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以碱催化平衡聚合法制备的α,ω-二羟基聚二甲基硅氧烷为基胶制备脱醇型RTV-1阻燃硅橡胶,研究阻燃剂三聚氰胺聚磷酸盐(MPP)用量对脱醇型RTV-1硅橡胶阻燃性能、物理性能和热稳定性能的影响。结果表明:当阻燃剂MPP用量超过30份时,硅橡胶的阻燃性能达到美国ANSI/UL 94—2010标准V-0级。随着阻燃剂MPP用量的增大,硅橡胶的热释放速率峰值和烟气释放速率减小,邵尔A型硬度、拉伸强度和撕裂强度增大,拉断伸长率呈减小趋势。与未添加阻燃剂MPP的硅橡胶相比,阻燃剂MPP填充硅橡胶的初始分解温度下降。 相似文献
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Summary Poly(1-methyl-1-phenyl-1-silapentane) (I) has been prepared by the chemical reduction of the carbon-carbon double bonds of poly(1-methyl-1-phenyl-1-sila-cis-pent-3-ene (cis-II) with diimide, which was generatedin-situ by the thermal decomposition ofp-toluenesulfonhydrazide in refluxing toluene. At lower temperature (100°C),cis-II is isomerized byp-toluenesulfinic acid to lower molecular weight poly(1-methyl-1-phenyl-1-sila-cis andtrans-pent-3-ene) (cis/trans-II). Protodesilation of I with trifluoromethanesulfonic acid yields poly(1-methyl-1-trifluoromethanesulfonyl-1-silapentane) (III). The structures of I andcis/trans-II have been characterized by1H,13C and29Si NMR, GPC, TGA and elemental analysis. The structure of I has been characterized spectroscopically by1H,13C,19F and29Si NMR. 相似文献
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The influence of anion adsorption on friction forces in an electrochemical environment has been studied by means of lateral force microscopy on Au(1 1 1) surfaces. Sensitivity to atomic stick-slip motion allows to reveal sulphate adsorption in ordered layers under the sliding tip at potentials lower than expected from cyclic voltammetry for the open surface. No ordered adsorption is found in lateral force measurements for the weakly adsorbed perchlorate anions. Correspondingly, some increase in friction in the anion adsorption regime is observed for sulphate but none for perchlorate adsorption. Friction increases significantly at the onset of oxidation in both sulphuric and perchloric acid solutions. 相似文献