Temperature gradients in molten polymers during the cooling process

Temperature gradients of various molten polymers during the cooling process were examined using a cooling jacket apparatus coupled with a novel temper ature sensor. The temperature gradients appeared to be influenced by the he at transfer between the cooling medium and the polymer, the melt temperatur e, and crystallization temperature of the polymers. The results were then c ompared with theoretically generated data. The simple theoretical model yie lds a good comparison with the experimental data at the center of the duct but the accuracy is more limited at other radial positions. (C) 1999 John W iley & Sons, Inc.