核心期刊网首页> 中文期刊> 工业技术

Effect of external shearing force on exfoliation structure and properties of high-performance epoxy clay nanocomposites


To further investigate the influence of organic modifiers (primary amine with catalytic hydrogen and quaternary alkylammonium salt) on exfoliation behavior of clay tactoids, high-speed emulsifying and homogeneous mixing(HEHM) and ball milling were used to exert external shearing force on two organic clay tactoids (termed as MMTDDA and MMTDBDA, respectively), which were organically modified with DoDecyl Amine(DDA) and Dodecyl Benzyl Dimethyl Ammonium chloride(DBDA) ,respectively. The effects of external shearing force on microstructure and properties of both resultant nanocomposites were investigated by X-ray diffractometry(XRD), transmission electron microscopy(TEM) and thermogravimetric analysis(TGA). The results show that whether the clay tactoids are organically modified with catalytic primary amine or quaternary alkylammonium salt, the large agglomerates will not be finely dispersed or exfoliated by conventional mixing (magnetic stirring). After being vigorously sheared by HEHM or ball milling, the dispersion and exfoliation of clay tactoids are increasingly promoted for both MMTDDA and MMTDBDA, and the mechanical properties of the high-performance epoxy/clay nanocomposites are enhanced. For epoxy/MMTDDA nanocomposites, impact strength can be increased up to 44.5 kJ/m2 from 32.1 kJ/m2 , which is about 39% higher than that of pristine matrix, and the flexural strength is enhanced by about 4%. A similar enhancement for epoxy/MMTDBDA nanocomposites has also been achieved. Improvement on thermal stability of epoxy/clay nanocomposites is dependent on the exfoliation of clay layers and molecular structure of the modifiers. The onset temperature is increased with the clay loading decreasing from 5% or higher content to 3% (mass fraction), and the DBDA modifier with the heat-resistant benzyl may also improve the stability of epoxy/MMTDBDA nanocomposites.......

【作者名称】: LU Hai-jun, ZHANG Bao-yan, CHEN Xiang-bao
【作者单位】: School of Science, Northwestern Polytechnical University, Xi'an 710072, China, Beijing Institute of Aeronautical Materials, Beijing 100095, China, Beijing Institute of Aeronautical Materials, Beijing 100095, China, Beijing Institute of Aeronautical Materials, Beijing 100095, China
【关 键 词】: shearing force, exfoliation, nanocomposites, epoxy, clay
【期刊名称】: 中国有色金属学报(英文版)
【期刊论文数据库】: [DBS_Articles_01]
【期刊论文编号】: 105,448,789
【摘要长度】: 1,882
【上篇论文】: 中文期刊 - Mechanism on minimization of excess sludge in oxic-settlinganaerobic (OSA) process
【下篇论文】: 中文期刊 - Utility of semivariogram for spatial variation of soil nutrients and the robust analysis of semivariogram

【论文下载】: 免费获取 该期刊&论文全文内容