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Building lamellae from blocks: The pathway followed in the formation of crystallites of syndiotactic polypropylene

T. Hugel, G. Strobl, R. Thomann. Acta Polymerica, 50, 214 (1999)

Abstract

AFM images of isothermally crystallized samples of syndiotactic polypropylene and poly(propene-co-octene) show that the lamellar crystallites are composed of blocks. Upon heating the granular structure vanishes. Observations support the view recently established by SAXS experiments that polymer crystallization is a two-step process, with the block formation near the growth front as a first and their fusion into a lamella as a second step. It is proposed that the blocks have the minimum size necessary to remain intrinsically stable. This could explain the observed invariability of the crystal thickness with changing co-unit content.

 

 

 

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