摘要
快速准确检测改性聚丙烯玻璃化转变温度对于检验其质量、评价其高温稳定性和可靠性具有重要意义。本文搭建了改性聚丙烯超声检测系统,通过快速升温试验,研究了改性聚丙烯超声信号幅值和加权频率与温度的变化规律。结果表明:在一定温度范围内,随着温度的升高,超声信号幅值变化曲线存在明显的极值,超声信号加权频率变化曲线存在明显的拐点,极值和拐点均与差示扫描量热法(DSC)、热机械分析法(TMA)测试的改性聚丙烯玻璃化转变外推起始温度(Teig)基本一致,推测此现象与改性聚丙烯非结晶结构在高温下的分子链运动和玻璃化转变行为密切相关。本文提出的基于超声幅值与加权频率的改性聚丙烯玻璃化转变温度快速检测方法,可适用于工程现场改性聚丙烯的质量快速检验及其高温稳定性和可靠性的有效评估。
Rapid and accurate detection of the glass transition temperature of modified polypropylene is of great significance for inspecting its quality and evaluating its high-temperature stability and reliability.This paper established an ultrasonic detection system for modified polypropylene and investigated the change law of ultrasonic signal amplitude and weighted frequency with temperature through rapid heating tests.The results show that within a certain temperature range,as the temperature increases,the ultrasonic signal curves exhibit obvious extreme values,while the weighted frequency change curves demonstrate obvious inflection points.Both the extreme values and inflection points are consistent with the extrapolated initial temperature(Teig)of the glass transition of modified polypropylene tested by differential scanning calorimetry(DSC)and thermo-mechanical analysis(TMA).It is speculated that this phenomenon is closely related to the molecular chain movement and glass transition behavior of the amorphous structure of modified polypropylene at high temperature.The proposed rapid detection method for the glass transition temperature of modified polypropylene based on ultrasound amplitude and weighted frequency can be applied to the rapid quality inspection of modified polypropylene in engineering sites and the effective evaluation of its high-temperature stability and reliability.
作者
李成钢
储昭杰
毛丹辰
张建国
LI Chenggang;CHU Zhaojie;MAO Danchen;ZHANG Jianguo(Electric Power Research Institute of State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 211103,China)
出处
《绝缘材料》
北大核心
2025年第12期135-140,共6页
Insulating Materials
基金
国网江苏省电力有限公司科技项目(J2022124)。
关键词
改性聚丙烯
玻璃化转变
超声
时频分析
modified polypropylene
glass transition
ultrasonic
time-frequency analysis
