Abstract

This study focused on the preparation method and evaluation of micro-nano composites based on emulsion polymerization styrene butadiene rubber (ESBR) and kaolinite. A novel method – latex blending was utilized to improve the dispersion of kaolinite in matrix and obtain a semi-exfoliation type clay/polymer composite. The results showed that the kaolinite particles presented a semi-exfoliation state and micro-nano scale dispersion in ESBR matrix. The micromorphology of layer-like particles in rubber matrix presented loose and blurry attributed to the interaction between kaolinite plate-like particles and rubber molecules in the latex mixing process, and thus resulted in the reduction of kaolinite crystal order degree. The maximum torque (M_H), minimum torque (M_L), and ΔM presented a gradually increase tendency with the increase of filler content and the reduction of kaolinite particle size. The mechanical properties of kaolinite/ESBR displayed a significant improvement, and the relative mechanical parameters increased as increasing filler content or reducing kaolinite particle size. The tensile strength and tear strength of the kaolinite/SBR composite reached at 15.1 MPa and 51.3 kN/m, respectively when the filler content at 80 phr. The thermal stability of kaolinite/ESBR composites presented a considerably improvement as decreasing kaolinite particle size or at a reasonable range of filler content. The characteristic decomposition parameters of kaolinite/SBR composite increased compared with those of pure ESBR. The above data indicating that the ESBR chains interacted with kaolinite particles by chemical interaction and the polymer molecules may be intercalated the surface group and interlayer of kaolinite, and thus resulted in the transformation of layer-like microstructure and the restriction on motion of rubber chains in the composite system.

中文翻译：

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胶乳共混法制备高岭石/乳液聚合苯乙烯丁二烯橡胶复合材料的力学性能和热稳定性

摘要

本研究的重点是基于乳液聚合的丁苯橡胶（ESBR）和高岭石的微纳米复合材料的制备方法和评价。一种新的方法-乳胶共混用于改善高岭石在基质中的分散性，并获得半剥离型粘土/聚合物复合材料。结果表明，高岭石颗粒在ESBR基体中呈现半剥落状态和微纳米级分散。橡胶基质中层状颗粒的微观形貌呈现松散和模糊，这归因于高岭石板状颗粒与橡胶分子在胶乳混合过程中的相互作用，从而导致高岭石晶体有序度的降低。最大扭矩（M _H），最小扭矩（M _L）和ΔM随着填料含量的增加和高岭石粒径的减小，合金呈现出逐渐增加的趋势。高岭石/ ESBR的机械性能显示出显着的改善，并且相对机械参数随着填料含量的增加或高岭石粒度的减小而增加。当填料含量为80 phr时，高岭石/ SBR复合材料的拉伸强度和撕裂强度分别达到15.1 MPa和51.3 kN / m。高岭石/ ESBR复合材料的热稳定性随着降低高岭石粒度或在合理的填料含量范围内呈现出显着的改善。与纯ESBR相比，高岭石/ SBR复合材料的特征分解参数增加。