Determination of average sequence length in poly(butylene terephthalate)-poly(ethylene terephthalate-co-isophthalate-co-sebacate) segmented copolyesters

被引：3
|
作者：
Zhao, YH
Xu, GH
Jia, HT
Sheng, J [1 ]
机构：
[1] Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300072, Peoples R China
[2] Tianjin Univ, Sch Chem Engn & Technol, Tianjin 300072, Peoples R China
来源：
JOURNAL OF MACROMOLECULAR SCIENCE-PURE AND APPLIED CHEMISTRY | 2003年 / A40卷 / 05期
关键词：
segmented copolyesters; poly(butylene terephthalate) (PBT); poly(ethylene terephthalate-co-isophthalate-co-sebacate) (PETIS); sequence length; degree of randomness;
D O I：
10.1081/MA-120019886
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Copolyesters, namely, poly(butylene terephthalate)-poly(ethylene terephthalate-coisophthalate-co-sebacate) (PBT-PETIS) were synthesized by means of melting transesterification. In the five-component copolycondensates system, average sequence length was calculated based on the analysis of H-1-NMR spectra and the equal probability of interchange reaction for three kinds of polyester units in PETIS with PBT. The results reveal that the average sequence length of both PBT and PETIS segments vary almost linearly with reaction time. The determination of degree of randomness that lies within the range of 0.1749-0.5282 suggests the formation of segmented copolyesters.
引用
收藏
页码：461 / 473
页数：13
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