【摘要】 以纳米碳酸钙(CaCO3)为原料,采用溶胶沉积法制备出具有核/壳结构的纳米CaCO3/SiO2复合粒子,并将其原位有机杂化。用纳米CaCO3/SiO2复合粒子替代部分气相法白炭黑作为硅橡胶的补强填料,采用扫描电子显微镜、拉力试验机、热失重仪等对改性硅橡胶的力学性能和热稳定性能进行表征。结果表明:有机杂化剂的种类不同,纳为CaCO3/SiO2复合粒子对硅橡胶的补强效果不同;与用未杂化的纳米CaCO3/SiO2复合粒子取代部分气相法白炭黑的硅橡胶相比,用经A-151杂化的复合粒子取代部分气相法白炭黑的硅橡胶,其拉伸强度、断裂伸长率得到明显改善,耐热性也得到提高;但撕裂强度大大降低。同时还发现,硅橡胶的力学性能及耐热性能在很大程度上也与复合粒子的取代量有关;即使是经KH-570杂化的复合粒子,当取代量小于10%时,其硅橡胶的性能也优于全部用气相法白炭黑补强的硅橡胶。更多还原

【Abstract】 CaCO₃/SiO₂ composite nano particles with core-shell structure were prepared by sol-gel precipitation process,and were organically in-situ hybridized.The CaCO₃/SiO₂ composite nano particles was used as amplifying material to replace partial silica particles in silicone rubber.The mechanical properties and the thermal stability of silicone rubber thus prepared were characterized by SEM,pulling experiments machine and heat loses machine.The CaCO₃/SiO₂ nano particles modified with different in-situ organic reagents further improved the mechanical properties and thermal stability of silicone rubber.Compound particle hydridized with A-151 showed the most improvement,while compound particle hydridized with KH-570showed less improvement.It was also found that the mechanical properties and thermal stability of silicone rubber were also affect by the amount of CaCO₃/SiO₂ composite nano particles.When less than 10% of the silica particles were substituted with KH-570 hybridized compound particle,the performances of silicone rubber were better than the silicone rubber modified by the fumed silica.更多还原