非等温DSC法研究复合材料用环氧树脂的固化反应  

Study on Curing Reaction of Epoxy used in Composites by Non-isothermal DSC Method

作　　者：丁江平[1] 廖栋[1] 范欣愉[1] 

机构地区：[1]中国科学院宁波材料技术与工程研究所,宁波315201

出　　处：《材料导报》2011年第14期139-143,共5页Materials Reports

基　　金：宁波市自然科学基金(2010A610188)

摘　　要：采用非等温DSC研究了一种复合材料用环氧树脂体系的固化反应。采用n级反应模型和Malek等转化率法确定了固化反应动力学方程,通过外推法优化其固化工艺,测试优化后工艺下制备的树脂浇铸体的固化度和力学性能。结果表明,n级反应模型与实验值差别较大;采用Malek等转化率法判断固化反应按自催化反应机理进行,在2.5～15℃/min升温速率下,自催化模型计算曲线与实验曲线吻合较好;优化确定其固化工艺为70℃/2h+110℃/2h,在该工艺下制备的浇铸体固化度达98.51%,拉伸强度和弯曲强度分别为75.11MPa和128.10MPa。The curing processing of one epoxy system used in composites was studied by non-isothermal differential scanning calorimetry（DSC） at different heating rates. The curing kinetic mechanism function and the kinetic parameters were determined using n order reaction and isoeonversional method given by Malek respectively. The curing processing was optimized by extrapolation method, then it tested the degree of curing reaction and the mechanical properties of the casing bodies prepared in the curing processing. The results indicated that the n order model deviates significantly from experimental data. While the isoconversional method showed that the curing reactions process followed an autocatalytic reaction, and the DSC curves from the autoeatalytic model can well agree with that of experiment in the range of 2. 5-15℃/min. The curing processing was determined as 70℃ for 2h, and then 110℃ for 2h. The degree of curing reaction of the casting bodies reaches 98. 51%, and tensile strength and flexure strength of the casting bodies are 75. 11MPa and 128. 10MPa, respectively.

关 键 词：环氧树脂 非等温DSC 固化反应 动力学模型 固化工艺 

分 类 号：TQ323.5[化学工程—合成树脂塑料工业]