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Chain extenders for polyester. II. Reactivities of carboxyl‐addition‐type chain extenders; bis cyclic‐imino‐ethers
Author(s) -
Inata Hiroo,
Matsumura Shunichi
Publication year - 1986
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1986.070320534
Subject(s) - extender , polyester , polymer chemistry , oxazoline , chain (unit) , ethylene , chemistry , polymer , materials science , organic chemistry , catalysis , polyurethane , physics , astronomy
The reaction behavior of such bis cyclic‐imino‐ethers as 2, 2′‐bis(2‐oxazoline), which had been proved in the previous paper to be an effective chain extender to couple carboxyl terminals of linear polyesters through addition reaction, has been studied to evaluate their practical applicability as the chain extenders for poly(ethylene terephthalate) and poly(butylene terephthalate). It has been observed that a wide range of excess use of 2,2′‐bis(2‐oxazoline) resulted in polyesters of almost similar molecular weight. In addition, when excess amounts of the chain extender were added and the reaction conditions were fixed, the ratio of the coupled carboxyl terminals to the initial carboxyl terminals became constant regardless of the initial molecular weight and carboxyl content (CV). The results indicate that the chain‐extended polyesters possess predetermined molecular weight and CV, both of which depend only on the molecular weight and CV of the initial polymers, and not on the amount of the chain extender added.