聚丙烯凝固过程的超声波扫描热学分析  

Ultrasonic Scanning Calorimetry Analysis of Polypropylene Solidification

作　　者：王克俭[1] 郭冰[1] 

机构地区：[1]北京化工大学塑料机械及工程研究所有机无机复合材料国家重点实验室,北京100029

出　　处：《高分子材料科学与工程》2012年第11期113-116,共4页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(51073021);教育部新世纪优秀人才和北京市优秀人才课题

摘　　要：文中建立了超声波和PVT同步检测装置,检测了聚丙烯(PP)的凝固行为。测得了不同压力下超声波振幅或波速与温度关系的曲线,曲线具有相似性,能够定量分析特征结晶温度和压力对结晶的影响。按照温压等效原理,对波速曲线按照固态和液态分别进行归一化处理,发现两态下平移因子不同,结晶区接近固态的;绝对结晶峰温度相对熔融峰温度随压力变化接近指数衰减规律。相对于动态扫描量热学(DSC),超声波扫描热学(USC)直接测量物料,可在高压条件进行测试。The instrument was designed for the simultaneous characterization of the ultrasonic wave and pressure- volume-temperature in the solidification of polypropylene. Ultrasonic amplitude and velocity versus temperature at different pressures quantitatively exhibited the effects of pressure on crystallization. The similar velocity curves were normalized for obtaining the master curve in solid state and melt state respectively in terms of pressure-temperature equivalence principle. The shift factors in two states were different when the crystallization shifting was close to the solid state. The peak temperature in amplitude curve dropped in the exponential decay. Unlike dynamic scanning calorimetry （DSC）, ultrasonic scanning calorimetry（ USC） can perform high pressures measurement directly.

关 键 词：超声波扫描热学 动态扫描量热学 聚丙烯 凝固 压力 

分 类 号：TB553[理学—物理]