文献类型：期刊文献

英文题名：Preparation and properties of super hydrophobic films from siloxane-modified two-component waterborne polyurethane and hydrophobic nano SiO2

作者：Wu, Guomin[1,2] Liu, Di[1] Chen, Jian[1] Liu, Guifeng[1] Kong, Zhenwu[1,2]

第一作者：吴国民;Wu, Guomin

通信作者：Wu, Guomin

机构：[1] Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, National Engineering Lab. for Biomass Chemical Utilization, Key and Open Lab. on Forest Chemical Engineering, State Forestry Administration, Key Lab. of Biomass Energy and Materials, Nanjing, Jiangsu Province, 210042, China; [2] Institute of New Technology of Forestry, CAF, Beijing, 100091, China

年份：2019

卷号：127

起止页码：80-87

外文期刊名：Progress in Organic Coatings

收录：EI(收录号：20184706111406);Scopus(收录号：2-s2.0-85056633243)

语种：英文

外文关键词：Contact angle - Glass transition - Hydrophobicity - Morphology - Nanocomposite films - Nanocomposites - Polyurethanes - Silanes - Silica - Silicon - Silicones - SiO2 nanoparticles - Surface chemistry - Thermodynamic stability

摘要：Nanocomposite films with super hydrophobic surface were prepared by building rough micro/nano structure on the surface of siloxane-modified two-component waterborne polyurethane (2K-WPU) with hydrophobic nano SiO2. Firstly, nano SiO2 prepared by St?ber method with tetraethoxysilane (TEOS) as precursor was modified with trimethylethoxysilane (TMES), in order to cover a layer of hydrophobic methyl groups on the surface of nano SiO2. Then, a series of nanocomposite films with different water contact angles were obtained by adding different contents of TMES modified SiO2 into the siloxane-modified 2K-WPU. The effects of the content of nano SiO2 on the morphology and hydrophobicity of film surface were investigated. The results showed that the surface structures of the nanocomposite films became rougher and the water contact angle of nanocomposite films was increased obviously with the increase of the content of hydrophobic nano SiO2. Super hydrophobic nanocomposite film with water contact angle over 150° was successfully fabricated by using polysiloxane as low surface energy material and hydrophobic nano SiO2 as micro/nano rough structure builder on the polymer surface. Moreover, incorporating nano SiO2 into the 2K-WPU matrix could increase the glass transition temperature and thermal stability of the nanocomposite films. ? 2018 Elsevier B.V.