Effect of the type of organic modifier on the polymerization kinetics and the properties of poly(methyl methacrylate)/organomodified montmorillonite nanocomposites
Effect of the type of organic modifier on the polymerization kinetics and the properties of poly(methyl methacrylate)/organomodified montmorillonite nanocomposites
复制标题
DOI：
10.1016/j.eurpolymj.2011.11.004
复制
发表时间：
2012-02-01
影响因子：
6
通讯作者：
Karayannidis, George P.
中科院分区：
文献类型：
--
作者：
Nikolaidis, Alexandros K.;Achilias, Dimitris S.;Karayannidis, George P.
本研究成功制备了一系列有机改性蒙脱土（OMMT），如烷基铵盐插层改性蒙脱土（AA-MMT）、烷基季铵盐插层改性蒙脱土（AP-MMT）、烷基季铵盐插层改性蒙脱土（SAA-MMT）、烷基季鏻盐插层改性蒙脱土（SAP-MMT）等。研究了有机蒙脱土（OMMT）中纳米填料用量和有机改性剂种类对原位本体聚合法合成聚甲基丙烯酸甲酯（PMMA）/OMMT纳米复合材料的影响。通过X射线衍射和透射电子显微镜研究了所得纳米复合材料的结构和形态特征，表明剥离更容易发生在具有少量AA-MMT和SAA-MMT的纳米复合材料的情况下。动力学研究结果表明，AA-MMT的存在促进了聚合动力学，而AP-MMT起着阻滞剂的作用。纳米填料的存在和OMMT含量的增加增加了所有纳米复合材料的热稳定性，如通过热重分析测量的，以及通过凝胶渗透色谱法测量的它们的平均分子量。拉伸性能的测量结果表明，所有纳米复合材料的杨氏模量增加沿着与极限应变的减少，而拉伸强度的变化，无论剥离的程度。(C)2011爱思唯尔有限公司版权所有。
A series of organomodified montmorillonite clays (OMMTs) such as intercalated modified montmorillonite with alkylammonium or alkylphosphonium salts (AA-MMT or AP-MMT) and double modified MMT with alkylammonium or alkylphosphonium salts and silane coupling agent (SAA-MMT or SAP-MMT) was successfully prepared in this study. The effect of the amount of nanofiller and type of organic modifier of the OMMT on poly(methyl methacrylate) (PMMA)/OMMT nanocomposites synthesized by in situ bulk polymerization was investigated. The structural and morphological characteristics of the obtained nanocomposites were studied by means of X-ray diffraction and transmission electron microscopy, indicating that exfoliation is more likely to occur in case of nanocomposites with small amounts of AA-MMT and SAA-MMT. The kinetic study results showed that the presence of AA-MMT enhances polymerization kinetics, while AP-MMT acts rather as a reaction retarder. The presence of the nanofiller and the augmentation of the OMMT content increased the thermal stability of all nanocomposites, as measured by thermogravimetric analysis, as well as their average molecular weight measured by gel permeation chromatography. Measurements of the tensile properties revealed that the Young's modulus increased for all nanocomposites along with a decrease of the ultimate strain, while the tensile strength varied regardless of the extent of exfoliation. (C) 2011 Elsevier Ltd. All rights reserved.