聚己内酯和大侧基侧链型液晶高分子的嵌段共聚物合成与表征

Synthesis and Characterization of Rod-coil Block Copolymers Containing Poly(ε-caprolactone) and Side-chain Liquid Crystalline Polymers with the Bulk Mesogen Block

摘要: 设计并合成了一系列柔性链段为聚己内酯（PCL），刚性链段为大侧基侧链型液晶高分子（SCLCPs）的刚柔嵌段液晶共聚物，单体和嵌段共聚物化学结构由¹H NMR确认。通过计算¹H NMR的峰面积可知，4种嵌段共聚物的分子量分别为1.46×10⁵ g·mol^-1、1.14×10⁵ g·mol^-1、3.25×10⁴ g·mol^-1、1.21×10⁵ g·mol^-1。从DSC曲线分析可知，柔性链段和刚性链段均有熔点和玻璃化转变，这些热转变的存在，说明了4种刚柔嵌段共聚物存在微相分离结构。

Abstract: A series of rod-coil liquid crystalline block copolymers comprising crystallizable poly(ε-caprolactone) and side-chain liquid crystalline polymers with the bulk mesogen(SCLCPs) were designed and synthesized by ring-opening polymerization of ε-caprolactone and subsequent atom transfer radical polymerization (ATRP),the chemical structures of the monomers and polymers were confirmed by ¹H NMR. The four kinds of block copolymers have got 1.46×10⁵,1.14×10⁵,3.25×10⁴ and 1.21×10⁵ molecular weights by calculation,respectively. The existence of microphase separation was identified by differential scanning calorimetry(DSC) according to the melt point and glass transition temperature.