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Effect of segment structure on the thermal stability of CPVC in the Gas–Solid PVC chlorination process
Author(s) -
Bai Tianxiang,
Wang Heyun,
Chen Siyu,
Yu Erlei,
Wei Zhong
Publication year - 2020
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.49396
Subject(s) - chlorinated polyvinyl chloride , thermal stability , chlorine , polyvinyl chloride , chemical engineering , chemical structure , chemistry , rheology , polymer chemistry , diene , conjugated system , materials science , organic chemistry , polymer , composite material , natural rubber , engineering
The chlorination of the polyvinyl chloride resin with different ratios of CH 2 , CHCl 2 , and CCl 2 was carried out through a gas–solid process by varying the temperature, reaction time, and chlorine concentration. The rheological properties and thermal stability of the resin were characterized. 13 C NMR was used to characterize the segment structure of the resin. In addition, conjugated diene structure was determined by UV–Visible to study its chlorination process. The results show that CCl 2 units in the structure promote the dehydrochlorination of CPVC, forming a conjugated diene structure and reducing the rheological properties and thermal stability. In contrast, the formation of CHCl in the chlorination process increased the thermal stability of the resin. Moreover, a structure‐effect relationship between the structure and performance has been established, and a stepwise process of chlorination was obtained by analyzing the changes of the structure segment content at different stages.