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Transesterification and crystallization behavior of poly(butylene succinate)/poly(butylene terephthalate) block copolymers

✍ Scribed by Sang Soon Park; Seung Hun Chae; Seung Soon Im

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
249 KB
Volume
36
Category
Article
ISSN
0887-624X

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✦ Synopsis

The block copolymers of poly(butylene succinate) (PBS) and poly(butylene terephthalate) (PBT) were synthesized by melt processing for different times. The sequence distribution, thermal properties, and crystallization behavior were investigated over a wide range of compositions. For PBS/PBT block copolymers it was confirmed by statistical analysis from 1 H-NMR data that the degree of randomness ( B) was below 1. The melting peak ( T m ) gradually moved to lower temperature with increasing melt processing time. It can be seen that the transesterification between PBS and PBT leads to a random copolymer. From the X-ray diffraction diagrams, only the crystal structure of PBS appeared in the M1 copolymer (PBS 80 wt %) and that of PBT appeared in the M3 (PBS 50 wt %) to M5 (PBS 20 wt %) copolymers.

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