材料期刊网

以异佛尔酮二异氰酸（IPDI）、聚丙二醇（PPG）、端羟丙基硅氧烷（PDMS）、二羟甲基丙酸（DMPA）及1,4-丁二醇（BDO）为主要原料,采用溶液聚合法合成有机硅改性水性聚氨酯（SiPU）。以SiPU为种子乳液,并作为复合乳液的壳层,加入核层单体丙烯酸丁酯（BA）、甲基丙烯酸甲酯（MMA）及甲基丙烯酸十二氟庚酯（DFMA）,通过乳液聚合得到氟硅改性聚氨酯-聚丙烯酸酯（FSiPUA）复合乳液。考察了PDMS及DFMA用量对乳液聚合过程及乳胶膜表面疏水性能的影响。采用FT-IR、CA、TEM、DSC及TG等表征复合乳液涂膜结构与性能。结果表明,FSiPUA复合乳液呈现核壳结构,在PDMS和DFMA的协同作用下,当PDMS和DFMA用量分别为m（PDMS）/m（PU）=5.5/100和m（DFMA）/m（AA）=15/100时,涂膜的表面自由能低至21.67 mN/m,对去离子水接触角达102.3°,涂膜耐热性有一定提高。

Waterborne siliconated polyurethane（SiPU） was synthesized via solution polymerization using isophorone diisocyanate（IPDI）,polypropylene glycol（PPG） and hydroxypropyl terminated polydimethyl sioxane（PDMS）,dimethylol propionic acid（DMPA） and 1,4-butanediol（BDO） as main materials.Further,a new type of polyurethane-acrylate hybrid emulsion containing siloxane and fluorine（FSiPUA） was synthesized via a seeded emulsion polymerization,in which the core phase consisting of butyl acrylate（BA）,methyl methacrylate（MMA） and dodecafluoroheptyl methacrylate（DFMA）,and the shell phase SiPU.The influence of the amounts of PDMS and DFMA on emulsion polymerization process and the surface properties of the latex was discussed.The structure and properties of the hybrid emulsion were characterized by FT-IR,CA,TEM,DSC and TG analysis.The results indicate that the resultant particles have the core shell structure owing to the synergistic effect of PDMS and DFMA.The surface free energy is as low as 21.67 mN/m and deionized water contact angle for film-air interface is 102.3° when the amount of PDMS and DFMA is m（PDMS）/m（PU）=5.5/100 and m（DFMA）/m（AA）=15/100,respectively.And the thermal stability of the latex films is improved slightly.