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采用预聚体法合成了以异佛尔酮二异氰酸酯(IPDI)、聚醚多元醇等为主要原料,1,4-丁二醇(BDO)、三羟甲基丙烷(TMP)、1,2-丙二醇(PDO)、三异丙醇胺(TIPA)为扩链交联剂的聚氨酯弹性体PUE,讨论了扩链交联剂对弹性体拉伸强度、断裂伸长率、硬度、损耗因子、微相分离、吸水率等性能的影响规律。结果表明:随R值增加,PUE硬度增加,交联密度越大,分子规整性越高,硬度越大;相同R值下,不同硬段结构的PUE储能模量E’和tanδ变化趋势一致,Tg(SS)几乎不变,但tanδmax变化较大;相同R值下,交联密度越大,硬段链段规整性越高,内聚能越大,拉伸强度越大,吸水率越低,断裂伸长率越小,微相分离程度越大。
The main raw materials of isophorone diisocyanate (IPDI), polyether polyol and the like, 1,4-butanediol (BDO), trimethylolpropane (TMP) - propylene glycol (PDO) and triisopropanolamine (TIPA) as the polyurethane elastomer PUE, the effects of chain extension agent on the tensile strength, elongation at break, hardness, loss factor, Micro-phase separation, water absorption and other properties of the law. The results show that the hardness of PUE increases with the increase of R value, and the higher the crosslinking density is, the higher the molecular regularity is and the higher the hardness is. With the same R value, the storage elastic modulus E ’and tanδ of different hard segment structures are consistent , Tg (SS) almost does not change, but tanδmax changes greatly. Under the same R value, the higher the crosslinking density, the higher the regularity of the hard segment, the larger the cohesion energy, the greater the tensile strength, the more the water absorption rate Low, the smaller the elongation at break, the greater the degree of micro-phase separation.