摘要:

AbstractPrepolyesters were obtained from castor oil and dibasic acids, viz oxalic, malonic, succinic, glutaric, adipic, suberic and sebacic acid. These prepolyesters (PPE) were subsequently interpenetrated with methyl methacrylate containing 1% ethylene glycol dimethacrylate as crosslinker by radical polymerization initiated with benzoyl peroxide. The novel PPE poly(methyl methacrylate) PPE/PMMA interpenetrating polymer networks (IPNs) were obtained as powder. They were characterized by solubility behaviour, IR spectral study and thermal behaviour.

ISSN:0003-3146    

DOI:10.1002/apmc.1989.051650111

出版商:Hüthig&Wepf Verlag    

年代:1989

数据来源: WILEY

摘要:

AbstractA series of new poly(vinyl alcohol)‐g‐methyl methacrylate/N‐substituted maleimide graft terpolymers were prepared by reacting the residual anhydride groups on the poly(vinyl alcohol)‐g‐methyl methacrylate/maleic anhydride with the appropriate N‐substituted amines through the poly(vinyl alcohol)‐g‐methyl methacrylate/N‐substituted maleamic acid intermediate. Here, the N‐substituted amines were N‐benzyl, N‐butyl, N‐octyl, N‐dodecyl and N‐ethylol amines. The compositions and the proposed structure of the resultants were determined by elemental and infrared analyses. The water content, thermal and mechanical properties of the new poly(vinylalcohol) graft terpo

ISSN:0003-3146    

DOI:10.1002/apmc.1989.051650112

出版商:Hüthig&Wepf Verlag    

年代:1989

数据来源: WILEY

摘要:

AbstractThe influence of acrylonitrile‐butadiene‐styrene‐terpolymer (ABS) and methyl methacrylate‐butadiene‐styrene‐terpolymer (MBS) modifying the polystyrene (PS) films on its resistance to UV radiation were investigated.On the basis of the results of ESR, IR, UV, mass spectroscopy, viscosimetric and solubility measurements it was found that 3% of ABS or MBS in polystyrene films have a clear influence on the course of photochemical processes. After UV‐irradiation of the samples, at the presence of this terpolymers, a greater concentration of free radicals with shorter half‐life times was observed.Both terpolymers increase the productivity of photooxydation of polystyrene as well as its crosslinking and decrease its

ISSN:0003-3146    

DOI:10.1002/apmc.1989.051650113

出版商:Hüthig&Wepf Verlag    

年代:1989

数据来源: WILEY

摘要:

AbstractThe hydrogenation kinetics of multiple bonds in HO‐terminated telechelic polybutadienes was investigated using two types of these prepolymers prepared by the anionic and radical polymerization. The rate of addition of hydrogen to the π‐bonds of these polydienes in the presence of tris(triphenylphosphine) rhodium chloride as a homogeneous hydrogenation catalyst was determined by the chemical structures of the starting polydienes, their concentration in the solvent, the partial hydrogen pressure, the concentration of the catalyst, and the temperature.The effect of kinetic parameters given above on the rate of hydrogenation reaction can be interpreted in the sense of Wilkinson's reaction mechanism of the hydrogenation of alkenes in the presence of the Rh(I)‐complex. Due to the predominant 1,2‐structural units, the anionic prepolymer reacted twice as quickly with hydrogen (k = 0.093 mol−1dm3s−1) compared with the radical prepolymer (k = 0.045 mol−1dm3s−1). During the hydrogenation of multiple bonds there is a partial loss of hydroxy groups in modified telechelic prepolymers; the extent of this reaction depends on reaction conditions of the hydrog

ISSN:0003-3146    

DOI:10.1002/apmc.1989.051650114

出版商:Hüthig&Wepf Verlag    

年代:1989

数据来源: WILEY

摘要:

AbstractDes copolymères multiséquencés comportant des séquences cristallisables de poly(diméthylsilyl‐1 diméthyléthylènesilyl‐4 benzène) et des séquences, soit de polystryrène (PS), soit de poly(oxyéthylène) (POE), ont été préparés par réaction d'hydrosilylation entre polymères précurseurs, α,ω‐difonctionnels. Le polymère organosilicique utilisé portait des fonctions diméthylsilane aux deux extrémités de sa chaîne. Les polymères précurseurs PS et POE étaient dotés aux deux extrémités de leur chaîne de fonctions silvinyliques portées par un motif chimique de même nature que celle de l'unité monomère de la séquence organosilicique. Dans des conditions expérimentales adéquates, la réaction d'hydrosilylation conduit alors à des copol

ISSN:0003-3146    

DOI:10.1002/apmc.1989.051650115

出版商:Hüthig&Wepf Verlag    

年代:1989

数据来源: WILEY

ISSN:0003-3146    

DOI:10.1002/apmc.1989.051650116

出版商:Hüthig&Wepf Verlag    

年代:1989

数据来源: WILEY