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将甲苯二异氰酸酯(TDI)、聚碳酸酯型二元醇(PCDL)和二乙醇胺为原料合成的一种AB2型化合物作为单体;通过逐步升温法使AB2型单体间相互反应合成了一种超支化聚氨酯(HPU);然后将羟基硅油接入超支化聚氨酯合成了有机硅改性超支化聚氨酯(HPU-Si)。采用红外光谱、核磁碳谱对聚合物的支化结构进行了表征。将HPU-Si作为增容剂加入聚氨酯/硅橡胶共混体系对其进行界面增容改性。利用扫描电镜观察共混物的界面微观结构,结果表明,HPU-Si显著改善了聚氨酯与硅橡胶间相容性。与空白样相比,当聚氨酯/硅橡胶共混比为80:20、HPU-Si为2份时,共混物的拉伸强度,断裂伸长率和撕裂强度得到显著提高,提高幅度分别为59.9%、63.9%和30.2%。
An AB2 type compound synthesized from toluene diisocyanate (TDI), polycarbonate diol (PCDL) and diethanolamine was used as a monomer. A series of AB2 monomers were synthesized through a stepwise temperature-rising method Hyperbranched polyurethane (HPU) was synthesized. Then, silicone-modified hyperbranched polyurethane (HPU-Si) was synthesized by incorporating hydroxyl silicone into hyperbranched polyurethane. The branched structure of the polymer was characterized by FTIR and NMR. HPU-Si as a compatibilizer added to the polyurethane / silicone rubber blend system to interface compatibilization. The interfacial microstructure of the blend was observed by scanning electron microscopy. The results showed that HPU-Si significantly improved the compatibility between polyurethane and silicone rubber. Compared with the blank sample, when the blend ratio of polyurethane / silicone rubber is 80:20 and HPU-Si is 2, the tensile strength, elongation at break and tear strength of the blend are significantly increased, respectively 59.9%, 63.9% and 30.2%.