl‐terminated polysulfone and 4‐fluorobenzoylphenyl ketone were prepared with bisphenol A and an excess of bis‐(4‐fluorophenyl)sulfone or 4,4′‐difluorobenzophenone, respectively, at 160 °C using potassium carbonate in N,N‐dimethylacetamide. The resulting polymers were reacted with 4‐hydroxystyrene to synthesize vinyl‐terminated polysulfones and ketones. The silicon‐containing polysulfones and ketones were prepared from the vinyl‐terminated polymer precursor and various H‐functional silanes or siloxanes. The synthesis of silicon‐containing polymers was achieved by hydrosilation with a rhodium catalyst. It was shown that the hydrosilation reaction proceeds with 55:45 chemoselectivity. The resulting polymers were investigated by 1H NMR spectroscopy, DSC, and thermogravimetric analysis. © 2001 John Wiley & Sons, Inc. J Polym Sci Part A: Polym Chem 39: 2937–2942, 2001