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首页> 外文会议>International Conference on Blowing Agents and Foaming Processes; 20040510-20040511; Hamburg(DE) >THERMAL CONDUCTIVITY OF POLYURETHANE FOAMS AT DIFFERENT TEMPERATURES
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THERMAL CONDUCTIVITY OF POLYURETHANE FOAMS AT DIFFERENT TEMPERATURES

机译：聚氨酯泡沫在不同温度下的热导率

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摘要

The low thermal conductivity (λ-value) of cellular plastic is one of its most important properties. Thermal conductivity depends on the temperature gradient and the average temperature of measurement. These parameters are very important from the application point of view. This paper discusses the influence of various parameters (including the method of sample preparation, the temperature gradient and the average temperature of measurement) on λ-value of the rigid polyurethane foams blown with new generating agents (hydrocarbons, hydrofluorocarbons). The thermal insulating properties of different cellular plastics such as rigid and flexible polyurethane foams and expanded polystyrene are compared. The thermal conductivity and thermal diffusivity of foams were correlated with polyurethane matrix structure in order to show the effect of cell anisotropy on the heat insulating properties of the rigid foams blown with cyclopentane and HFC-365/227.
机译：泡沫塑料的低导热率（λ值）是其最重要的特性之一。导热系数取决于温度梯度和平均测量温度。从应用程序的角度来看，这些参数非常重要。本文讨论了各种参数（包括样品制备方法，温度梯度和平均测量温度）对用新型生成剂（烃，氢氟烃）吹制的硬质聚氨酯泡沫的λ值的影响。比较了不同多孔塑料（例如硬质和软质聚氨酯泡沫和膨胀聚苯乙烯）的隔热性能。为了显示泡孔各向异性对环戊烷和HFC-365 / 227吹制的硬质泡沫的绝热性能的影响，将泡沫的导热率和热扩散率与聚氨酯基质结构相关联。

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