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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。
The dynamic thermo-mechanical properties of polyurethane / polyacrylate interpenetrating polymer network (PU / PEAIPN) were investigated by dynamic thermo-mechanical method (DMA) and compared with those of pure PU and PEA Thermal mechanical properties for comparison. The results show that the amplitude of DMA curve of PU / PEAIPN is lower than that of pure PU and PEA under the glass transition temperature. The amplitude of DMA curve of IPN is larger than that of pure PU and PEA when fully entering the high elastic state. The glass transition temperature of PU / PEAIPN is 16% higher than that of PU and PEA. 2 and 30. 1 degree; the relaxation time of the glass transition process is extended by 211. 2 and 381. 6 seconds. The DMA curve of PU / PEAIPN showed its glass transition to continuous gradual change. The amplitude of the curve gradually increased, and there was no obvious point of change and the starting point of equal amplitude oscillation. After the second glass transition was completed, the DMA curve Appear more regular periodic oscillations, the two relaxation process almost even as one. The results also show that due to the thermodynamic incompatibility of PU and PEA, there is a considerable degree of phase separation inside the PU / PEAIPN material.