【摘要】 通过分析PTT的红外光谱随温度变化的情况,研究了PTT在等速升温过程中的结晶行为和分子链 构象的转变。发现随着温度上升,显示结晶的谱带略有增强,分子链中丙二醇单元的构象发生了转变:中间 的两个碳碳键由反式构象向旁式构象转变,同时两边的两个碳氧键由旁式构象转变为反式构象。更多还原

【Abstract】 The variation of infrared spectrum of poly(trimethylerie terephthalate) (PTT) versus temperature was analyzed to study the crystalline behavior and molecular chain conformation transformation of PTT during annealing process. The crystalline bands were found to be enhanced with the temperature. The conformation of propandiol segments in the polymer chain changed, that is to say, the inner two carbon-carbon bonds transformed from transoid conformation to gauche conformation while the two side carbon-oxygen bonds transformed from gauche conformation to transoid conformation.更多还原