聚己内酯二醇/聚四氢呋喃聚醚二醇并用比对混炼型聚氨酯性能的影响

Effect of PCL/PTMG Blending Ratios on Properties of MPU

以聚己内酯二醇(PCL)和聚四氢呋喃醚二醇(PTMG)并用作为软段单体、二苯基甲烷二异氰酸酯为硬段单体,合成混炼型聚氨酯(MPU)。保持硬段含量不变,研究PCL/PTMG并用比(质量比)对MPU性能的影响。结果表明:随着PTMG用量的增大,MPU的玻璃化温度降低;MPU硫化胶的拉伸强度、拉断伸长率和撕裂强度均先增大后减小,DIN磨耗量增大,热氧老化后的拉伸强度和拉断伸长率降幅明显增大;当PCL/PTMG并用比为90/10时,MPU硫化胶的拉断伸长率和撕裂强度最大,分别为518%和66 kN·m^(-1);仅采用PCL的MPU硫化胶的DIN磨耗量最小,为0.0144 cm^(3)。

Using polycaprolactone glycol(PCL)and polytetramethylene ether glycol(PTMG)as the soft segment monomer and diphenylmethane diisocyanate as the hard segment monomer,a millable polyurethane(MPU)was synthesized.Keeping the content of hard segment unchanged,the effects of PCL/PTMG blending ratios(mass ratios)on properties of MPU were studied.The results showed that,with the increase of PTMG dosage,the glass transition temperature of MPU decreased,the tensile strength,elongation at break and tear strength of MPU vulcanizate increased firstly and then decreased,the DIN abrasion increased,and after thermo-oxidative aging,the tensile strength and elongation at break decreased significantly.When PCL/PTMG blending ratio was 90/10,the elongation at break and tear strength of MPU vulcanizate reached the maximum,which were 518%and 66 kN·m^(-1),respectively.The DIN abrasion of the MPU vulcanizate with PCL only was the smallest,0.0144 cm^(3).