含联苯结构环氧树脂/蒙脱土纳米复合材料的制备及其固化反应动力学

Preparation and Curing Reaction Kinetics of Epoxy Resin Containing Biphenyl Structure/Montmorillonite Nanocomposites

采用含联苯结构环氧树脂3,3',5,5'-四甲基联苯二酚二缩水甘油醚(TMBP)与层间距为2.33 nm的有机蒙脱土(O-MMT)进行插层复合,并选用芳香型固化剂4,4'-二氨基二苯甲烷(DDM),制备了TMBP/DDM/MMT纳米复合材料.采用非等温差示扫描量热法(DSC)研究该体系的固化反应动力学,求得其表观活化能ΔE=51.25 kJ/mol,反应级数为0.88.采用X射线衍射(XRD)研究蒙脱土的质量分数对其在环氧树脂中的插层及剥离行为的影响.结果表明:只有在蒙脱土的质量分数较低时才能得到剥离型纳米复合材料;性能测试数据表明,该复合材料具有较高的拉伸强度、弯曲模量、冲击强度和较高的玻璃化转变温度.

A new type of epoxy resin containing biphenyl structure/organo-montmorillonite nanocomposites was reported,which was based on 3,3′,5,5′-tetramethyl-diphenoldiglycidyl ether and O-MMT.The interlayer spacing of the O-MMT,corresponding to the d（001） plane peak was 2.33 nm.The curing reaction kinetics of the TMBP/MMT system was studied by means of non-isothermal DSC.Based on the Kissinger method,the apparent activation energy（Δ E） was calculated to be 51.25 kJ/mol.The reaction order（n=0.88） was calculated according to Crane theory.The influences of the content of O-MMT on the intercalation and exfoliation structures of TMBP/DDM/MMT composites were investigated by wide X-ray diffraction（WXRD）.The X-ray patterns reveal that only at the lower content of O-MMT,could the exfoliation nanocomposites be formed.The mechanical and thermal properties of the composites were measured.The results indicate that the composites have better mechanical properties and higher Tg than the pristine epoxy resin.