摘要
采用原位乳液聚合法,以硅烷偶联剂表面修饰的纳米TiO2与苯乙烯(St)、丙烯酸酯、有机氟单体(DFMA)为原料,合成了具有核壳结构的有机-无机杂化纳米TiO2/含氟苯丙复合乳液。探讨了乳化剂、DFMA和TiO2用量对复合乳液性能的影响,并通过粒径分析、接触角、傅里叶红外光谱(FT-IR)、热重(TG)、差示扫描量热仪(DSC)及透射电子显微镜(TEM)等方法对复合乳液和乳胶膜的结构及性能进行了表征。结果表明,由于纳米TiO2与DFMA的协同作用,涂膜的疏水性和耐热性能得到了较大提高,纳米TiO2/含氟苯丙复合粒子的平均粒径为100nm左右,当DFMA和TiO2用量分别为14%和2%(质量百分数)时,涂膜-空气界面对去离子水的接触角达112.3°,乳胶膜的表面能低至15.21mN/m。
The core-shell organic/inorganic hybrid nano-TiO2/styrene-acrylate emulsion containing fluorine was successfully synthesized by in-situ emulsion polymerization,using nano-Ti02 treated with silane coupling agent,styrene（St）,acrylate and organofluorine monomer（DFMA） as main materials. The influence of the amount of emulsifier, DFMA and TiO2 on emulsion properties was discussed,and the structure and properties of composite emulsion and their films were characterized by particle size analysis, contact angle （CA）, Fourier transform infrared spectrum （FT-IR）, thermogravimetry （TG） analysis, differential .scanning calorimetry（DSC） and transmission electron microscope （TEM）. The results indicated that the hydrophobieity and thermal stability of the latex films were greatly improved, to some extent, owing to the synergistic effect of DFMA and nano TiO2. The composite particles appeared core-shell structure with about 100 nm of average particle size,and water contact angle for film-air interface is 112.3° and the surface free energy is as low as 15.21 mN/m when the amount of DFMA and TiO2 are 14% and 2% （mass percent）, respectively.
出处
《新型建筑材料》
北大核心
2011年第1期43-47,共5页
New Building Materials
基金
国家自然科学基金项目(20476035,20876065)
关键词
TIO2
核壳结构
含氟苯丙复合乳液
疏水性
有机-无机杂化
原位乳液聚合
TiO2
core-shell structure
styrene-acrylate emulsion containing fluorine
hydrophobicity
organic/inorganic hybrid
insitu emulsion polymerization
