纳米碳酸钙粒子在硅酮密封胶中的增强作用  

Reinforcement Property in Silicon Sealant by Nano CaCO_3 Particles

作　　者：王跃林[1] 伍青[1] 杜荣昵[2] 王勇 高小铃[2] 傅强[2] 

机构地区：[1]中山大学高分子科学研究所,广州510510 [2]四川大学高分子材料系

出　　处：《高等学校化学学报》2002年第10期2011-2013,共3页Chemical Journal of Chinese Universities

基　　金：国家自然科学杰出青年基金 (批准号 :2 992 5 413 )资助

摘　　要：Reinforcement property of structural silicon sealant as a function of the size and loading of nano CaCO 3 particles has been investigated by mechanical measurement and DMA experiments. The tensile strength and elongation at break of silicone sealant were found greatly enhanced by nano CaCO 3 particles. The smaller the particle size, the higher the tensile strength and the elongation will be. The storage modulus is also remarkably increased with the increasing of CaCO 3 loading and decreasing of CaCO 3 particle sizes, as revealed by DAM. Two relaxation peaks are seen for silicon sealant. One is around 153 K, corresponding to the glass transition temperature(T g), and the other is around 233 K, corresponding to the melting temperature(T m). Both T g and T m increase with the increasing of CaCO 3 loading and decreasing of CaCO 3 particle sizes. DMA results suggest that the interaction between nano CaCO 3 particles and silicon sealant is quite strong. The molecular motion of silicon sealant is highly limited by the dispersed nano CaCO 3 particles.Reinforcement property of structural silicon sealant as a function of the size and loading of nano CaCO 3 particles has been investigated by mechanical measurement and DMA experiments. The tensile strength and elongation at break of silicone sealant were found greatly enhanced by nano CaCO 3 particles. The smaller the particle size, the higher the tensile strength and the elongation will be. The storage modulus is also remarkably increased with the increasing of CaCO 3 loading and decreasing of CaCO 3 particle sizes, as revealed by DAM. Two relaxation peaks are seen for silicon sealant. One is around 153 K, corresponding to the glass transition temperature(T g), and the other is around 233 K, corresponding to the melting temperature(T m). Both T g and T m increase with the increasing of CaCO 3 loading and decreasing of CaCO 3 particle sizes. DMA results suggest that the interaction between nano CaCO 3 particles and silicon sealant is quite strong. The molecular motion of silicon sealant is highly limited by the dispersed nano CaCO 3 particles.

关 键 词：密封胶 硅酮结构胶 纳米碳酸钙粒子 增强作用 粘度 强度 

分 类 号：TQ436.6[化学工程]