矿物粉体的表面能及对硅橡胶增强作用的影响  

Surface Energy of Mineral Fine Powders and Its Influence on Reinforcing Effect upon Silicone Rubber

作　　者：胡东红[1] 吴季怀[1] 沈振[1] 魏从容[1] 赵煌[1] 

机构地区：[1]华侨大学材料物理化学研究所

出　　处：《岩石矿物学杂志》1998年第2期173-178,共6页Acta Petrologica et Mineralogica

基　　金：国家自然科学基金

摘　　要：采用平衡接触角法测定了几种矿物粉体及硅橡胶基体的表面能，对矿物／硅橡胶的界面张力、平衡粘附功等热力学参数进行了计算，分析探讨了矿物填料／硅橡胶之间界面相互作用与复合材料力学性能的关系，提出粘附功（Ｗａ）与界面张力（γＳＬ）的比值（Ｗａ／γＳＬ）是衡量矿物填充硅橡胶的力学性能的一个重要参数。The surface characteristics of mineral fine powders will affect the reinforcement effect of mineral filler upon silicone rubber matrix, and the interfacial interaction between mineral filler and silicone rubber matrix will be the mechanical properties of silicone rubber filled with mineral fine powder. Using double liquid method the authors measured the equilibrium contact angles of the surface modified and surface_unmodified mineral fine powders of talc, quartz, granular wollastonite, fibrous wollastonite, kaolinite and ground CaCO 3. According to Fowkes' and Young's theory, the surface energy of the above mineral fine powders were calculated. The results show that surface energies, dispersion components and polar components are different for different mineral fine powders caused by differentce in composition, structure and surface group for different mineral powders. After surface modification of mineral powders, their surface energy will decrease, and the extent of decrease of surface energy will be affected by kinds and concentrations of coupling agents. Based on the surface energy, the interfacial tension ( γ SL ) and the adhesive work (W a) between mineral fillers and silicone rubber were calculated. Analyzing and comparing W a , γ SL and tension strength ( σ B) of mineral powder silicone rubber composite materials reveal that there exists positive correlation between (W a/ γ SL ) and ( σ B). In other words, the larger (W a/ γ SL ) the composite materials, the stronger the interfacial interaction between mineral fillers and silicone rubber matrix, the better the mechanical properties of composite materials. It is belived that the rule is suitable not only to unmodified and modified mineral powders in silicone rubber matrix but also to other rubber matrix. The paper has also made a deepgoing theoretical and experimantal analysis of this rule.

关 键 词：矿物粉体 表面能 硅橡胶 增强作用 

分 类 号：TQ333.93[化学工程—橡胶工业] P574.12[天文地球—矿物学]