CRYSTAL STRUCTURE AND MORPHOLOGY OF NASCENT SAMPLES OF SYMMETRIC AROMATIC POLYESTERS——Ⅰ.POLY(P-PHENYLENE TEREPHTHALATE)* |
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作者姓名: | G.Sidoti F.Rybnikar M.Kaszonyiova P.H.Geil |
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作者单位: | Department of Materials Science and Engineering,University of Illinois,Urbana,IL 61801,Department of Materials Science and Engineering University of Illinois,Urbana,IL 61801 Tomas Bata University of Zlin,Zlin,Czech Republic,Tomas Bata University of Zlin,Zlin,Czech Republic,Department of Materials Science and Engineering,University of Illinois,Urbana,IL 61801 |
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基金项目: | This research was supported, in part, by grants from the National Science Foundation (NSF-DMR Intemational Program 96-16255 (F. R. and P. H. G.) and NSF-DMR Polymer Program 93-12823 and 96-16255 (J. Y., G. S., J. L. and P. H. G.)) and Grant Agency of the |
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摘 要: | The morphology and crytal structure of poly(p-phenylene terephthalate) (PPT), prepared by confined thin filmmelt (CTFMP) and solution (CTFSP) and bulk solution polymerization, were characterized by transmission electronmicroscopy, electron dimaction and molecular modeling. The unit cell is monoclinic (P2_1/a space group) with parameters a =7.89, b = 5.49, c = 12.65 A, α=γ= 90°, β=100.33°, density = 1.48 g/cm~3, the a, b and β values differing slightly from thosereported previously in the literature. A degree of variation in relative intensities of hk0 reflections in, apparently, untilted[001] ED patterns was observed from a given sample, suggesting some variation in molecular packing. ED evidence wasfound for a second phase, with [001] appearing the same as for phase Ⅱ of the related poly(p-oxybenzoate) (PpOBA)polymer. CTFMP crystals polymerized above 220℃ (up to 370℃) and CTFSP crystals polymerized at 300℃ consisted oflamellae 100-200 A thick.
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关 键 词: | p-phenylene terephthalate)')" href=" #" >Poly(p-phenylene terephthalate) Electron diffiaction Crystal structure Confined thin film melt polymerization Epitaxy Morphology |
收稿时间: | 2002-08-31 |
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