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Temperature gradients in molten polymers during the cooling process

✍ Scribed by N. Sombatsompop; D. Chonniyom; A. K. Wood

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
215 KB
Volume
74
Category
Article
ISSN
0021-8995

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✦ Synopsis

Temperature gradients of various molten polymers during the cooling process were examined using a cooling jacket apparatus coupled with a novel temperature sensor. The temperature gradients appeared to be influenced by the heat transfer between the cooling medium and the polymer, the melt temperature, and crystallization temperature of the polymers. The results were then compared with theoretically generated data. The simple theoretical model yields a good comparison with the experimental data at the center of the duct but the accuracy is more limited at other radial positions.

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## Abstract Supercritical carbon dioxide (scCO~2~) is a promising foaming agent for the production of polymeric foams, representing an environmentally friendly alternative for the foaming agents currently used. During the expansion phase of the scCO~2~‐foaming process, temperature plays an essentia