Crystallization and Melting Behavior of Isotactic Polybutene-1 at High Pressures

Kishore, K and Vasanthakumari, R (1986) Crystallization and Melting Behavior of Isotactic Polybutene-1 at High Pressures. In: Journal of Polymer Science: Part A: Polymer Chemistry, 24 . pp. 2011-2019.

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Abstract

An equation has been developed for the study of the kinetics of polymer crystallization at high pressures using differential scanning calorimetry (DSC) in the dynamic mode of operation. The activation energy for the crystallization of isotactic polybutene-1 (PB-1) has been determined to be ca. 20 kcals/mol; this has been attributed to the transport of chain segments to the site of crystallization. The melting behavior of form-I PE-1 crystals has been studied by using a high-pressure differential thermal analyzer (DTA) setup and high-pressure DSC. The melting temperature T, does not show any significant change with pressure in the low pressure region up to 1.2 kbar; beyond this point a large increase in T, with pressure was observed. This unusual low-pressure behavior of PEL1 has been attributed to formation of intermediate form I, which has a lower melting point than form I.

Item Type:	Journal Article
Publication:	Journal of Polymer Science: Part A: Polymer Chemistry
Publisher:	John Wiley & Sons, Inc.
Additional Information:	The copyright belongs to John Wiley & Sons, Inc.
Keywords:	crystallization;isotactic polybutene;high pressures;calorimetry
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	01 Sep 2005
Last Modified:	19 Sep 2010 04:19
URI:	http://eprints.iisc.ac.in/id/eprint/3585

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