端羟基环氧乙烷–四氢呋喃共聚醚的合成与表征

Synthesis and characterization of hydroxyl-terminated ethylene oxide-tetrahydrofuran copolyether

以磷钨酸为催化剂,1,4–丁二醇(BDO)为起始剂,引发环氧乙烷(EO)与四氢呋喃(THF)开环共聚制备了端羟基环氧乙烷–四氢呋喃共聚醚(PET)。利用傅里叶变换红外(FTIR)光谱、核磁共振氢谱(^(1)H–NMR)、凝胶渗透色谱(GPC)、差示扫描量热(DSC)仪对产物的结构和性能进行了表征。实验结果表明,共聚醚产物相对分子质量在806~3 815,分子量分布指数在1.21~1.66,玻璃化转变温度低于–80℃;通过萃取、静置沉降、吸附、水洗等后处理步骤得到色浅透明的产品。以PET为原料合成了具有理想力学性能的聚氨酯弹性体。

The hydroxyl-terminated ethylene oxide-tetrahydrofuran copolyether(PET)was prepared by ring-opening copolymerization of ethylene oxide(EO)and tetrahydrofuran(THF)using phosphotungstic acid as catalyst and 1,4-butanediol(BDO)as initiator.The structure and performance of the products were characterized by Fourier transform infrared(FTIR)spectrum,nuclear magnetic resonance hydrogen spectrum(^(1)H-NMR),gel permeation chromatogram(GPC)and differential scanning calorimeter(DSC).The experimental results showed that the relative molecular mass of the copolyether products was in the range of 806~3815,the molecular weight distribution index was in the range of 1.21~1.66,and the glass transition temperature was below-8o℃.The light-colored and transparent products were obtained through the post-treating steps of extraction,static sedimentation,adsorption,water washing and so on.The polyurethane elastomer with ideal mechanical performance was synthesized using PET as raw material.