Process monitoring and kinetics of rigid poly(urethane-isocyanurate) foams

被引:0
|
作者
Peng, S
Jackson, P
Sendijarevic, V
Frisch, KC
Prentice, GA
Fuchs, A [1 ]
机构
[1] Univ Nevada, Reno, NV 89557 USA
[2] Univ Detroit Mercy, Inst Polymer, Detroit, MI 48219 USA
关键词
poly(urethane-isocyanurate); kinetics; process monitoring; thermophysical properties;
D O I
10.1002/(SICI)1097-4628(20000711)77:2<374::AID-APP14>3.3.CO;2-B
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Process temperature profiles of a two-component rigid poly(urethane-isocyanurate) foam system were studied and compared with the predictions of a one-dimensional numerical simulation. This model is based on experimentally determined thermophysical properties including thermal diffusivity, enthalpy of reaction, and rate of reaction. Temperature profiles were measured at three positions within the foam and at the foam surface for mold temperatures of 25 degrees C and 55 degrees C. A high rate of reaction and heat of reaction, along with low thermal diffusivity, cause temperatures near the foam center to be insensitive to mold temperatures for thick samples. Thermal analysis was used for determination of thermophysical properties. Temperature-dependent heat capacity, reaction kinetics, and heat of reaction were evaluated using temperature-scanning DSC. Thermal conductivity was analyzed from steady-state heat profiles. The system reaction kinetics indicated much faster kinetics than reflected by process cure temperature profiles made using thermocouples. The simulations accurately predict experimental results, allowing determination of demold time dependence on process conditions, including feed temperature, mold temperature programming, and sample thickness. (C) 2000 John Wiley & Sons, Inc.
引用
收藏
页码:374 / 380
页数:7
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