Thermostable Trioxane-Dioxolane Copolymers Obtained with Boron Trifluoride: Acrylonitrile Complex as Initiator
作者:
Mihai Dimonie,
Nguyenviet Bac,
Gheorghe Dragan,
Ioan Neguluscu,
期刊:
Journal of Macromolecular Science: Part A - Chemistry
(Taylor Available online 1982)
卷期:
Volume 18,
issue 4
页码: 629-649
ISSN:0022-233X
年代: 1982
DOI:10.1080/00222338208082074
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Trioxane was copolymerized with small amounts of dioxolane in benzene in the presence of a boron trifluoride:a crylonitrile complex as initiator. The kinetics of reactions was expressed in terms of topoenergetic principles. The copolymerizations had no induction periods and the maximum reaction rate was found proportional to the square of both the initiator and monomers concentrations. A zwitterionic mechanism is suggested for initiation. The activation energy for the system with 5% dioxolane was determined as 18.3 kcal/mol. The melting behavior of the copolymers is briefly discussed as a function of the dioxolane initial content, and is indicative of the amorphous-crystalline coupling phenomenon. The copolymers with ∼ 5% dioxolane are thermostable in air up to 250%deg; and are recommended for practical purposes.
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