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Crystallization behaviour of hindered phenol on chlorinated polyethylene matrix

✍ Scribed by Chifei Wu; Tada-aki Yamagishi; Yoshiaki Nakamoto

Publisher
John Wiley and Sons
Year
2001
Tongue
English
Weight
251 KB
Volume
50
Category
Article
ISSN
0959-8103

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✦ Synopsis

Abstract

The crystallization behaviour of tetrakis[methylene‐3‐(3,5‐di‐tert‐butyl‐4‐hydroxyphenyl)propionyloxy]methane (AO‐60) molecules from several different states was investigated. It was found that, while pure AO‐60 is a crystalline substance, quenched and isothermally annealed AO‐60 is amorphous. In the case of a mixture of chlorinated polyethylene (CPE) and AO‐60, the crystallization of AO‐60 molecules is greatly affected by the initial dispersion state of the molecules. In addition, the mobility of AO‐60 molecules, which is governed by the annealing temperature and the distribution of the chain‐ends of CPE, also influences crystal growth. A CPE/AO‐60 hybrid annealed at a temperature near the melting point of AO‐60 exhibited several endothermal shoulders in addition to a sharper peak when characterized by differential scanning calorimetry. They were attributed to melting of the two kinds of crystal found either on the surface or inside the specimen. The former changes from polyhedron to platelet and then to needle shapes as the annealing temperature is reduced, whereas the latter exhibits some which are unprecedented such as deformed (warp, twist, turn and hollow) platelets.

© 2001 Society of Chemical Industry

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