摘要:

Abstract2(2‐Hydroxy‐5‐isopropenylphenyl)2H‐benzotriazole was synthesized in 40% overall yield starting fromo‐nitroaniline. Diazotization in aqueous hydrochloric acid gaveo‐nitrophenyl diazonium chloride which was condensed withp‐hydroxyacetophenone; the azo compound was reduced to 2(2‐hydroxy‐5‐acetylphenyl) 2H‐benzotriazole with zinc powder in sodium hydroxide solution and the 2‐hydroxy group of the compound was acetylated. Treatment of the acetyl compound with methyl Grignard reagent resulted in the methylation of the 5‐acetyl group to 2[2‐acetoxy‐5(2‐hydroxy‐2‐propyl)phenyl]2H‐benzotriazole which was then dehydrated with potassium hydrogen sulfate to the desired 2(2‐hydroxy‐5‐isopropenylphenyl)2H‐benzotriazole. This monomer did not homopolymerize, but was copolymerized readily with styrene, methyl methacrylate, andn‐butyl acrylate with azobisisobutyronitrile as the initiator. 2(2‐Acetoxy‐5‐acetylphenyl)2H‐benzotriazole was also reduced with sodium borohydride to form 2[2‐acetoxy‐5‐(1‐hydroxyethyl)phenyl]2H‐benzotriazole which was dehydrated and hydrolyzed to the known 2(2‐hydroxy‐5‐vinylphenyl)‐2H‐benzotriazole. This route provides

ISSN:0360-6376    

DOI:10.1002/pol.1982.170201001

出版商:John Wiley&Sons, Inc.    

年代:1982

数据来源: WILEY

摘要:

AbstractPhotopolymerization of styrene was carried out in a dispersed system to obtain 10 μm particles, usingd‐t‐butylperoxide as initiator and poly(vinyl alcohol) as protective colloid. It was shown that particles typical for latex polymerization are also formed and interfere with the dispersion polymerization when excess protective colloid is

ISSN:0360-6376    

DOI:10.1002/pol.1982.170201002

出版商:John Wiley&Sons, Inc.    

年代:1982

数据来源: WILEY

摘要:

AbstractCharge transfer (CT) interaction is described in semiconducting dispersions of TCNQ complex salt\documentclass{article}\pagestyle{empty}\begin{document}$ {\rm Et}_3 {\rm NH}^+ ({\rm TCNQ})_2^{\cdot^{\hskip-3.7pt\hbox{--}}}$\end{document}with and without added TCNQ°, in poly(vinyl acetal) matrices in which the electron‐donor moiety is varied. The extent of CT interaction was determined in films and in solution (DMF, acetonitrile, or methylene chloride) through the absorbances at 398 nm (\documentclass{article}\pagestyle{empty}\begin{document}$ {\rm TCNQ}{\ }^{\cdot^{\hskip-3.7pt\hbox{--}}}$\end{document}and TCNQ°) and 857 nm\documentclass{article}\pagestyle{empty}\begin{document}$ {\rm TCNQ}{\ }^{\cdot^{\hskip-3.7pt\hbox{--}}}$\end{document}. Resistivity of the conductive films was related to the stoichiometry of TCNQ species in the films and found to have a minimum at\documentclass{article}\pagestyle{empty}\begin{document}$[{\rm TCNQ}^\circ]/[{\rm TCNQ}{\ }^{\cdot^{\hskip-3.7pt\hbox{--}}}]\simeq 1$\end{document}. Lower resistivities were attained with films having a uniform, densely packed dispersion of microcrystallites which were obtained at a relatively slow solvent removal rate. With this particular complex salt, strong electron‐donor polymers are found to be better matrices for semiconduct

ISSN:0360-6376    

DOI:10.1002/pol.1982.170201003

出版商:John Wiley&Sons, Inc.    

年代:1982

数据来源: WILEY

摘要:

AbstractPoly(metal phthalocyanine)imides of copper, cobalt, nickel, and zinc were synthesized by the reaction of metal phthalocyanino tetramines with benzophenone tetracarboxylic dianhydride. These polymers were characterized by elemental analyses and IR, TGA, and inherent viscosity studies. Noteworthy features of these phthalocyanine polymers are their remarkable thermal and thermooxidative stabilities with char yields at 800°C that range from 78 to 83% in a nitrogen atmosphere. The relative thermal stabilities of these polymers have been evaluated by activation energy measurements

ISSN:0360-6376    

DOI:10.1002/pol.1982.170201004

出版商:John Wiley&Sons, Inc.    

年代:1982

数据来源: WILEY

摘要:

AbstractNew poly(metal phthalocyanine) pyromellitimides of copper, cobalt, nickel, and zinc were synthesized and elemental, IR, TGA, and inherent viscosity measurement studies were done to characterize these polymers. They showed exceptional thermal and thermo‐oxidative stability with char yields at 800°C ranging from 75 to 87% in a nitrogen atmosphere. The ratio of the polymer decomposition temperatures in air and nitrogen (PDT) (air)/PDT (N2) varied from 0.91 to 0.97, which indicated that the onset of degradation of these polymers is greatly affected by the presence of an oxidizing atmosphere. Isothermal studies were done to evaluate the long‐term thermal stability of these poly

ISSN:0360-6376    

DOI:10.1002/pol.1982.170201005

出版商:John Wiley&Sons, Inc.    

