Stress relaxation of semi-crystalline polyester films: Aging rate effects

被引：0

作者：

Gillmor, JR ^{[1
]}

Greener, J ^{[1
]}

机构：

[1] Eastman Kodak Co, Rochester, NY 14650 USA

来源：

ANTEC '99: PLASTICS BRIDGING THE MILLENNIA, CONFERENCE PROCEEDINGS, VOLS I-III: VOL I: PROCESSING; VOL II: MATERIALS; VOL III: SPECIAL AREAS; | 1999年

关键词：

PEN; PET; stress relaxation; physical aging; film;

D O I：

暂无

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Using stress relaxation measurements, we describe the kinetics of the physical aging process for two semicrystalline, biaxially stretched polyester films, PET and PEN, within their respective a transition regimes. By applying the principles of time-aging time and time-aging temperature equivalence, we establish the temperature dependence of the corresponding aging acceleration factors over a temperature range spanning from ca. Tg - 40 degrees C to Tg. The results for both materials show significant increase in the rate of physical aging at ca. 20 degrees C below the glass transition temperature. However, the increase in aging rate is approximately tenfold higher for PET, implying that the segmental mobility of this polymer is significantly higher at the corresponding temperature.

引用

页码：1860 / 1865

页数：6

共 10 条

[1] Influence of liquid crystalline order on the dielectric relaxation of random copolyesters of PET, PEN, and PHB [J].