云母粉在丁苯橡胶中的分散性和界面特征

Dispersion and Interface Characteristics of Mica Powder in SBR

研究粒级分别为0~5,5~10,10~20μm的3种改性云母粉在丁苯橡胶(SBR)中的分散性和界面特征。结果表明:云母粉对SBR的补强性能与云母粉的粒级和径厚比有关,5~10μm云母粉粒级较小,径厚比较大,补强效果较好;0~5μm云母粉在SBR中分布较均匀,以垂直于断面的方向定向排列,断面上存在孔洞;5~10μm云母粉在SBR中一部分以垂直于断面的方向排列,另一部分以平行于断面的方向定向排列,平行排列的云母粉粒径较小,片状云母粉层与层之间被小粒径云母粉填充,可实现紧密堆积并吸收部分应力,提高云母粉对SBR的补强效果;10~20μm云母粉在SBR中只有小部分以垂直于断面方向排列,补强效果较差。

The dispersion and interface characteristics of three kinds of modified mica powders with particle size of 0- 5,5 - 10 and 10-20 μm in styrene-butadiene rubber （SBR） were studied. The results showed that the reinforcing properties of mica for SBR composites were related to the particle size and diameter to thickness ratio of mica powder. The mica powder with size of 5 - 10 μm was small and the ratio of diameter to thickness was large,and the reinforcing effect was good. The dispersion of 0-5 -tm mica in the rubber was uniform and aligned to the direction perpendicular to the fracture surface, and there were pores in the fracture surface. 5- 10 -tm mica was partially aligned in the vertical direction of fracture surface, some small particles was aligned in the parallel direction, and smaller mica powder was filled between the layered mica particles which formed tightly stacked structure of filler and provided better stress absorption and better reinforcement to rubber. 10-20 -m mica only had a small part aligned in the direction perpendicular to the fracture surface and its reinforcing effect was poor.