Citation: . CRYSTAL STRUCTURE AND MORPHOLOGY OF NASCENT SAMPLES OF SYMMETRIC AROMATIC POLYESTERS——Ⅰ.POLY(P-PHENYLENE TEREPHTHALATE)*[J]. Chinese Journal of Polymer Science, ;2003, 21(2): 189-204. shu

CRYSTAL STRUCTURE AND MORPHOLOGY OF NASCENT SAMPLES OF SYMMETRIC AROMATIC POLYESTERS——Ⅰ.POLY(P-PHENYLENE TEREPHTHALATE)*

Received Date: 31 August 2002

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 (P21/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/cm3, 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 was found for a second phase,with [001] appearing the same as for phase II of the related poly(p-oxybenzoate) (PpOBA) polymer.CTFMP crystals polymerized obove 220℃ (up to 370℃) and CTFSP crystals polymerized at 300℃ consisted of lamellae 100-200 A thick.
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