显微红外光谱热分析PTT的熔融过程  

THERMAL ANALYSIS OF THE MELTING PROCESS OF PTT USING FT-IR MICRO-SPECTROSCOPY

作　　者：宋亮[1] 吴彤[1] 叶月萍[1] 吴丝竹[1] 吴刚[1] 

机构地区：[1]新型高分子材料制备与加工北京市重点实验室

出　　处：《高分子材料科学与工程》2005年第5期224-227,231,共5页Polymer Materials Science & Engineering

摘　　要：采用显微傅立叶转换红外光谱技术研究了聚对苯二甲酸丙二酯(PTT)的熔融相转变过程.通过采集40 ℃～250 ℃连续程序升温过程的显微红外光谱数据,运用在等压条件下的van′t Hoff关系式推导计算特征基团在升温熔融过程中起点和终点振动的两种能态吸光度比值的变化和振动能态转变的表观焓变(ΔH).研究了PTT分子链段中各基团对熔融过程的贡献.从计算得到的各种特征基团在两种能态吸光度的表观焓变ΔH的数据可知,PTT链段中的各种振动模式对PTT的熔融过程都有不同程度的贡献.Thermal spectra of poly（trimethylene terephthalate）（PTT） were collected over a temperature range of 40℃-250℃ by FT-IR micro-spectroscopy. Conformational apparent enthaIpy differences AH in the crystalline melting process have been calculated by van＇t Hoff equation at constant pressure and plotted with temperature. Many groups of PTT have been investigated in order to find their contributions to the melting process. In comparison with the values of apparent enthalpy AH, it can be seen that the vibration modes related to the trimethylene glycol unit（O-CH2-CH2-CH2-O） of PTT make prominent contribution to the amorphous state of chain segments in the melting process.

关 键 词：聚对苯二甲酸丙二酯 熔融过程 显微红外光谱 表观焓变 

分 类 号：O631.6[理学—高分子化学]