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A triple-bonds-containing poly(ether/ester): synthesis, characterization and cross-polymerization

✍ Scribed by Zlatan Denchev; Ivo Dudevski; Jordanka Petrova; Stoyko Fakirov

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
665 KB
Volume
196
Category
Article
ISSN
1022-1352

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✦ Synopsis

A segmented poly(ether/ester) multiblock copolymer containing acetylene groups within the hard segment was synthesized starting from poly(ethy1ene glycol) with a number-average molecular weight M, = 1 OOO, 2-butyne-l,4-diol and terephthaloyl dichloride. Thermal and spectroscopic data suggest a blocky structure of the copolymer prepared. Nuclear magnetic resonance spectroscopy shows an average degree of polymerization of the hard segments of about 6. By heating in the presence or absence of a catalyst, the monoacetylene units in the hard segments are cross-polymerized below and above their melting temperature. The crosspolymerized material reveals a maximum gel fraction of 933 wt.-%, does not crystallize and shows reversible deformability in contrast to the starting polymer. In accordance with previous reports it is concluded that cross-polymerization is possible only in a polymer distinguished by some degree of chain ordering.

-CN4.5).

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