【摘要】 用动态热机械法（ＤＭＡ） 研究了聚氨酯／ 聚丙烯酸酯互穿聚合物网络（ＰＵ／ＰＥＡＩＰＮ） 的动态热机械特性，并分别与单纯的聚氨酯（ＰＵ） 和聚丙烯酸乙酯（ＰＥＡ） 的动态热机械性能进行对比。结果表明：在玻璃化温度以下，ＰＵ／ＰＥＡＩＰＮ 的ＤＭＡ 曲线振幅小于单纯的ＰＵ 和ＰＥＡ；当完全进入高弹态后，ＩＰＮ 的ＤＭＡ 曲线振幅大于单纯的ＰＵ 和ＰＥＡ。ＰＵ／ＰＥＡＩＰＮ 的玻璃化转变温度别比ＰＵ 和ＰＥＡ 提高１６ ．２ 和３０ ．１ 度；玻璃化转变过程的松弛时间分别延长２１１ ．２ 和３８１ ．６ 秒。ＰＵ／ＰＥＡＩＰＮ 的ＤＭＡ 曲线展示出它的玻璃化转变为连续渐变的过程，曲线振幅逐渐增大，无明显的突变点和等幅振荡起始点，直至第二个玻璃化转变完成以后，ＤＭＡ 曲线才出现较规律的周期性等幅振荡，两次松弛过程几乎连为一体。结果还表明，由于ＰＵ 和ＰＥＡ 在热力学上的不相溶性，导致ＰＵ／ＰＥＡＩＰＮ 材料内部存在相当大程度的相分离。更多还原

【Abstract】 The dynamic thermo-mechanical (DMA) behaviour of Polyurethane/Polyethgl Acrylate Interpenetrating Polymer Networks (PU/PEA IPN) was observed and then compared with those of Polyurethene (PU) and Polyethyl Acrylate (PEA), respectively. The results show that the amplitude in Glass State of PU/PEA IPN is smaller than that of PU or PEA; and in the high elastic state the situation is opposite. The temperature of glass translation (Tg) of PU/PEA IPN is 16.2 degree higher than PU and 30.1 degree higher PEA. The DMA curve of PU/PEA IPN shows that the process of glass translation is a gradual change-the amplitude amplifies gradually; there are no the obvious mutation and initial point of continuous oscillation. Above phenomenon proves that the phase segregation exists in the internal structure of PU/PEA IPN material.更多还原