Effect of Transesterification on High-pressure Crystallization Behaviour of PET/PC Blend System

Abstract

Abstract: Effect of transesterification on high-pressure crystallization behaviour of PET/PC blend system was investigated by torque rheometer, DSC, SEM and WAXD measurements. The crystallized samples of 20% PC in PET/PC blends mixed at 30 r/min and 523, 533 and 553 K for 15 min were obtained at 300 MPa and 613 K for 6 h with a self-made piston-cylinder high-pressure apparatus. SEM observation revealed that transesterification during mixing profited a quick thickening of extended-chain crystals and enhanced ester interchange at a high pressure. Wedge-shaped and bending extended-chain crystals found in these samples indicated that chain-sliding diffusion and transesterification contributed to the growth of such polyester crystal. With transesterification extent rising, the result of WAXD profile deconvolution and W-A/FT showed that the total crystallinity letted up, the mean crystallite size and micro-strain of PET increased and decreased respectively and crystallite distribution for PET widened correspondingly. The result obtained suggests that under certain conditions two procedures, i.e. crystallization-induced reaction and reaction-induced crystallization can concur for such copolymer wholly composed of crystallizable units.

Key words: PET/PC blends, High-pressure crystallization, Extended-chain crystal, Transesterification

CLC Number:

O631

TrendMD:

LV Jun, WANG Xuan-Lun, HUANG Rui, LI Liang-Bin . Effect of Transesterification on High-pressure Crystallization Behaviour of PET/PC Blend System[J]. Chem. J. Chinese Universities, 2005, 26(8): 1552.

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Effect of Transesterification on High-pressure Crystallization Behaviour of PET/PC Blend System

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