文献类型：期刊文献

英文题名：Preparation and characterization of a polydimethylsiloxane-modified, epoxy-resin-based polyol dispersion and its crosslinked films

作者：Liu, Di[1] Wu, Guo-Min[1,2] Kong, Zhen-Wu[1,2]

通信作者：Wu, GM[1];Kong, ZW[1];Wu, GM[2];Kong, ZW[2]

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

年份：2017

卷号：134

期号：1

外文期刊名：JOURNAL OF APPLIED POLYMER SCIENCE

收录：;EI(收录号：20163902857704);Scopus(收录号：2-s2.0-84988589525);WOS:【SCI-EXPANDED(收录号:WOS:000384673900008)】；

基金：The authors gratefully acknowledge the financial support of the 948 Project of the State Forestry Administration of China (contract grant number 2015-4-43).

语种：英文

外文关键词：coatings; polyurethanes; surfaces and interfaces; thermosets

摘要：Waterborne polydimethylsiloxane-modified epoxy-resin-based polyol dispersions were synthesized by the reaction of 2,4-toluene diisocyanate with 2,2-bis(hydroxymethyl) propionic acid, hydroxypropyl-terminated polydimethylsiloxane (HTPDMS), and bisphenol A epoxy resin based polyol. These HTPDMS-modified polyol dispersions exhibited a small particle size and an excellent dispersion stability. Two-component waterborne polyurethane (2K-WPU) was prepared from the HTPDMS-modified polyol dispersion and a hydrophilic-modified polyisocyanate. The structure of the HTPDMS-modified polyol and its crosslinked 2K-WPU films (SEFs) were characterized with Fourier transform infrared and NMR spectroscopies. The effects of the HTPDMS content on the mechanical and thermal properties of the resulting SEFs were investigated. The results show that the thermal stability of the crosslinked SEFs was enhanced with increasing HTPDMS content, whereas the modulus, tensile strength, and pencil hardness values of the films decreased with increasing HTPDMS content. Siloxane segments migrated onto the surface during the film-formation process. The contact angle of the films increased from 71 to 96 degrees, and the water absorption ratio of the films decreased from 6.6 to 5.0% when the HTPDMS content in the films increased from 0 to 10%. These results indicate that the water resistance of the films was enhanced by the introduction of HTPDMS into the 2K-WPU networks. (c) 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44342.