偶联改性TiO_2在PDMS海绵体中的镶嵌型负载

The Load of OTMS Modified TiO_2 Particles on PDMS Sponge at a Mosaic State

纳米TiO_2经辛基三甲氧基硅烷(OTMS)硅烷锚固改性后与端乙烯基硅油、含氢硅油及Karstedt催化剂在甲苯介质中混合均匀,并加入蔗糖粒子模板后加热进行双组份硅油的硅氢加成反应;通过交联固化生成聚二甲基硅氧烷(PDMS),浸泡去除蔗糖粒子模板后制得PDMS/OTMS-TiO_2复合海绵。红外和元素分析结果表明:OTMS易锚固于纳米TiO_2粒子表面,且锚固密度可调。扫描电镜观察发现TiO_2以镶嵌形式负载于海绵体表面,且在高TiO_2含量时易在海绵体壁材表面堆积形成微纳结构。紫外可见分光光度计测量海绵体模板浸泡液中TiO_2含量结果显示:绝大部分OTMS改性TiO_2可牢固负载于聚硅氧烷海绵中。以氙灯模拟日光条件,发现所制海绵具有良好的光催化性能。

After OTMS anchored modification, TiO2 nanoparticles were evenly mixed with vinyl- terminated silicone （viPDMS）, hydrogen silicone （PMHS） and Karstedt catalyst in methylbenzene medium. Meanwhile, hydrosilylation reaction of vinyl-terminated silicone （viPDMS） and hydrogen silicone （PMHS） was conducted in the presence of saccharose particle template. PDMS was generated through cross-linking and solidification. After saccharose particle template was removed through soaking, PDMS/ OTMS-TiO2 composite sponge was gained. Fourier transform infrared spectroscopy （FTIR） and elemental analysis results show that OTMS is easy to be anchored on the surface of nano-TiO2 particles, and its anchoring density on TiO2surface can be regulated. Scanning electron microscope （SEM） morphology of sponges shows that TiO2 particles are loaded on the surface of sponges at a mosaic state. Especially, a micro-nano structure forms on the surface of sponge when the content of TiO2 particles is high. The ultraviolet and visible spectrophotometer was used to measure the content of TiO~ particles in the sponge template soak solution. The result indicates that most TiO2 particles modified by OTMS can be firmly loaded on polysiloxane sponge. Xenon lamp was applied to simulate the sunlight. It is found that the sponge prepared has good photoeatalytic performance.