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AC breakdown of melt-crystallized isotactic polypropylene

✍ Scribed by B. Krishnakumar; R. K. Gupta; E. O. Forster; J. R. Laghari


Publisher
John Wiley and Sons
Year
1988
Tongue
English
Weight
685 KB
Volume
35
Category
Article
ISSN
0021-8995

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The spherulitic structure of isotactic polypropylene (iPP) from the melt was studied by polarized light and scanning electron microscopy. From the crystallization morphology, it can be observed that crystallization of iPP from the melt below 132ЊC forms two types of spherulites, termed aand b-spheru

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Isotactic polypropylene (iPP) isothermally crystallized from the melt was studied by differential scanning calorimetry (DSC) and light transmission measurements techniques. When samples crystallized isothermally above 132ЊC, a-spherulites were formed only; the DSC measurements showed double melting

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## Abstract The measurement of crystallization and melting behaviors under constant rates of cooling and heating and the Avrami's analysis of isothermal crystallization were carried out for various metallocene‐ (MET‐PP) and Ziegler‐ Natta‐catalyzed (ZN‐PP) random polypropylene copolymers with vario