界面强度对生物基环氧树脂/粘土纳米复合材料热/力学性能的影响  

Effect of Interfacial Strength on Thermal/Mechanical Properties of Bio-Based Epoxy Resin/Clay Nanocomposites

作　　者：李响 赵鹏 张英[2] 陈斌 Xiang Li;Peng Zhao;Ying Zhang;Bin Chen(School of Materials Science and Engineering,Shenyang University of Chemical Technology;School of Science,Shenyang University of Chemical Technology,Shenyang 110142,China)

机构地区：[1]沈阳化工大学材料科学与工程学院 [2]沈阳化工大学理学院,辽宁沈阳110142

出　　处：《高分子材料科学与工程》2022年第7期45-52,共8页Polymer Materials Science & Engineering

基　　金：辽宁省教育厅2019年度科学研究经费项目(LJ2019008);辽宁省教育厅2021年科学研究经费面上项目(LJKZ0441)。

摘　　要：为了探究不同性质的改性粘土对生物基环氧树脂的增强作用,将2,4,6-三(二甲氨基甲基)苯酚(DMP-30)与2倍摩尔比的溴代正丁烷(BB)反应,制备了保留部分叔胺基的有机改性剂(PPDMP30);再将DMP-30酸化制备了叔胺基全部质子化的改性剂(CPDMP30)。分别用这2种改性剂对原始粘土进行表面处理,得到了2种性质不同的有机化粘土——PP-clay(反应型)和CP-clay(非反应型)。以这2种粘土作为增强体,采用“粘土淤浆复合法”制备了2种界面结合强度不同的腰果酚环氧树脂(NC514s)/粘土纳米复合材料。透射电子显微镜照片显示,PP-clay和CP-clay都以无规剥离的形式均匀地分散在基体中。拉伸测试结果表明,反应型PP-clay因保留了能参与基体树脂固化反应的叔胺基团,在两相间构建起较强的界面作用力,使材料的拉伸强度提升了135%。而非反应型CP-clay仅使材料的拉伸强度提升109%。动态力学热分析结果显示,反应型PP-clay对复合材料T_(g)的提升效果更明显。In order to study the effect of organoclays on mechanical properties of bio-based epoxy/clay nanocomposites,a reactive organic modifier was synthesized via the reaction of bromobutane with 2,4,6-tris-(dimethylaminomethyl) phenol(DMP-30) by controlling the mole ratio(2:1).And a non-reactive modifier,fully protonated DMP30(CPDMP30),was prepared by the acidification of DMP-30.The two organic modifiers were used for the modification of pristine Na+-clay and the two different types of organoclay(reactive PP-clay and non-reactive CP-clay) were prepared.Bio-based epoxy/clay nanocomposites with different interfacial strength were synthesized by using the above two organoclays via the “clay-slurry compounding method”.X-ray diffraction(XRD) and transmission electron microscopy(TEM) images show that the two types of epoxy/clay nanocomposites have nearly the same highly exfoliated microstructure.The tensile test indicate that reactive PP-clay,which can build stronger interfacial strength by chemical reaction,leads to an increase in the tensile strength of the nanocomposites by 135%at 3% organoclay.By contrast,the non-reactive type of CP-clay results in only 109% increase in strength(at the same loading of organoclay).Dynamic mechanical analysis(DMA) show that the glass transition temperature(Tg) of the nanocomposites is marginally improved relative to neat epoxy resin.In comparison,PP-clay is more effective in enhancing Tgof nanocomposites than CP-clay.

关 键 词：生物基环氧树脂 粘土 纳米复合材料 界面强度 

分 类 号：TB332[一般工业技术—材料科学与工程]