通过预聚体法,以聚四氢呋喃醚二醇(PTMG-1000)、4,4'-二环己基甲烷二异氰酸酯(HMDI)、3,3'-二氯-4,4'-二氨基二苯基甲烷(MOCA)、二甲硫基甲苯二胺(DMTDA)为主要原材料,合成不同PTMG质量含量的聚氨酯弹性体(PUE)。采用红外光谱仪(FT-IR)、X射线衍射仪(XRD)、差示量热仪(DSC)和力学性能测试等手段研究了PTMG质量含量对PUE的羰基氢键化程度、结晶度、玻璃化转变温度(Tg)、耐低温性、模量等的影响。结果表明:PUE中大部分—NH参与构成氢键,并且PUE-43的氨基氢键化指数最高,PTMG质量含量最高的PUE-70中羰基氢键化指数、微相分离程度、耐低温性、结晶性均最佳,Tg最低。在PUE-49时力学性能最好。
Polytetrahydrofuran ether glycol (PTMG-1000),4,4'-dicyclohexylmethane diisocyanate (HMDI),3,3'-dichloro-4,4'-diaminodiisocyanate phenylmethane (MOCA) and dimethylthiotoluenediamine (DMTDA) used as the main raw materials,polyurethane elastomers (PUE) with different PTMG contents were synthesized by prepolymer method.The effects of PTMG mass contents on the carbonyl hydrogen bonding degree,crystallinity,glass transition temperature (Tg),low temperature resistance and modulus of PUE were studied by means of FT-IR,XRD,DSC,and mechanical property testing.The results showed that most of —NH in PUE participates in forming hydrogen bonds,and PUE-43 had the highest amino hydrogen bonding index.PUE-70 with the highest PTMG content had carbonyl hydrogen bonding index,degree of microphase separation,low temperature resistance,the crystallinity was the best,and the Tg was the lowest.The best mechanical properties were obtained at PUE-49.
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基金资助
山东省自然科学基金青年基金项目(ZR2020QE072);山东省科技型中小企业创新能力提升工程项目(2021TSGC1153)
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