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发布时间：2024-10-14

论文类型：期刊论文

发表时间：2022-07-03

发表刊物：高分子材料科学与工程

所属单位：化工学院

卷号：23

期号：3

页面范围：92

ISSN号：1000-7555

摘要：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).

备注：新增回溯数据