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采用原位固相接枝方法,使在高温和强剪切作用下降解的天然橡胶接枝到炭黑表面.采用透射电镜(TEM)、原子力显微镜(AFM)等方法观察了接枝前后的炭黑粒子形貌变化,发现未接枝炭黑以微米级的附聚体形式存在,而由于炭黑聚集体被强剪切力部分破坏,接枝炭黑的聚集程度明显减弱,粒子的尺寸减小.采用激光光散射粒度仪对接枝前后炭黑的粒度进行分析,接枝炭黑的体积平均粒径为164 nm,远小于测得的原炭黑的粒径797 nm.采用沉降法、透光率法及zeta电位测量研究了接枝改性对炭黑在溶剂中的分散性及分散稳定性的影响,结果表明,接枝炭黑在接枝分子的溶剂中的分散性变好,分散稳定性提高.
The in-situ solid-phase grafting method was used to graft the natural rubber degraded under high temperature and strong shear onto the carbon black surface.The carbon before and after grafting was observed by transmission electron microscopy (TEM) and atomic force microscopy (AFM) The morphology of black particles was changed. It was found that the non-grafted carbon black existed in the form of micrometer-scale agglomerates. However, due to the partial destruction of the carbon black aggregates by the strong shear force, the aggregation degree of the grafted carbon black obviously decreased and the size of the particles decreased The particle size of carbon black before and after grafting was analyzed by laser light scattering particle sizer.The volume average diameter of grafted carbon black was 164 nm which was much smaller than the measured particle size of original carbon black 797 nm.Using the sedimentation method, Transmittance and zeta potential measurements of grafted modified carbon black in the solvent dispersion and dispersion stability of the results showed that the grafted carbon black in the solvent dispersion of the graft molecules become better, Improved dispersion stability.