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合成了一系列液体氯丁二烯-甲基丙烯酸羟乙酯共聚物(CP-HEMA)聚氨酯-聚苯乙烯互穿网络聚合物(PU-ST-IPN)。表征了物理性能和密度行为。密度效应在体系中较为明显,其增值为0.030g/cm~3,同时其抗张强度的提高也是显著的。通过60％PU透射电镜照片,观察了微相分离形态结构。分散于PU相中的ST微区尺寸大约为500-4000A。与PU-MMA-IPN体系比较,该体系相界分明,相分离程度大。直到60％PU,没有相转变发生,ST相是分散相,PU相是连续相。形成PU相的相对反应速率比苯乙烯的聚合速度快是造成上述现象的主要原因。微区尺寸分布和密度效应证明,此IPN体系在分散相的界面上两个网络是互穿缠结的。
A series of liquid chloroprene-hydroxyethyl methacrylate copolymer (CP-HEMA) polyurethane-polystyrene interpenetrating polymer networks (PU-ST-IPN) were synthesized. Characterized physical properties and density behavior. Density effect in the system is more obvious, the added value of 0.030g / cm ~ 3, while its increase in tensile strength is also significant. Through the 60% PU transmission electron micrograph, the morphological structure of the micro-phase separation was observed. The size of the ST micro-domains dispersed in the PU phase is about 500-4000A. Compared with the PU-MMA-IPN system, this system has a distinct phase boundary and a large degree of phase separation. Up to 60% PU, no phase transition occurs, the ST phase is dispersed, and the PU phase is the continuous phase. The relative reaction rate of formation of PU phase is faster than the polymerization of styrene is the main reason for the above phenomenon. The micro-size distribution and density effect prove that the two networks of IPN are interpenetrating tangles at the interface of dispersed phase.