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Influence of shear on polypropylene crystallization kinetics

✍ Scribed by Hong Huo; Yanfeng Meng; Hongfei Li; Shichun Jiang; Lijia An

Book ID
111631964
Publisher
Springer-Verlag
Year
2004
Tongue
English
Weight
393 KB
Volume
15
Category
Article
ISSN
1292-8941

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The isothermal crystallization of isotactic polypropylenes has been studied under static conditions and under shear Γ½ow. The shear was induced by displacement of a glass ΓΌbre in the molten polymer. An a-monoclinic crystalline phase was formed with a columnar organization at the surface of the glass

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## Abstract Melting‐point and spherulite growth rate measurements for a sample of syndiotactic polypropylene (__S__ = 0.716 and Ξ· = 0.356) were analyzed for the parameters characterizing crystal formation and growth: __T__~__m__~ = 159 Β± 2Β°C, Οƒ~__e__~ = 47 erg cm ^βˆ’2^, Οƒ = 4.4 erg cm^βˆ’2^, and __q__