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研究了（蓖麻油－聚乙二醇）聚氨酯／聚（苯乙烯－甲基丙烯酸甲酯－甲基丙烯酸）（ＰＵ／Ｐ（Ｓｔ－ＭＭＡ－ＭＡＡ））互穿聚合物网络（ＩＰＮ）．动态力学性能及透射电镜结果均表明该体系相分离较严重；ＩＰＮ具有两个玻璃化转变温度，它们有不同程度的内移，形成一定程度分子水平的混合，而ＩＰＮ（５０／５０）其分子混合水平较大，互穿缠结程度较高。形成ＩＰＮ后，其力学性能得以改善。透射电镜结果表明，聚氨酯网的交联密度直接影响ＩＰＮ的相区尺寸。形成ＩＰＮ后热稳定性提高，易于降解断链的Ｓｔ－ＭＭＡ－ＭＡＡ单体起到了自由基消除剂的作用。
(Castor Oil-Polyethylene Glycol) Polyurethane / Poly (Styrene-Methyl Methacrylate-Methacrylate) (PU / P (St-MMA-MAA) Interpenetrating Polymer Network (IPN) was studied. Both the dynamic mechanical properties and the transmission electron microscopy results show that the phase separation is more serious. IPN has two glass transition temperatures, they have different degrees of internal migration, forming a certain degree of molecular mixing, and IPN (50/50) molecules The level of mixing is larger, and the degree of interweaving entanglement is higher. The formation of IPN, its mechanical properties can be improved. Transmission electron microscopy results show that the crosslink density of polyurethane network directly affects the phase size of IPN. St-MMA-MAA monomer, which is easy to degrade chain scission, acts as a free radical scavenger after forming IPN.