A simple model for heterogeneous nucleation of isotactic polypropylene

Michael P. Howard; Scott T. Milner

doi:10.1021/ma400702q

A simple model for heterogeneous nucleation of isotactic polypropylene

Michael P. Howard, Scott T. Milner

Research output: Contribution to journal › Article › peer-review

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Abstract

A model for heterogeneous nucleation of isotactic polypropylene in terms of a "cylindrical cap" with the critical size and barrier set by a contact angle is described. Quiescent crystallization data for bulk samples of isotactic polypropylene are analyzed to extract a contact angle in the range of 40 to 70 with a mean value of 56, which corresponds to a factor of 6 decrease in the critical barrier from the homogeneous case. This value is in reasonable agreement with the contact angle of 79 ± 3 estimated from molecular scale theory (DOI 10.1021/ma400703m). This model could be combined with calculations from melt rheology of entropy reduction due to flow to frame discussions of flow-induced crystallization.

Original language	English (US)
Pages (from-to)	6593-6599
Number of pages	7
Journal	Macromolecules
Volume	46
Issue number	16
DOIs	https://doi.org/10.1021/ma400702q
State	Published - Aug 27 2013

All Science Journal Classification (ASJC) codes

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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10.1021/ma400702q

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AU - Milner, Scott T.

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AB - A model for heterogeneous nucleation of isotactic polypropylene in terms of a "cylindrical cap" with the critical size and barrier set by a contact angle is described. Quiescent crystallization data for bulk samples of isotactic polypropylene are analyzed to extract a contact angle in the range of 40 to 70 with a mean value of 56, which corresponds to a factor of 6 decrease in the critical barrier from the homogeneous case. This value is in reasonable agreement with the contact angle of 79 ± 3 estimated from molecular scale theory (DOI 10.1021/ma400703m). This model could be combined with calculations from melt rheology of entropy reduction due to flow to frame discussions of flow-induced crystallization.

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A simple model for heterogeneous nucleation of isotactic polypropylene

Abstract

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