低熔点PET-PTMG共聚醚酯的合成与表征  

Synthesis and characterization of low-melting point PET-PTMG copolyether ester

作　　者：张爱丽[1] 罗东[1] 林农[1] 李文刚[1] 

机构地区：[1]东华大学材料学院纤维材料改性国家重点实验室,上海201620

出　　处：《合成纤维工业》2010年第3期26-28,32,共4页China Synthetic Fiber Industry

摘　　要：将对苯二甲酸二甲酯(DMT)、间苯二甲酸二甲酯(DMI)、乙二醇(EG)、新戊二醇(NPG)进行酯交换反应后,再与聚四氢呋喃醚(PTMG)进行缩聚反应,制得低熔点共聚醚酯。采用傅里叶变换红外光谱(FT-IR)、核磁共振氢谱(1H-NMR)、差示扫描量热分析(DSC)、动态热力学分析(DMA)对共聚醚酯的结构与性能进行了表征。结果表明:在其他条件相同时,随NPG比例的增加,共聚醚酯的粘度增大,其NPG与EG链段比值提高,玻璃化转变温度(Tg)升高。当nDMT:nDMI为1:1,nNPG:nEG为3.3:6.7,PTMG质量分数为31.9%时,制得的共聚醚酯的Tg为25.79℃,熔点约130℃;35℃时,共聚醚酯贮能模量最大,耐热性能较好。A low-melting point copolyether ester was prepared by the esterification of dimethyl terephthalate （ DMT）, dimethyl isophthalate （ DMI）, ethylene glycol （EG） and neopentyl glycol （NPG） prior to the condensation with polytetrahydrofuran glycol （PTMG）. The structure and properties of the copolyether ester were characterized by Fourier transform infrared spectroscopy （FTIR）, hydrogen nuclear magnetic resonance spectroscopy （^1H-NMR）, differential scanning calorimetry （DSC） and dynamic mechanical thermal analysis （DMA）. The results showed that the viscosity of the copolyether ester, the segment ratio of NPG and EG and the glass transition temperature （ Tg ） were raised while increasing the proportion of NPG under the same other conditions. The obtained copolyether ester had Ts of 25.79 ℃ and the melting point about 130 ℃ as nDMT ：nDMI and nNPG ： NEG were 1 ： 1 and 3.3 ： 6.7, respectively, and the mass fraction of PTMG was 31.9%. The copolyether ester had the maximal storage modulus and the fairly good thermal property at 35 ℃.

关 键 词：聚酯 聚四氢呋喃醚 共聚醚酯 熔融缩聚 合成 结构 

分 类 号：TQ320[化学工程—合成树脂塑料工业]