酯侧链长度对丙烯酸酯聚合物/蒙脱土复合物制备及其改性天然乳胶的影响  

Effect of Length of Ester Alkyl Side Chain on Preparation of Acrylic Polymer/Montmorillonite and Their Latex Blends with Natural Rubber

作　　者：郑钊君 田晓慧[1] 孙金煜[1] 冯屏 赵伟如 史馨兰 

机构地区：[1]华东理工大学超细材料制备与应用教育部重点实验室,上海200237

出　　处：《华东理工大学学报（自然科学版）》2017年第6期769-776,共8页Journal of East China University of Science and Technology

基　　金：国家高技术研究发展项目(2009AA035002);上海市重点学科(B502)和重点实验室项目(08DZ2230500);中央高校基本科研业务费(22A201514002)

摘　　要：制备了3种丙烯酸酯聚合物/蒙脱土复合物。采用傅里叶红外光谱、X射线衍射仪和透射电子显微镜测试表征了这3种复合物的结构和形貌。用这3种复合物改性天然乳胶后发现:相比纯聚合物改性薄膜,聚合物/蒙脱土复合物改性薄膜的拉伸强度、撕裂强度、变形性能、变形回复性能更好,同时硬度更小,其中含有最长酯侧链的复合物改性薄膜的力学性能最优。全反射红外和扫描电子显微镜测试结果表明酯侧链长度的增加能改善蒙脱土在橡胶相中的分散程度,提高复合物与天然乳胶之间的相容性。热重分析测试表明随着酯侧链长度的增加,其合成的复合物改性薄膜的耐热稳定性能逐步提高。Three acrylic polymer-montmorillonite(MMT)nanocomposites were synthesized by in situ emulsion polymerization and then blended with natural rubber(NR)latex.The structure and morphologies of these nanocomposites were investigated by Flourier transform infrared spectroscopy,X-ray diffractograms and transmission electron microscope,respectively.Compared to those modified by NR/acrylic polymer,NR/acrylic polymer-MMT films possess the improved tensile and tear strength,deformation and deformation recovery properties as well as lower hardness.Moreover,for the nanocomposites with longest ester side chain the modified films showed the best mechanical properties.Attenuated total reflection Flourier transformed infrared spectroscopy and scanning electron microscopy indicated that the increase in the length of ester alkyl side benefited the dispersion of MMT among natural rubber phase and improved the compatibility between NR matrix and acrylic polymer-MMT phase.Results of thermogravimetric analyses showed that the heat resistance temperature of NR/acrylic polymer-MMT films was gradually increasing upon increasing the length of ester side chain.

关 键 词：天然乳胶 酯侧链结构 蒙脱土 

分 类 号：TQ331.2[化学工程—橡胶工业]