混合大二醇基聚氨酯弹性体/环氧树脂互穿网络聚合物的研究

以α,ω-双(γ-羟丙基)聚二甲基硅氧烷(BHPDMS)和聚氧四甲基二醇(PHMO)混合大二醇作为软链段,首先通过两步溶液聚合法合成了-NCO封端的混合大二醇基聚氨酯(PU)弹性体预聚物(PUT);然后以PUT和环氧树脂(EP)预聚物为原料、1,3-双(γ-氨丙基)-1,1,3,3-四甲基二硅氧烷(BATS)为交联剂,采用同步溶液聚合法合成了PUT/EP互穿聚合物网络(PUT/EP I PN)。使用傅里叶红外光谱(FT-I R)法、动力学分析(DMA)法和扫描电子显微镜(SEM)法,对PUT和PUT/EP I PN进行分析和表征,并对其力学性能和表面疏水性进行测试。实验结果表明,PUT/EP I PN中不存在宏观相分离状态,仅发生微观相分离状态;当PUT/EP I PN中w(PUT)=50%时,PUT/EP I PN具有优异的综合力学性能和表面疏水性。

Study on polyurethane elastomer based on mixed macrodiol/epoxy resin interpenetrating polymer network

With mixing macrodiol of α,ω-bis(γ-hydroxypropyl) polydimethylsiloxane(BHPDMS) and poly(hexamethyleneoxide)(PHMO) as soft segment,firstly NCO-terminated polyurethane(PU) elastomer prepolymer based on mixing macrodiol(PUT) was prepared by two-step solution polymerization,then with PUT and epoxy resin(EP) prepolymer as raw materials and 1,3-bis(γ-aminopropyl)-1,1,3,3-tetramethyldisiloxanemethylene(BAST) as curing agent,the PUT/EP interpenetrating polymer network(PUT/EP IPN) was synthesized by simultaneous solution polymerization method.The PUT and PUT/EP IPN were analyzed and characterized by Fourier transform infrared spectrometry(FT-IR),dynamic thermal analysis(DTA) and scanning electron microscopy(SEM),and their mechanical property and surface hydrophobic property were tested.The experimental results showed that the PUT/EP IPN had excellent synthetical mechanical property and surface hydrophobic property when mass fraction of PUT was 50% in PUT/EP IPN,there was not macroscopical only microscopical phase separation in PUT/EP IPN.