环氧树脂玻璃化转变温度与分子量关系研究  

Research on the Glass Transition Temperature and Molecular Weight of Epoxy Resin

作　　者：刘伟 Liu Wei(Bamstone New Materials Technology(Wuhan)Co.,Ltd.,Hubei,430113)

机构地区：[1]百思通新材料科技(武汉)有限公司,湖北430113

出　　处：《当代化工研究》2024年第22期59-61,共3页Modern Chemical Research

摘　　要：玻璃化转变温度(Tg)是高分子材料重要的固有属性,现阶段预测Tg与分子量之间的关系的理论模型主要有Fox-Flory公式。在研究环氧树脂的Tg与分子量关系时,发现Fox-Flory公式不够精确。通过合成一系列不同分子量的双酚A型环氧树脂,探讨了其分子量与Tg之间的具体关联;基于自由体积理论和分子末端效应,对Fox-Flory公式进行修正,推导出新的Tg预测公式;并通过实验进行了验证。研究结果表明,新公式在较大范围内具备更高的拟合精度,为以环氧树脂为代表的宽分子量分布的聚合物材料的设计提供了理论支持。Glass transition temperature(Tg)is an important inherent property of polymer materials.Currently,the Fox-Flory formula is the primary theoretical model used to predict the relationship between Tg and molecular weight.However,when investigating this relationship for epoxy resin,the author found the Fox-Flory formula to be insufficiently accurate.This paper synthesized a series of bisphenol A-type epoxy resins with different molecular weights to explore the specific relationship between molecular weight and Tg.By applying free volume theory and considering molecular end effects,the Fox-Flory formula was modified to derive a new Tg prediction formula,which was subsequently validated through experiments.The research findings indicate that the new formula offers higher fitting accuracy across a broader range,providing theoretical support for the design of polymer materials with wide molecular weight distribution represented by epoxy resin.

关 键 词：玻璃化转变温度 Fox-Flory公式 自由体积理论 分子末端效应 

分 类 号：TB332[一般工业技术—材料科学与工程]