年代:1982

数据来源: WILEY

摘要:

AbstractAlternating copolyamides of various ω‐amino acids were synthesized by base‐catalyzed polycondensation ofN‐isothiocyanatoacyl ω‐amino acids in solution. Derivatives of the following amino acids were used: glycine, β‐alanine, γ‐aminobutyric acid, δ‐aminovaleric acid, ε‐aminocaproic acid,D,L‐β‐aminobutyric acid,trans‐4‐aminocyclohexane 1‐carboxylic acid, 4‐aminophenyl acetic acid, 3‐aminobenzoic acid, 4‐aminobenzoic acid, 3‐amino‐4‐methyl benzoic acid, and 4‐amino‐3‐methyl benzoic acid. The base‐catalyzed polycondensation at lower temperatures gave purer products than the bulk condensation at 180–200°C.13C‐NMR and natural‐abundance15N‐NMR spectra measured in trifluoroacetic acid demonstrate that in most cases undisturbed alternating sequences were obtained. Strong neighboring residue effects and long‐range sequence effects were found in the15N‐NMR spectra, and structure/shift relationships are discussed. The sequences of copolyamides obtained by copolymerizations of lactams or β‐amino acidN‐carboxyanhydrides were investigated by both15N‐NMR and13C‐NMR spectroscopy.13C‐NMR spectroscopy was found to be more useful if the copolyamides consist of ω‐amino acid units of different chain length. However,15N‐NMR spectros

ISSN:0360-6376    

DOI:10.1002/pol.1982.170201006

出版商:John Wiley&Sons, Inc.    

年代:1982

数据来源: WILEY

摘要:

AbstractThis article concerns the synthesis and characterization of new epoxy and aldehyde telechelic polyisobutylenes, that is,and . The synthesis of the epoxy derivative was achieved by quantitative epoxidation of α,ω‐di(isobutenyl) polyisobutylene withm‐chloroperoxybenzoic acid and that of the dialdehyde by quantitative isomerization of the epoxy termini with zinc bromide. Infrared (IR) and1H‐NMR analysis of these new telechelic polymers and ultraviolet (UV) analysis of the 2,4‐dinitrophenylhydrazine derivative of the dialdehyde indicate quantitative conversions and yields, that is, essentially theoretical functionalization (Fn= 1.9

ISSN:0360-6376    

DOI:10.1002/pol.1982.170201007

出版商:John Wiley&Sons, Inc.    

年代:1982

数据来源: WILEY

摘要:

AbstractThe kinetics of α‐methylene‐γ‐butyrolactone (α‐MBL) homopolymerization was investigated inN,N‐dimethylformamide (DMF) with azobis(isobutyronitrile) as initiator. The rate of polymerization (Rp) was expresed byRp=k[AIBN]0.54[α‐MBL]1.1and the overall activation energy was calculated as 76.1 kJ/mol. Kinetic constants for α‐MBL polymerization were obtained as follows:kp/kt1/2= 0.161 L1/2mol−1/2·s−1/2; 2fkd= 2.18 × 10−5s−1. The relative reactivity ratios of α‐MBL(M2) copolymerization with styrene (r1= 0.14,r2= 0.87) were obtained. Applying theQ–escheme led toQ= 2.2 ande= 0.65. TheseQandevalues for

ISSN:0360-6376    

DOI:10.1002/pol.1982.170201008

出版商:John Wiley&Sons, Inc.    

年代:1982

数据来源: WILEY

摘要:

AbstractThe kinetics of methacryloyl fluoride (MAF) homopolymerization was investigated in methyl ethyl ketone (MEK) with azobis(isobutyronitrile) as initiator. The rate of polymerization (Rp) followed the expressionRp=k[AIBN]0.55[MAF]1.18. The overall activation energy was calculated as 74.4 kJ/mol. The relative reactivity ratios of MAF(M2) copolymerization with styrene (r1= 0.083,r2= 0.14), and methyl methacrylate (r1= 0.48,r2= 0.81) in methyl ethyl ketone were obtained. Application of theQ–escheme (in styrene copolymerization) led toQ= 2.22 ande= 1.31. The glass transition temperature (Tg) of poly(MAF) was 90°C by thermomechanical analysis. Thermogravimetry of poly(MAF) showed a 10% weight loss of 228°C in

ISSN:0360-6376    

DOI:10.1002/pol.1982.170201009

出版商:John Wiley&Sons, Inc.    

年代:1982

数据来源: WILEY

摘要:

Abstract(2‐Chloroethyl)oxirane, (3‐chloropropyl)oxirane, and (4‐chlorobutyl)oxirane were prepared from the corresponding alkenols and polymerized using a triethylaluminum‐water‐acetylacetone initiator system. Copolymerizations with propylene oxide and epichlorohydrin were also accomplished; the copolymerization activities of the (chloroalkyl)oxiranes were similar to the activity of epichlorohydrin. Poly[(2‐chloroethyl)oxirane], poly[(3‐chloropropyl)oxirane], and poly[(4‐chlorobutyl)oxirane] exhibit elastomeric properties and are highly reactive in nucleophilic substit

ISSN:0360-6376    

DOI:10.1002/pol.1982.170201010

出版商:John Wiley&Sons, Inc.    

年代:1982

数据来源: WILEY