Preparation and characterization of polysiloxane-modified epoxy resin aqueous dispersions and their films

被引:3
|
作者
Ding, L
Wang, GY
Hu, CP [1 ]
Sen Wu, S
机构
[1] Minist Educ, Key Lab Ultrafine Mat, Shanghai 200237, Peoples R China
[2] E China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China
关键词
epoxy resin; polysiloxane; aqueous dispersion; surface; thermal property;
D O I
10.1002/app.22192
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Polysiloxane-modified epoxy resin aqueous dispersions were prepared by the reaction of amino-polysiloxane (APS) with a graft epoxy resin that was synthesized with a diglycidyl ether of bisphenol A type epoxy resin and styrene/acrylic acid. The measurements of the epoxy values and FTIR spectra confirmed that this reaction really took place. The modified aqueous dispersion exhibits high viscosity, small particle size, and nearly the same surface tension as the unmodified one. Therefore, this indicates that the siloxane segments could be encapsulated into graft epoxy resin particles during the water dispersion process. For APS-modified films, the thermal stability and water resistance are remarkably enhanced. Furthermore, lowering of the hardness and surface tension for these films was also observed and the surface composition was measured by X-ray photoelectron spectroscopy. The experimental data indicate that the siloxane segments easily migrate onto the surface during the film formation process and finally enrich on the surface of the APS-modified film. (c) 2005 Wiley Periodicals, Inc.
引用
收藏
页码:880 / 885
页数:6
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