膨胀计法测聚合物玻璃化转变温度实验关键问题分析  

Analysis of Key Issues in the Experiment of Measuring the Glass Transition Temperature of Polymers Using Dilatometer

作　　者：范吉昌 徐亚娟 FAN Ji-chang;XU Ya-juan(Department of Material Science and Engineering,Luoyang Institute of Science and Technology,Luoyang 471023,China)

机构地区：[1]洛阳理工学院材料科学与工程学院,洛阳471023

出　　处：《高分子通报》2024年第10期1499-1502,共4页Polymer Bulletin

基　　金：河南省实验教学研究项目(项目号2020JYZD-02)。

摘　　要：玻璃化转变温度(T_(g))是高分子物理中一个重要概念,标志着链段由运动状态到冻结状态的转变温度,它是衡量非结晶聚合物使用温度的重要指标。膨胀计法测定聚合物玻璃化转变温度实验有助于学生加深对玻璃化转变的认识和对自由体积理论的理解,但是在实验教学过程中经常遇到实验失败的情况。本文从实验数据出发,分析了影响该实验的主观和客观两方面的关键问题,并提出了分别用丙三醇和乙二醇作指示液时提高实验成功率的措施,供高分子材料与工程专业师生参考。The glass transition temperature(T_(g))is an important concept in polymer physics,marking the transition from the mobile state to the frozen state of polymer chain segments.It also serves as a crucial indicator for measuring the operating temperature of non-crystalline polymers.The dilatometry method for determining the Tg of polymers is helpful for students’deepened understanding of the glass transition and the“free volume theory”.However,experimental failures are often encountered during the teaching process.Based on the experimental data,this article analyzed the two key issues that affect the experiment,both objectively and subjectively,and proposed different measures to improve the success rate of the experiment when using glycerol and ethylene glycol as filling reagents,respectively.This article aims to provide a reference for teachers and students in the major of the polymer materials and engineering.

关 键 词：高分子物理实验 膨胀计 玻璃化转变温度 

分 类 号：G642[文化科学—高等教育学] O631.2[文化科学—教育学]