质子酸催化制备三嵌段稳定剂PCL-PDMS-PCL

Synthesis of tri-block stabilizer PCL-PDMS-PCL with protonic acid catalyst

以羟丙基封端的聚二甲基硅氧烷(HTPDMS)为引发剂,氯化氢/乙醚溶液(HCl·Et_2O)为质子酸催化剂引发ε-己内酯开环聚合,成功制备了三嵌段稳定剂——聚己内酯-聚二甲基硅氧烷-聚己内酯(PCL-PDMSPCL)嵌段共聚物。采用傅里叶变换红外光谱仪和核磁共振氢谱仪对所制嵌段共聚物进行了表征,并讨论了反应条件对PCL-PDMS-PCL相对分子质量和产率的影响。结果表明:合成的分子与目标分子结构一致;最佳反应条件是,反应温度25℃,反应时间4 h,n(HCl·Et_2O)∶n(HTPDMS)为2∶1。

Tri-block stabilizer of poly(ε-caprolactone)-polydimethylsiloxane-poly(ε-caprolactone)blockcopolymer(PCL-PDMS-PCL)was synthesized via ring-opening polymerization of PCL with hydroxypropylterminatedPDMS(HTPDMS)as the initiator and hydrogen chloride/ether solution(HCl·Et2O)as protonicacid catalyst.The copolymer was characterized by Fourier transform infrared spectroscope(FTIR)andnuclear magnetic resonance spectrometer(NMR).The impact of reaction conditions on the relative molecularweight and yield of the copolymer were observed as well.The results show that the structure of the preparedmolecules are uniform with that of the target molecule.The optimal reaction conditions are listed as follows,reaction temperature is25℃,reaction time is4h,and the molar ratio of HCl·Et2O and HTPDMS is2∶1.