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Preparation of poly(ethylene terephthalate-co-isophthalate) by ester interchange reaction in the PET/PEI blend system

✍ Scribed by Wan Shik Ha; Yong Kun Chun; Seung Soon Jang; Do Mook Rhee; Chong Rae Park

Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 186 KB
Volume: 35
Category: Article
ISSN: 0887-6266
DOI: 10.1002/(sici)1099-0488(19970130)35:2<309::aid-polb8>3.0.co;2-m

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✦ Synopsis

Optimum conditions for the synthesis of PEI of considerable molecular weight have been established. Poly(ethylene terephthalate-co-isophthalate) (PETI) has been prepared through the ester interchange reaction of a blend of poly(ethylene terephthalate) (PET) and poly(ethylene isophthalate) (PEI). NMR analysis has indicated that the PETI changes from a block-type copolymer to a random type copolymer as the ester interchange reaction proceeds. If the reaction is limited to 20 min, the resulting PETI is crystallizable. The effects of catalysts that have been used during the synthesis of PEI on the characteristics of PETI are also discussed.

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