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New block copolymers—III. Synthesis, characterization and crosslinking studies of an (A-B)n type block copolymer

✍ Scribed by B.M. Mahato; S.C. Shit; S. Maiti

Publisher
Elsevier Science
Year
1985
Tongue
English
Weight
421 KB
Volume
21
Category
Article
ISSN
0014-3057

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✦ Synopsis

A new block copolymer was prepared by low temperature polycondensation between (acid chloride)-terminated poly(trimethylene terephthalate), as the hard block, and amine-terminated butadiene/acrylonitrile rubber, as the soft block. The polymer was characterized by elemental (nitrogen) analysis, i.r. and NMR spectroscopy. The analysis of the content of the block in the copolymer was carried out by the NMR peak area integration method. The polymer is soluble in polar aprotic solvents. X-ray study reveals that the crystallinity in the polymer is due to the presence of the hard block. The polymer behaves like a thermoplastic elastomer between ambient temperature and 125 °. Above 150 ~' , particularly around 200 °, the residual unsaturation of the soft block results in crosslinking. Crosslinking and thermal behaviour of the polymer are also reported.

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