热固性树脂固化过程热膨胀与收缩系数测量装置  

Measuring device for thermal expansion coefficient and shrinkage rate during cure process of thermosetting resin

作　　者：梁群 冯喜平[1] 张坤[1] 李建[2] 侯晓[1] Liang Qun;Feng Xiping;Zhang Kun;Li Jian;Hou Xiao(School of Astronautics,Northucestern Polytechnical University,Xi'an 710072,China;Xi'an Aerospace Composite Research Institute,Xi'an 710025,China)

机构地区：[1]西北工业大学航天学院,西安710072 [2]西安航天复合材料研究所,西安710025

出　　处：《仪器仪表学报》2022年第7期35-43,共9页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(U1837601)项目资助。

摘　　要：由于热固性树脂固化过程中固化度、热膨胀和固化收缩之间强耦合,常规仪器无法测量热膨胀系数和固化收缩率。为解决这一问题,基于PVT-α法开发了热膨胀系数与固化收缩率测量装置。通过热流传感器和热电偶确定反应热和固化温度,积分反应热确定固化度;通过位移传感器确定体积变化。将体积变化与固化度变化相结合,解耦热膨胀和固化收缩体积,实现热膨胀系数与固化收缩率的测量。为验证装置可行性,测量了硅橡胶材料的热膨胀系数,误差为4.93%。对热固性树脂(环氧树脂E-51)进行了固化过程热膨胀系数和固化收缩率测量,热膨胀系数随固化度α呈线性变化:CTE_(cross)(α)=8.2651×10^(-4)(1-α)+7.5664×10^(-4)α(1/℃),固化收缩率为1.87%。本文开发的装置可以为热固性树脂固化过程热膨胀系数和固化收缩率测量提供手段。It is difficult for conventional instrument to measure the thermal expansion coefficient and shrinkage rate of thermosetting resin because of the strong coupling among cure degree, thermal expansion and chemical shrinkage volume during cure process. To solve this problem, a measuring device is designed with reference to the PVT-α method. The reaction heat and cure temperature are obtained through the heat flow sensor and thermocouple of the device. Then, the cure degree of thermosetting resin sample can be determined by the integral of reaction heat. The volume change of thermosetting resin sample is determined by the displacement sensor. Combining the volume change with the evolution of cure degree, the thermal expansion and cure shrinkage volume during cure process are decoupled to obtain the thermal expansion coefficient and the shrinkage rate at the same time. By using this device, the thermal expansion coefficient of silicone rubber material is measured. Compared with the standard value, the error is 4.93%, which verifies the feasibility of the device. The thermal expansion coefficient of thermosetting resin(epoxy resin E-51) during cure is measured, which decreases with the cure degree linearly, with the expression: CTE_(cross)(α)=8.265 1×10^(-4)(1-α)+7.566 4×10^(-4)α(1/℃), and the shrinkage rate is determined at the same time, with the value of 1.87%. The developed device in this article provides a method for measuring the thermal expansion coefficient and shrinkage rate of thermosetting resin during cure.

关 键 词：PVT-α 热膨胀系数 固化收缩率 固化 热固性树脂 

分 类 号：TB94[一般工业技术—计量学] TH873[机械工程—测试计量技术及仪器]