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Directed Crystallisation of Synthetic Polymers by Low-Molar-Mass Self-Assembled Templates

✍ Scribed by Aurora Nogales; Robert H. Olley; Geoffrey R. Mitchell

Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
307 KB
Volume
24
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

A novel and powerful method of microstructure control in polyolefins is presented. By dispersing tiny amounts of sorbitol derivatives in the polymer, the subsequent crystal growth can be controlled with modest prior flow‐fields; in particular high levels of preferred orientation are generated in the resultant crystals. Under shear flow, the additive forms highly extended crystals which lie parallel to the flow‐field and which serve to direct the crystallisation of the polymer leading to a massive amplification of the anisotropy present in the melt.

TEM image of a carbon replica taken from an etched surface of a PE sample containing 1% of DBS.

magnified imageTEM image of a carbon replica taken from an etched surface of a PE sample containing 1% of DBS.

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