摘要:

Abstract4‐(1,1‐Dicyanoethylazo)benzyl methacrylate (3), a new azo‐monomer, was copolymerized with styrene, methacrylonitrile, and methyl methacrylate (MMA) giving azo‐copolymers. The compositions of the copolymers from3and MMA were nearly identical with those of the monomer mixtures. Thus allowing 100% conversion leading to copolymers of almost identical chemical composition. These azo‐copolymers were used as initiators for different monomers in either emulsion or solution, resulting in graft‐copolymers. The graft‐copolymers were characterized by IR and GPC. In one case the raw graft‐copolymer was separated into ungrafted backbone‐polymer, grafted copolymer, and homopolymer of the compon

ISSN:0025-116X    

DOI:10.1002/macp.1980.021810801

出版商:Hüthig&Wepf Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractPolymeric metal complexes were synthesized mechanochemically by ultrasonic action on mixtures of poly(ethylene terephthalate), ethylenediamine, and vanadium trichloride or by vibratory milling of a mixture of poly(ϵ‐caprolactam) and manganese dichloride (MnCl2·4H2O). The influence of duration of ultrasonic action or vibratory milling as well as the ratio of reagents on the efficiency of complexation was studied. The resulting products were characterized spectroscopically (by IR and ESR spectra), by elemental analyses, and by X‐ray diffraction. They show a relatively high thermostability and semiconduct

ISSN:0025-116X    

DOI:10.1002/macp.1980.021810802

出版商:Hüthig&Wepf Verlag    

年代:1980

数据来源: WILEY

摘要:

Abstract2‐Ethyl‐1,3,2‐dioxaboracycloalkanes polymerize more slowly than the analogous 2‐aryl compounds. This is due to a difference in the bond type of the O—B—O group as shown by IR spectra and mass spectra. For the polymerization of 2‐aryl‐1,3,2‐dioxaboracycloalkanes the metathetic mechanism, postulated and proved in a foregoing pap

ISSN:0025-116X    

DOI:10.1002/macp.1980.021810803

出版商:Hüthig&Wepf Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractA new class of nitroaniline derivatives of diacetylene monomers was synthesized for the study of the nonlinear optical properties of their solid state polymers. Several members provide further examples of solid state polymerization by thermal annealing.

ISSN:0025-116X    

DOI:10.1002/macp.1980.021810804

出版商:Hüthig&Wepf Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractEffective catalysts for the copolymerization of CO2with 1,2‐epoxypropane were prepared from partiallyO‐methylated or crosslinked poly[1‐(4‐hydroxyphenyl)ethylene] and Zn(C2H5)2. The highest activity was obtained with catalysts of 30 to 40% methylation or crosslinking. Inactivation of the catalysts during the copolymerization was decreased by crosslinking, increasing the yield of the copolymer. The higher rigidity of the catalyst structure is responsible for its higher activity and st

ISSN:0025-116X    

DOI:10.1002/macp.1980.021810805

出版商:Hüthig&Wepf Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractThe addition of unsaturated organic halides during the metathesis polymerization reaction of cyclooctene, using a WCl6/diisobutylaluminium chloride/2,6‐di‐tert‐butyl‐4‐methylphenol catalyst, was found to cause instantaneous conversion of the unreacted monomer to polymer. Both 1,2‐dichloroethene and 1,6‐dibromo‐3‐hexene were found to be very effective for this purpose. When 1,4‐dichloro‐2‐butene was added during the reaction, unusual and unexplained products were obtained, but when it was added to the catalyst before the start of the reaction a very fast polymerization occurred yielding high molecular weight polymers. Changes in polymer melting points with reaction time suggested that isomerization occurred after polymerization and that the initial polymers formed had slightly blo

ISSN:0025-116X    

DOI:10.1002/macp.1980.021810806

出版商:Hüthig&Wepf Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractEt2Zn in combination with POCl3induces the cationic polymerization of isobutyl vinyl ether andN‐vinyl carbazole at ambient temperature. The rate is directly proportional to [Et2Zn]. [POCl3] up to a mole ratio of unity of the components, and thereafter it decreases. At a fixed ratio of [Et2Zn]/[POCl3] the rate is second order in [Isobutyl vinyl ether]. Rate and [η] decrease in the presence of basic additives, pyridine, and water. Unlike the system Et3Al/POCl3, the present combination does not lead to any stereoregular poly(isobutyl vinyl ether) at ambient or lower temperatures. A cationic mechanism is proposed and an appropriate kinetic scheme is suggest

ISSN:0025-116X    

DOI:10.1002/macp.1980.021810807

出版商:Hüthig&Wepf Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractThe kinetics of photo‐oxidative degradation and stabilization of poly(1‐butene), [poly(1‐ethylethylene), PB‐1] at 253, 7 nm and a constant intensity of 2,38·10−9Einstein.s−1·cm−2(1,12·10−3J·mol−1·s−1·cm−2) was studied in the absence and presence of 0,1 wt.‐% 6‐(2‐hydroxyphenyl)‐2,4‐diphenyl‐1,3,5‐triazine (1) dispersed evenly in the matrix of polymer films in the temperature range of 267 to 313 K. The progress of the reaction was followed by measuring the rate of chain scission of the polymer. It has been confirmed by light scattering and potassium ferrioxalate actinometric measurements that random scission of the polymer chain occurs and1acts as a stabilizer to the photo‐oxidative degradation processes. Irrespective of the variations in the values of ΔH≠and ΔS≠the values of ΔF≠remain almost constant around 159 kJ·mol−1indicating that

ISSN:0025-116X    

DOI:10.1002/macp.1980.021810808

出版商:Hüthig&Wepf Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractThe excluded volume parameterBfor poly(N‐1,1‐dimethyl‐3‐oxobutylacrylamide) in 2‐butanone at 25°C is evaluated either from limiting viscosity numbers or from second virial coefficients as obtained in light scattering measurements, and also through a procedure in which both kinds of experimental data are simultaneously employed. The values so obtained are in reasonable agreement, except for the one evaluated by applying the original Stockmayer‐Fixman equation, which is largely underestimated as already found for other polymer‐s

ISSN:0025-116X    

DOI:10.1002/macp.1980.021810809

出版商:Hüthig&Wepf Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractThe structure and the thermodynamics of polymer blends made from two poly(styrene/acrylonitrile) copolymers with a different ratio of styrene/acrylonitrile are investigated by neutron scattering. These systems are endothermic, exhibit a positive value for the Huggins parameter χ and show phase separation at sufficiently large molecular weights. The results are in good agreement with the corresponding states theory of Prigogine and Patterson. Other polymer blends are exothermic, exhibit negative χ‐values and are compatible even for infinitely large molecular weights. In these cases one can adapt the theoretical equations to the experiments by the introduction of a suitable parameter for an exothermic contact energy. This is shown for blends from poly(methyl methacrylate) and poly(styrene/acrylonitri

ISSN:0025-116X    

DOI:10.1002/macp.1980.021810810

出版商:Hüthig&Wepf Verlag    

年代:1980

数据来源: WILEY