Analysis of Key Issues in the Experiment of Measuring the Glass Transition Temperature of Polymers Using Dilatometer
The glass transition temperature(Tg)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.
Polymer physics experimentDilatometryGlass transition temperature
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