文献类型：期刊文献

英文题名：Preparation and properties of thermoset composite films from two-component waterborne polyurethane with low loading level nanofibrillated cellulose

作者：Wu, Guo-min[1,2] Liu, Gui-feng[1,2] Chen, Jian[1] Kong, Zhen-wu[1,2]

第一作者：吴国民

通信作者：Wu, GM[1];Kong, ZW[1]

机构：[1]Chinese Acad Forestry, Inst Chem Ind Forest Prod, Key Lab Biomass Energy & Mat Jiangsu Prov,Natl En, Key & Open Lab Forest Chem Engn,State Forestry Ad, Nanjing 210042, Jiangsu, Peoples R China;[2]Chinese Acad Forestry, Res Inst New Technol, Beijing 10091, Peoples R China

年份：2017

卷号：106

起止页码：170-176

外文期刊名：PROGRESS IN ORGANIC COATINGS

收录：;EI(收录号：20170803369184);Scopus(收录号：2-s2.0-85013080250);WOS:【SCI-EXPANDED(收录号:WOS:000399521700020)】；

基金：The authors gratefully acknowledge the financial support from Fundamental Research Funds of Jiangsu Key Lab. of Biomass Energy and Material (contract grant number: JSBEM-S-201505).

语种：英文

外文关键词：Two-component waterborne polyurethanes; Nanofibrillated cellulose; Nanocomposite film; Thermoset

摘要：Thermoset nancomposite films were prepared from a two-component waterborne polyurethane (2K-WPU) incorporated with different contents of high aspect ratio nanofibrillated cellulose.(NFC). Effects of NFC addition on viscosity and particle size distribution of the 2K-WPU dispersion were investigated by rotational rheometer and laser particle size analyzer, respectively. Viscosities of the 2K-WPU/NFC dispersions increased sharply and particle sizes of the 2K-WPU/NFC dispersions increased slightly with the increase of NFC content. Fractography images from scanning electron microscopy (SEM) showed rough structures appearing in the nancomposites structure, which corresponded to the microphase separation between NFC nano-filler and the 2K-WPU matrix. This microphase separation phenomenon led glass transition temperature (Tg) and break elongation Of the 2K-WPU/NFC nanocomposite films decreased with the increase of NFC content. Tensile tests and dynamic mechanical analysis (DMA) indicated all the 2K-WPU/NFC nanocomposite films showed simultaneous enhancements in modulus and tensile strength, compared with those for the neat 2K-WPU (0 vvt%). The enhancements can be attributed to strong interactions resulting from the formation, of hydrogen bonds and chemical grafting between NFC nano-filler and the 2K-WPU matrix. (C) 2016 Elsevier B.V. All rights reserved.