文献类型：期刊文献

英文题名：Highly transparent and scratch resistant polysiloxane coatings containing silica nanoparticles

作者：Li, Yongqiang[1];Zhang, Ling[1];Li, Chunzhong[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Engn Res Ctr Hierarch Nanomat, Key Lab Ultrafine Mat,Minist Educ, Shanghai 200237, Peoples R China

年份：2020

卷号：559

起止页码：273

外文期刊名：JOURNAL OF COLLOID AND INTERFACE SCIENCE

收录：;EI(收录号：20194207555561);WOS:【SCI-EXPANDED(收录号:WOS:000502421500029)】；

基金：This work was supported by the National Natural Science Foundation of China (51673063, 21878092, 21838003, 91834301), the Shanghai Scientific and Technological Innovation Project (18JC1410500), Program of Shanghai Academic Research Leader (19XD1401400), the Innovation Program of Shanghai Municipal Education Commission, the Fundamental Research Funds for the Central Universities (222201718002).

语种：英文

外文关键词：Polysiloxane; Silica nanoparticles; Coatings; Scratch resistance; Transparency

摘要：Scratch properties of polysiloxane coatings are critical to their application in the many fields which require long-term protection and aesthetics. In this work, modified silica nanoparticles (m-SiO2) containing epoxy group dispersed homogeneously in polysiloxane coatings by in situ polymerization process. The homogeneous dispersion of m-SiO2 is beneficial to the scratch resistance, which has only slight effect on the transparency of polysiloxane coatings. According to the results of macro and nano scratch tests, the first critical loads for polysiloxane coating with 0.75 wt% m-SiO2 were improved 66.7% and 73.3% respectively compared to pure polysiloxane coating. More impressively, the achieved coating also showed an outstanding transmittance of 91%, a high pencil hardness of 8H and a superior hardness of nanoindentation test (HIT), which was about 58.3% higher than pure coating. Additionally, the thermostability and abrasion resistance of the nanocomposite coatings were enhanced with various loadings of m-SiO2. This study provides a facile and environmentally friendly method to reinforce scratch resistance of highly transparent polysiloxane nanocomposite coating, which is potential in the application of automobiles and home appliances. (C) 2019 Elsevier Inc. All rights reserved.