The thermal degradation of blends of phenoxy with polycaprolactone , poly ( 1 , 4-butylene adipate), poly(l,4-cyclohexane-dimethylene succinate), poly( 2 , 2-dimethyl-l , 3-propylene succinate), and poly( hexamethylene sebacate) has been studied using thermogravimetric analysis, direct-pyrolysis mass spectrometry, and infrared spectroscopy. For each blend, the polyester componenent was less thermally stable in the blend compared to the pure state. The thermal stability of the phenoxy was not affected by the presence of the polyesters in the blends. Blends of phenoxy with polycaprolactone and with poly ( 1 , 4-butylene adipate) degrade in two-step mechanisms where the amount of weight loss of each step was proportional to the composition of the blends. Directpyrolysis mass spectrometric analysis showed larger amounts of monomeric caprolactone evolved from polycaprolactone in the blend compared to pure polycaprolactone. Activation energies were calculated for these phenoxy/ polyester blends from the thermogravimetric analysis data using the Flynn-Wall method. Mechanisms are presented in explanation of the observed destabilization of the polyesters.

Library of Congress Subject Headings

Polymers--Deterioration; Polymers--Thermal properties; Phenoxy groups

Publication Date


Document Type


Department, Program, or Center

School of Chemistry and Materials Science (COS)


Moskala, Erik


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