铁掺杂纳米二氧化钛提升铂金催化硅橡胶热稳定性的研究  

Thermal stability improvement of platinum-catalyzed silicone rubber by iron-doped titanium dioxide nanoparticles

作　　者：冯小亚 魏凯杰 胡彦杰[1] Feng Xiaoya;Wei Kaijie;Hu Yanjie(School of Materials,East China Univiersity of Technology,Shanghai 200237)

机构地区：[1]华东理工大学材料科学与工程学院,上海200237

出　　处：《化工新型材料》2024年第12期93-99,共7页New Chemical Materials

基　　金：国家自然科学基金面上项目(21978088)。

摘　　要：采用喷雾火焰燃烧法制备了二氧化钛(TiO_(2))和铁掺杂二氧化钛(Fe-TiO_(2))纳米颗粒,以其作为耐热剂,应用热失重、热失重-气相色谱-质谱联用、热老化前后机械性能变化和全反射红外光谱等方法研究了纳米颗粒对铂金催化硅橡胶热稳定性能的影响规律,探究了纳米颗粒对硅橡胶耐热老化性能的提升机理。结果表明:TiO_(2)和Fe-TiO_(2)纳米颗粒对于铂金催化硅橡胶的端基水解和主链环化降解有显著的抑制效果,Fe-TiO_(2)还可以进一步抑制侧甲基氧化形成的过度交联,因而Fe-TiO_(2)对铂金催化硅橡胶耐热性能的提升效果明显优于TiO_(2)。Nanoparticles of titanium oxide(TiO_(2))and iron-doped titanium oxide(Fe-TiO_(2))were prepared by flame spray pyrolysis(FSP)method.Using the TiO_(2) and Fe-TiO_(2) as heat stabilizers,the thermal stability improvement effect of nanoparticles on platinum-catalyzed methyl-vinyl-silicone rubber was systematically studied with thermal gravimetric analyzer(TGA),TGA and gas chromatography-mass spectrometry(TGA-GC-MS),thermal aging,and attenuated total reflectance-Fourier transform infrared spectrum(ATR-FTIR).The mechanism of thermal stability improvement was also explored.The results showed that TiO_(2) and Fe-TiO_(2) nanoparticles had significant inhibition effect on the end group hydrolysis and main chain cyclization degradation of platinum-catalyzed silicone rubber,and Fe-TiO_(2) further inhibited the excessive crosslinking formed by the oxidation of side methyl.Therefore,the improvement effect of Fe-TiO_(2) on the thermal stability of silicone rubber was much better than that of TiO_(2).

关 键 词：硅橡胶 热稳定性 纳米二氧化钛 耐热剂 

分 类 号：TQ152[化学工程—电化学工业] TM53[电气工程—电器]