聚四氢呋喃醚二醇脂肪族超支化聚氨酯的合成及表征

摘要

The isocyanate-terminated polyurethane prepolymer (PPU) was synthesized by step-growth polymeri-zation using polytetramethylene ether glycol (PTMG, MN = 2000) with isophorone disocyanate (IPDI) as the monomers, dibutyltin dilaurate (DBTDL) as the catalyst. The appropriate reaction conditions were optimized by single factor experiments as follows. The reaction temperature was 75℃ , the reaction time was 1. 5h and the quantity of catalyst was equal to 0. 007% of feedstocks. And then the hyperbranched polyurethane (HBPU) was synthesized by graft copolymerization using isocyanate-terminated polyurethane prepolymer (PPU) and hy-perbranched poly (amide-ester) polyol (HPAE) as the raw materials. The appropriate reaction conditions were optimized by single factor experiments as follows. The reaction temperature was 75℃ , the reaction time was 4. 5h. The molecular structure of the monomers of PPU and HBPU were characterized by FT-IR. The thermal stability of PPU and HBPU were characterized by thermogravimetry.%利用聚四氢呋喃醚二醇(PTMG,Mn=2000)和异佛尔酮二异氰酸酯(IPDI)为原料,以二月桂酸二丁基锡(DBTDL)为催化剂,通过逐步聚合反应合成了 NCO封端的聚氨酯预聚体(PPU),通过单因素实验,根据反应过程中异氰酸酯基团和羟值含量的变化规律,优化出了PPU的合成条件:反应温度75℃,反应时间为1.5h,m(DBTDL)=0.007％(以IPDI和PTMG2000的总质量计).再通过接枝使PPU与端羟基超支化聚合物(HPAE)共聚反应制备得到一种新型超支化聚氨酯(HBPU).经过单因素实验分析方法优化出了HBPU的合成条件为反应温度75℃,反应时间4h.分别利用FT-IR和综合热分析对PPU和HB-PU的结构以及热稳定性进行了表征.