Influence of Intermolecular Entanglements on CrystallizationBehavior of Macromolecules

Abstract

Abstract: Ultra-high molar mass polyethylene(UHPE) or HDPEwas melted at various temperatures or at a constant temperature for various time, and then crystallization from the melt was investigated.The crystallization behavior of UHPE was found to be different from those of HDPE.It was found that the crystallization temperature decreased as the heating time or heating temperature increased.During the melting process, thermal motion of the chains leads to a change of chain conformation from parallel-extended chains to interpenetrated random coils, accompanied by the occurrence of entanglements.As a result, the crystallization temperature shifts to a lower temperature.In addition, the samples of UHPE with less entanglement were prepared by a freeze-drying procedure from dilute solution was proved the effect of entanglements on crystallization behavior of macromolecules.Apreliminary study on the crystallization of the samples indicates that entanglements have a pronounced effect on the crystallization behavior of macromolecules.

Key words: Entanglement, Crystallization, Ultra-high molar mass polyethylene

CLC Number:

O631

TrendMD:

FAN Zhong-Yong, YU Ying, WANG Yi-Ren, BU Hai-Shan . Influence of Intermolecular Entanglements on CrystallizationBehavior of Macromolecules[J]. Chem. J. Chinese Universities, 2003, 24(8): 1528.

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Influence of Intermolecular Entanglements on CrystallizationBehavior of Macromolecules

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