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Two-Stage Crystallization Of Poly (Ether Ether Ketone) And ItsBlends With Poly (Ether Imide)

Published online by Cambridge University Press:  15 February 2011

Hsin-Lung Chen  and
Roger S. Porter
Hsin-Lung Chen
Affiliation:
Polymer Science and Engineering Department, University of Massachusetts, Amherst, MA 01003
Roger S. Porter
Affiliation:
Polymer Science and Engineering Department, University of Massachusetts, Amherst, MA 01003
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Abstract

Thermal Mechanical analysis (TMA) has been used to study the crystallizationbehavior of poly (ether ether ketone) (PEEK) and its blends with poly (etherimide) (PEI). The two crystallization stages of PEEK are clearlydistinguished by measuring the variation of film thickness with time duringisothermal crystallization. Upon blending with PEI, the distinction of thetwo PEEK crystallization stages becomes obscure. This is attributed to thedepressions in both nucleation density and spherulite growth rate uponblending with PEI.

An Avrami analysis, Modified by considering both primary and secondarycrystallization, is used to extract the respective kinetic behavior of thesetwo crystallization stages. The results indicate that the secondarycrystallization proceeded slower than the primary crystallization in thediffusion-controlled crystallization region. On the other hand, these twocrystallization stages proceeded at comparable rate in thethermodynamically-controlled crystallization region. It is also found in thediffusion-controlled crystallization that blending with PEI induced a largerdepression in the secondary crystallization rate than in the primarycrystallization rate. Explanations for these observations are proposed anddiscussed.

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References

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