PPC/PU化学共混物的制备和性能研究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ResearchontheSynthesisandPropertiesofPolypropyleneCarbonate/PolyurethaneChemicalBlendsAbstractByusingethylenediamineascatalyst,propylenecarbonatewaspolymerizedbyring-openreactiontopreparehydroxy-terminatedpolymerwhichispolypropylenecarbonate(PPC).Thenaddingthetoluene-2,4-diisocyanate(TDI)andpolyether(220)inPPCtoextenderchain,thechemicalblendofpolypropylenecarbonateandpolyurethane(PPC/PU)wasprepared.Thispaperinvestigatedthepropylenecarbonateandethylenediaminewithdifferentmolarratio(2:1,4:1,6:1,8:1,10:1)topreparePPCbyoccuringring-openpolymerization.ThePPCmixedwithpolyether（themassratioofPPO/PPCis25%,30%,35%,40%,45%）,andthenmixedwithTDI(themolarratioofNCO/OHis1.3:1,1.5:1,1.7:1,1.8:1)topreparethechemicalblendofPPC/PU.Theconditionofring-openpolymerizationwasthatthereactiontimewas2hoursandthetemperatureis80℃.ThenaddingpolyetherinPPCandmixingwithTDItoreactionof2hours,thechemicalblendofPPC/PUwaspreparedatthetemperatureof60℃.ThePPC/PUwassolidified24hoursatthetemperatureof80℃.Thebreakingelongationandstrengthofproductswasmeasured.TheresultsshowedthatthepreparedPPC/PUhaveahigherbreakingelongationandappropriatetensilestrengthattheratio8:1ofrawmaterial,soPPC/PUwerebetterflexiblepolymeralloymaterials.Keywords:carbondioxide,ring-openpolymerization,polypropylenecarbonate(PPC),mechanicalproperti目录TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc295903839"摘要PAGEREF_Toc295903839\hIHYPERLINK\l"_Toc295903840"AbstractPAGEREF_Toc29590384