羰基铁粉填充天然橡胶基磁流变弹性体的性能

发布时间：2018-10-21 12:29

【摘要】：以天然橡胶(NR)为基体,考察了4种牌号(EW、SM、SQ、CN)的羰基铁粉对NR混炼胶的硫化特性及NR基磁流变弹性体(MRE)在压缩状态下的磁流变性能、物理机械性能、热稳定性及微观形态的影响。结果表明,EW、SM、SQ、CN的平均粒径依次增大,且CN具有最宽的粒径分布,EW具有最窄的粒径分布;在4种牌号的羰基铁粉中,SM填充NR混炼胶的焦烧时间和正硫化时间最短,硫化速率最快;随着羰基铁粉粒径的增加,NR混炼胶的交联密度增大,在硫化过程中均出现的硫化返原程度加剧;SM填充MRE的磁流变效应最高,CN填充MRE的磁流变效应最低;随着羰基铁粉粒径的增加,MRE的邵尔A硬度无明显变化,300%定伸应力呈上升趋势,拉伸强度和扯断伸长率都有所降低,其中CN填充MRE的耐热稳定性最好;在4种牌号的羰基铁粉填充MRE中,CN和SQ的整体粒径较大,且CN有较明显的块状团聚,而SM和EW的整体粒径较小。
[Abstract]:The vulcanization properties of four carbonyl iron powders (EW,SM,SQ,CN) on NR blends and the effects of NR based MRE (MRE) on the mechanical properties, physical and mechanical properties, thermal stability and micromorphology of NR blends under compression state were investigated using natural rubber (NR) as the matrix. The results showed that the average particle size of EW,SM,SQ,CN increased in turn, and CN had the widest particle size distribution and EW had the narrowest particle size distribution. Among the four grades of carbonyl iron powder, the scorch time and positive vulcanization time of SM filled NR blend were the shortest, and the vulcanization rate was the fastest. With the increase of the particle size of carbonyl iron powder, the crosslinking density of NR blends increased, and the degree of vulcanization return increased during the vulcanization process, the magneto-rheological effect of MRE filled with SM was the highest, and that of MRE filled with CN was the lowest. With the increase of the particle size of carbonyl iron powder, the Shore A hardness of MRE showed no obvious change, and the tensile strength and elongation at break decreased, and the tensile strength and elongation at break decreased, and the thermal stability of MRE filled with CN was the best. In the four kinds of carbonyl iron powder filled with MRE, the overall particle size of CN and SQ is larger, and CN has obvious agglomeration, while that of SM and EW is smaller.
【作者单位】：南京理工大学软化学和功能材料教育部重点实验室;南京理工大学发射动力学研究所;
【基金】：南京理工大学国家级大学生科研训练项目
【分类号】：TB332;TQ330.1

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