Preparation and physical properties of styrene-acrylonitrile copolymer/montmorillonite nanocomposites

• Main Author: 楊席珍
• Other Authors: 吳震裕
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/39903005343328549719

碩士 === 國立中興大學 === 材料工程學研究所 === 88 === Abstract The preparation of styrene-acrylonitrile/MMT nanocomposite was done by quasi-emulsion polymerization in adsorbed cetyl trimethylammonium bromide (CTAB) micelles on MMT. Various amounts of MMT in SAN/MMT nanocomposites were prepared. The samples were analyzed by XRD、TGA to obtain d-spacing of MMT and content of MMT. The low MMT content SAN/MMT composites were prepared by two methods. One is by bulk polymerization, the other is done in a Brabender mixer. The measured E'、E'' and tanδ of SAN/MMT nanocomposites by Dynamic Mechanical Analyzer was compared with those of pure SAN copolymer. Then, XRD、TEM were employed to observe the d-spacing and dispersion of MMT in SAN matrix. Results show that the SAN/MMT nanocomposites can be prepared by bulk polymerization and melt blending. And, MMT was dispersed in SAN uniformly. The storage modulus (E') of SAN/MMT composites are higher than those of pure SAN with an increase percentage of 72 % and 61 % , respectively. Both the d-spacing of the SAN/MMT nanocomposites were measured to be greater than 200~300 nm from TEM. In this study, we have successfully prepared SAN/MMT nanocomposites with mechanical properties improved by MMT reinforcement.