Crystal Structure and Its Transition for Poly(aryl ether ketone ketone) s(Ⅰ)

Abstract

Abstract: Poly(aryl ether ketone ketone)s (PEKK) was a high-performance engineering plastics, By means of Wide Angle X-ray Diffraction(WAXD)and DifferentiaI Scanning Calorimetry( DSC) methods, PEKKsamples crystallized in solvent induction, from glass state and from melting state were studied.Crystal formsⅠand Ⅱfor PEKKwere found.The formation of crystal formⅡwas dependent on thermal history and solvent induction, and this form Ⅱhad melting point 10 ℃ or so lower than that of formⅠcrystallized from glass state.All PEKKsamples had low melting peaks which were relevant to the polarization of PEKKmolecular chain, while they had nothing to do with thermal history.The heat of fusion for PEKKlow melting peaks accounted for percentage of 2 to 10 or so of the whole heat of fusion, And PEKKhas its equilibrium melting point of 409℃.

Key words: Polymorphism of poly(aryl ether ketone ketone)s, Thermal analysis, Polarization of molecular chain

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KE Yang-Chuan, WU Zhong-Wen, ZHENG Yu-Bin, JI Xiang-Ling, YANG De-Cai. Crystal Structure and Its Transition for Poly(aryl ether ketone ketone) s(Ⅰ)[J]. Chem. J. Chinese Universities, 1996, 17(8): 1305.

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Crystal Structure and Its Transition for Poly(aryl ether ketone ketone) s(Ⅰ)

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