ppcpu化学共混物的制备和性能研究毕业论文.doc

PPC/PU化学 共混物的制 备和性能研 究  PAGE 36 PPC/PU化学共混物的制备和性能研究 摘 要 本文采用乙二胺与碳酸丙烯酯开环反应，制备出羟基封端的聚合物—聚碳酸亚丙酯(PPC)，再加入甲苯-2,4-二异氰酸酯(TDI)和聚醚(220)在搅拌作用下扩链固化，一步法生成聚碳酸亚丙酯聚氨酯(PPC/PU)的化学共混物。 本文研究了碳酸丙烯酯和乙二胺在不同摩尔配比(2:1,4:1,6:1,8:1,10:1)条件下发生开环反应来制备PPC。再选用聚醚与PPC混合（PPO/PPC的比为25wt%，30wt%，35wt%，40wt%，45wt%），随后加入TDI固化制备出PPC/PU的化学共混物(NCO/OH的摩尔比为1.3:1,1.5:1,1.7:1,1.8:1)。碳酸丙烯酯和乙二胺在温度80℃下反应2个小时，再加入一定质量分数的聚醚，之后加入定量的TDI在60℃反应2个小时，之后在80℃下固化24小时，制备出化学共混物PPC/PU。对固化产品的力学性能进行了测定。结果表明，在原料8:1的配比及聚醚质量分数为35%的不同TDI比例下生成的PPC/PU化学共混物有较高的断裂伸长率和适宜的拉伸强度，是一种弹性较好的高分子合金材料。 关键字：二氧化碳，开环聚合，聚碳酸亚丙酯，力学性能 Research on the Synthesis and Properties of Polypropylene Carbonate/ Polyurethane Chemical Blends Abstract By using ethylenediamine as catalyst, propylene carbonate was polymerized by ring-open reaction to prepare hydroxy-terminated polymer which is polypropylene carbonate(PPC) .Then adding the toluene - 2, 4 - diisocyanate (TDI) and polyether (220) in PPC to extender chain, the chemical blend of polypropylene carbonate and polyurethane (PPC/PU) was prepared. This paper investigated the propylene carbonate and ethylenediamine with different molar ratio (2:1,4:1,6:1,8:1,10:1) to prepare PPC by occuring ring-open polymerization. The PPC mixed with polyether（the mass ratio of PPO/PPC is 25%, 30%, 35%, 40%, 45%）,and then mixed with TDI ( the molar ratio of NCO/OH is 1.3:1,1.5:1,1.7:1,1.8:1) to prepare the chemical blend of PPC/PU. The condition of ring-open polymerization was that the reaction time was 2 hours and the temperature is 80℃. Then adding polyether in PPC and mixing with TDI to reaction of 2 hours , the chemical blend of PPC/PU was prepared at the temperature of 60℃. The PPC/PU was solidified 24 hours at the temperature of 80℃ . The breaking elongation and strength of products was measured. The results showed that the prepared PPC/PU have a higher breaking elongation and appropriate tensile strength at the ratio 8:1 of raw material , so PPC/PU were better flexible polymer alloy materials. Key words: carbon diox