若水性聚氨酯软段选用有着结晶性能的低聚物二醇,水性聚氨酯的防水透湿性会在其相变化温度Tc(即原材料的软段玻璃化变化温度Tg或结晶熔融温度Tm)周围产生显著变化。在温度小于软段的Tc时,水性聚氨酯膜处于玻璃态或结晶状态,高分子链冻结,自由体积小则透湿性能偏弱。当温度超过软段的Tc时,水性聚氨酯膜逐渐向无定形状态...
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