Thermal Decomposition of Polyisoprene, Poly(p-isopropyl α-Methylstyrene), and Poly(isoprene/p-isopropyl α-Methylstyrene)
作者:
S.L. Malhotra,
C. Baillet,
L.P. Blanchard,
期刊:
Journal of Macromolecular Science: Part A - Chemistry
(Taylor Available online 1978)
卷期:
Volume 12,
issue 10
页码: 1427-1459
ISSN:0022-233X
年代: 1978
DOI:10.1080/00222337808069410
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Thermal decompositions of polyisoprene, poly(p-isopropyl α-methylstyrene) (PPIPαMS), and poly(isoprene/p-isopropyl α-methylstyrene) (sample M-32) were carried out at various temperatures in the range 200–340° C in a differential thermo-gravimetric apparatus. The undecomposed polymers as well as their decomposed residues were analyzed by gel-permeation chromatography (GPC), infrared spectroscopy (IR), and nuclear magnetic resonance (NMR). Based on the changes observed in the distribution of molecular weights, depolymerization is the predominant step in the decomposition of PPIPAMS and polymer M-32, whereas random scissions predominate in the case of polyisoprene. The combined data of GPC, IR, and NMR indicate that only interchain reactions leading to the formation of cyclized products are present in the decomposition of polyisoprene while interchain as well as intrachain reactions are operative in the case of polymer M-32.
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