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Indexed by:期刊论文

Date of Publication:2022-07-03

Journal:高分子材料科学与工程

Affiliation of Author(s):化工学院

Volume:23

Issue:3

Page Number:92

ISSN No.:1000-7555

Abstract:The kinetics of(R,S) beta-butyrolactone polymerization initiated with a
   new distannoxane compound were investigated at various monomer/initiator
   ratios and reaction temperatures with dilatometer.According to the
   kinetics studies,chain propagation rate for beta-butyrolactone
   polymerization using distannoxane were first order in monomer
   concentration and 0.56 order in initiator
   concentration,respectively.~(13)C-NMR spectra analysis of stereochemical
   sequence distributions at various polymerization temperatures for the
   distannoxane showed activation energy(DeltaE=Es-Ei) of ca.-13 kJ/mol for
   syndiotactic versus isotactic diad formation.The triad stereosequence
   distributions of the synthetic P3HB agreed well with the Bernoulli model
   of chain end stereocontrol.Theses analyses show that distannoxane
   initiator produces preferentially syndiotactic polyesters(syndiotactic
   diad fraction from 0.6 to 0.7).

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