无规剥离结构环氧树脂/粘土纳米复合材料的制备及剥离机理  

Preparation of Disorderly Exfoliated Epoxy/Clay Nanocomposites and Mechanism of Exfoliation

作　　者：陈斌[1] 冯静[1] 郭丹[1] 陈非[1] 赵丽萍[2] 张学全[2] 

机构地区：[1]沈阳化工大学材料科学与工程学院,辽宁沈阳110142 [2]中国科学院长春应用化学研究所,吉林长春130022

出　　处：《高分子材料科学与工程》2013年第3期154-157,共4页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(20974064);辽宁省教育厅科学研究项目(2009A590)

摘　　要：用质子化的2,4,6-三(二甲氨基甲基)苯酚(DMP-30)通过阳离子交换反应对原始粘土进行修饰,采用一种与新的制备方法——"湿粘土加入法"合成了环氧树脂/粘土纳米复合材料。透射电镜(TEM)观察显示,粘土片层以3-5片为聚集单元均匀、无规地分布在整个环氧树脂的基体中,呈现高度、无规剥离形态。利用X射线衍射(XRD)跟踪了粘土片层在复合材料制备过程各阶段的分散状况,初步阐明了粘土片层在环氧树脂中的剥离机理:粘土片层在固化反应之前已经实现了在环氧预聚体中的剥离。有机改性剂带有的亲水基团及能与环氧树脂反应的叔胺基对形成剥离结构纳米复合材料有决定性作用。A approach to prepare epoxy-clay nanocomposites was developed. 2,4,6-Tris-（dimethylaminomethyl） phenol （DMP-30） was first protonated and then employed as a surfactant for modification of pristine Na＋-clay through cation exchange reaction. The wet organoclay paste from water suspension, instead of being dried up as usual, was first washed by acetone to remove the water between interlayers of the modified clay, then directly blended with epoxy resin and cured with Jeffamine D230. Transmission electron microscopy （TEM） observation at lower magnification displays that the clay particles are uniformly distributed in the entire epoxy matrix. A closer observation of the morphology at high magnification shows that the clay platelets highly and disordered exfoliate in epoxy-clay nanocomposite with the form of very thin tactoic consisted of few clay layers. The mechanism of delamination of clay layers in the epoxy matrix was revealed by monitoring the exfoliated process of the clay platelets in the formation of epoxy/clay nanocomposites with wide angle X-ray diffraction （XRD）. Clay platelets were exfoliated before the curing reaction of epoxy. The hydrophilic groups and the tertiary amine groups of organic modifier play key roles in the formation of highly and disordered exfoliated epoxy-clay nanocomposite.

关 键 词：环氧树脂 粘土 纳米复合材料 剥离 改性剂 

分 类 号：TB383[一般工业技术—材料科学与工程]