Cyclic Acetal-Photosensitized Polymerization. 9. Photopolymerization of Triallylidene Sorbitol
作者:
Tatsuro Ouchi,
期刊:
Journal of Macromolecular Science: Part A - Chemistry
(Taylor Available online 1981)
卷期:
Volume 15,
issue 3
页码: 417-429
ISSN:0022-233X
年代: 1981
DOI:10.1080/00222338108074381
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The photopolymerization of triallylidene sorbitol (TAS) was carried out in benzene at 40°C without the usual initiator. The polymerization of TAS was found to be initiated with the ester radical generated via the acetal radical from TAS by means of photoirradiation. The rate of polymerization and the molecular weight of polymer were small due to the degradative chain transfer, It was kinetically investigated from the standpoints of the degradative chain transfer by the allylidene group and the cyclization by three double bonds. The following results were obtained: (1) The relation between the rate of polymerization, Rp, the monomer concentration, [M], could be expressed by [M] /Rp= (A[M] + B)/(3[M] + C), where A, B, and C were constant; (2) the ratio of the rate constant of unimolecular cyclization to the total rate constant of bimolecular propagation and the chain transfer of uncyclized radical was estimated to be 3.0 mol/dm3. A small amount of cyclopolymerization took place.
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