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Diacetylene‐containing polymers, II. Polyesters and polyurethanes containing m , m ′‐butadiynylenedibenzyl groups
Author(s) -
Estrada Mirna R.,
Burillo Guillermina,
Ogawa Takeshi
Publication year - 1992
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.1992.220030801
Subject(s) - diacetylene , polyester , hexamethylene diisocyanate , materials science , polyurethane , differential scanning calorimetry , polymer chemistry , polymerization , polymer , composite material , physics , thermodynamics
Diacetylene‐containing polyesters and polyurethanes were prepared by the reaction of m,m‐butadiynylenedibenzyl alcohol with isophthaloyl chloride, sebacoyl chloride, hexamethylene diisocyanate and 2,4‐tolylene diisocyanate. Their thermal behavior was studied by optical microscope and differential scanning calorimetry (DSC). The polyesters were crystalline. The polyurethane prepared from hexamethylene diisocyanate and polyphthalates crystallized on cooling from their melts. All turned a reddish brown color on heating at temperatures above 200°C, and prolonged heating led to a black resin, but thermal decomposition could not be avoided. Irradiation by γ‐ray and UV light at room temperature deepened the color of the films, but the polymerization of the diacetylene groups was not appreciable. Simultaneous heating and irradiation was necessary to obtain transparent, amorphous, wine red colored films.