【摘要】 以对苯二甲酸二甲酯(DMT)、乙二醇(EG)和聚氧丁撑(PTMO)为原料进行共聚合,得到无规嵌段共聚物PET/PTMO。核磁共振(1H—NMR)分析表明PTMO按投料比以化学连接的方式接到了聚合物大分子链上;DSC的结果表明PET/PTMO的熔点随PTMO含量的增加而降低,其自熔体冷却时的结晶温度Tc在PTMO含量小于8%(摩尔比)时向高温移动,而在PTMO含量为12%(摩尔比)时则小于PET的Tc;通过POM观察到,PET/PTMO所形成的球晶尺寸明显减小。将试样注塑成样条,进行抗冲击性能的测试后,发现PET/PTMO的冲击强度远大于PET,选择添加4%~8%摩尔分数的PTMO,即能显著改善韧性。更多还原

【Abstract】 The modified poly（ethylene terephthalate） was prepared from the copolymerization of dimethyl terephthalate（DMT）,ethylene glycol（EG） and poly（teremethylene oxide）（PTMO）.The result of（）¹H—NMR showed that PTMO was chemically linked into the macromolecular chains of the polymer,hence the random block copolymers PET/PTMO were obtained.The melting and crystalline behavior of PET/PTMO were investigated by differential scanning calorimetry（DSC）, polarized optical microscopy（POM） and SPM.It was found that the melting points of PET/PTMO decreased with the increscent of PTMO content,and the cooling crystalline temperature T_c of PET/PTMO shifted to higher temperature while lower PTMO was added（less than 8% mole ratio）.The spherulites with smaller size were observed in PET/PTMO than that of in PET,and the more content of PTMO,the smaller size of the spherulites.The impact strength without notch of PET/PTMO showed greatly improved,4% mole ratio of PTMO incorporation made a value of impact strength of 104（）kJ·m^-2,while the value of PET was only(7.8 kJ·m^-2.)更多还原