显微红外热分析PTT的非等温结晶过程  

Thermal analysis of the non-isothermal crystallization process of PTT using FTIR microspectroscopy

作　　者：宋亮[1] 吴彤[1] 吴丝竹[1] 吴刚[1] 

机构地区：[1]北京化工大学材料科学与工程学院,北京100029

出　　处：《北京化工大学学报（自然科学版）》2005年第2期50-54,共5页Journal of Beijing University of Chemical Technology(Natural Science Edition)

摘　　要：采用显微红外光谱技术在较宽的温度范围内,同步跟踪聚对苯二甲酸丙二酯(PTT)的冷却过程,研究了PTT分子中各基团对结晶过程的贡献。从计算得到的各特征基团的表观焓变ΔH可知,PTT中苯环和乙二醇(—O—CH2—CH2—CH2—O—)的各种振动模式的能量状态变化对PTT的结晶过程有不同程度的贡献。Thermal spectra of poly(trimethylene terephthalate) were collected over a temperature range of 250～40?℃ by FTIR microspectroscopy. Conformational apparent enthalpy differences ΔH in the crystallization process were calculated by Van't Hoff equation at a constant pressure and plotted with temperature. The analysis shows that the energy state changes of benzene ring and the trimethylene glycol unit (O-CH_2-CH_2-CH_2-O) of PTT at the crystal temperature range give different contributions to crystallization of PTT.

关 键 词：聚对苯二甲酸丙二酯(PTT) 非等温结晶过程 显微红外光谱 表观焓变△H 

分 类 号：TQ317.3[化学工程—高聚物工业] TQ342.29