【摘要】 用γ-（2,3-环氧丙氧基）丙基三甲氧基硅烷（GPTMS）对SiO₂表面进行修饰,再引入苯胺合成聚苯胺（PANI）接枝的SiO₂溶胶（SiO₂@PANI）,经乙烯基三甲氧基硅烷（VTMS）原位包埋后得到SiO₂@PANI/VTMS复合溶胶。讨论了反应温度和引发剂用量对SiO₂@PANI的分散稳定性、粒径、复合涂层接触角以及防腐蚀性能的影响,通过FTIR、SEM表征了SiO₂@PANI粒子的结构与形貌。结果表明,GPTMS改性的SiO₂有利于苯胺通过氨基与环氧基的反应均匀地在其表面接枝聚合,得到以SiO₂为核和PANI为壳的核壳型SiO₂@PANI溶胶。当反应温度10℃,n（APS）/n（An）=0.75时,SiO₂@PANI溶胶具有良好的水分散,电导率达到3.8×10^-2S/cm,以其制备的SiO₂@PANI/VTMS复合溶胶可以直接涂在镁锂合金（Mg-Li）表面形成疏水涂层,涂层水接触角高达135.7°;涂层对Mg-Li合金具有优异的防腐蚀性能,其电化学阻抗值达到2.3×10⁴Ω·cm²,腐蚀电流密度仅为7.51×10^-7A/cm²。更多还原

【Abstract】 Polyaniline（ PANI） grafting silica（ SiO₂）（ SiO₂@PANI） sol was firstly synthesized by a grafting reaction between aniline and SiO₂ sol modified by γ-glycidoxypropyltrimethoxysilane（ GPTMS）,and then the resulting SiO₂@PANI sol was in situ embedded with vinyl trimethoxysilane（ VTMS） to afford SiO₂@PANI/VTMS composite sol. The effects of reaction temperature and dosage of initiator on the dispersion stability and particle size of SiO₂@PANI sol,as well as contact angle and corrosion resistance of the coatings were discussed. The structure and morphology of SiO₂@PANI particles were characterized by Fourier transform infrared（ FTIR） spectroscopy and scanning electron microscopy（ SEM）. The results showed that GPTMS modified SiO₂ could promote the uniform polymerization of aniline on the surface of SiO₂ by the reaction between the amino group and epoxy group. The core-shell type SiO₂@PANI sol was obtained using SiO₂ and PANI as core and shell,respectively. The SiO₂@PANI sol exhibited good water dispersion stability when the reaction temperature is 10 ℃ and n（ APS）/n（ An）= 0. 75,and conductivity is up to 3. 8 × 10^-2S/cm. The prepared SiO₂@PANI/VTMS composite sol could form hydrophobic coatings by coating it on the surface of magnesium-lithium（ Mg-Li） alloy directly,and the water contact angle of the composite coating reached 135. 7°. In addition,the coating exhibited an excellent corrosion resistance performance to Mg-Li alloy,the electrochemical impedance value was 2. 3 × 10⁴Ω·cm²and the corrosion current density was only 7. 51 × 10^-7A/cm².更多还原