Ultrasonic Modification of Polymers. II. Degradation of Polystyrene, Substituted Polystyrene, and Poly(n-vinyl Carbazole) in the Presence of Flexible Chain Polymers
作者:
S.L. Malhotra,
期刊:
Journal of Macromolecular Science: Part A - Chemistry
(Taylor Available online 1982)
卷期:
Volume 18,
issue 7-8
页码: 1055-1085
ISSN:0022-233X
年代: 1982
DOI:10.1080/00222338208066479
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Ultrasonic (20 kHz, 70 W) solution degradations of polystyrene, substituted polystyrenes, and poly(n-vinyl carbazole) have been carried in toluene and tetrahydrofuran at 27 and -20°C in the presence of flexible chain polymers. Polystyrene formed block copolymers at 27°C with stiff-chain polymer PVCz; however, in the presence of flexible chain polymers, e.g., poly(vinyl methyl ketone) or poly(vinyl methyl ether), there were no block copolymers formed. Poly(n-vinyl carbazole) does not seem to form any block copolymers at 27°C with flexible chain polymers, e.g., poly(octadecyl methacrylate) and poly(ethyl methacrylate). Poly(p-chlorostyrene) and poly(p-methoxystyrene) also do not form block copolymers at 27°C with poly(octadecyl methacrylate) but do so with poly(hexadecyl methacrylate). It is quite possible that these may only be blends of two homopolymers. Poly(octa-decyl methacrylate) does yield a block copolymer when sonicated at -15°C with poly(p-isopropyl α-methylstyrene).
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