不同应变下CB/ENR 复合材料中CB的聚集状态及结演化

打开文本图片集

中图分类号：TB34；TQ332 文献标志码：A 文章编号：1671-8755（2025）03-0035-08

Abstract：Functional elastomer composites have been widely applied in the fields such as flexible electronics andsmart materials due to their excellnt flexibility and functionality.The critical factors influencing their application include filer size，dispersion state，and structural evolution under external fields. CB/ENR composites with different conductive carbon black （CB） contents were constructed using CB as afillr.The aggregation state of CB in the CB/ENR composite system under different CB filler contents and the structural evolution mechanism under tensile conditions were studied using synchrotron radiation small angle X -ray scatering （SAXS）. The results demonstrate when the massfraction of conductive filler CB is 20% ，the composite achieves optimal mechanical properties （ ⋅5.57MPa ）and minimal resistance variation rate. Compared to samples with mass fractions of 10% and 30% ，CB/ENR composite with 20% mass fraction of CB exhibits the highest SAXS intensity，indicating the most compact and uniform CB dispersion，along with the maximum fractal dimension of 2.74，which reflects the roughest CB aggregate surfaces.Under identical strain conditions，the fractal dimension of CB in the CB/ENR composite system with a mass fraction of 20% consistently exceeds that of comparative samples. This suggests that the surface-roughened and uniformly dispersed CB fillers can enhance interfacial bonding with the matrix and effectively dissipate external stress，thereby synergistically improving the comprehensive performance of the composite system.

Keywords：Functional elastomer； Carbon black；Epoxy-modified natural rubber；Filler distribution; Structural evolution

随着科学的不断进步，对高性能材料的需求不断增长。（剩余10961字）