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Title: Anisotropic linear thermal expansivity of poly(ether-ether-ketone)
Authors: GOYAL, RK
Keywords: Anisotropy
Glass Transition
Thermal Expansion
Issue Date: 2006
Publisher: Elsevier
Citation: European Polymer Journal 42(10), 2888-2893
Abstract: This paper deals with anisotropic behavior of thermal expansivity (α) of poly(ether-ether-ketone) (PEEK) sample prepared by compression molding above the melting point of polymer. The α was determined using thermo mechanical analyzer (TMA) for the temperature interval 50–250 °C in expansion mode. It is found that out-of-plane thermal expansivity (αz) is 3.8-fold of the in-plane thermal expansivity (αxy) below the glass transition temperature (Tg) of PEEK while αz is decreased to 1.8-fold of the αxy above the Tg. Moreover, the average αz over the range studied is about 2.2-fold of the αxy. This anisotropic behavior may be attributed to the alignment of polymer spherulites and chains along in-plane direction due to compressive forces under hot compression molding.
URI: 10.1016/j.eurpolymj.2006.06.018
ISSN: 0014-3057
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