Thermal  cis – trans  isomerization of 4‐diethylamino‐4′‐methoxyazobenzene in poly( D (−)3‐hydroxybutyrate) and its hydroxyvalerate copolymer as a probe for characterizing their aging | Zendy

DubiniPaglia Ernestina | Zendy; Castelli Antonella | Zendy; Beltrame Pier Luigi | Zendy; Seves Alberto | Zendy; Marcandalli Bruno | Zendy

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Thermal cis – trans isomerization of 4‐diethylamino‐4′‐methoxyazobenzene in poly( D (−)3‐hydroxybutyrate) and its hydroxyvalerate copolymer as a probe for characterizing their aging

Author(s) -

DubiniPaglia Ernestina,

Castelli Antonella,

Beltrame Pier Luigi,

Seves Alberto,

Marcandalli Bruno

Publication year - 1995

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.1995.070560814

Subject(s) - isomerization , polyester , copolymer , polymer , materials science , polymer chemistry , ethylene , kinetics , accelerated aging , chemistry , organic chemistry , catalysis , composite material , physics , quantum mechanics

The aging of bacterial polyester poly( D (—)3‐hydroxybutyrate) has been studied by coloring it with 4‐diethylamino‐4′‐methoxyazobenzene and determining the reduction in isomerization rate of the dye with aging, such a reduction being a measure of the loss in polymer sequential mobility that is responsible for the considered phenomenon. A preliminary test carried out on poly(ethylene terephthalate) colored with 4‐diethylaminoazobenzene proved the isomerization of the dispersed dye to be a sound probe for determining the aging process. In the case of the bacterial polyester, the aging process appeared even above the polymer T g value measured by calorimetric analysis. The kinetics and rate coefficients of aging were determined at 30°C for the examined polymers. Aging in the copolymer poly(hydroxybutyrate‐hydroxyvalerate) was also investigated. © 1995 John Wiley & Sons, Inc.

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