白炭黑在天然橡胶/丁苯橡胶并用胶中偏析现象的定量表征

Quantitative Characterization of Silica Segregation Behavior in Natural Rubber/Styrene Butadiene Rubber Blends

借助介电松弛谱、红外光谱、动态力学热分析方法探讨白炭黑在天然橡胶(NR)/丁苯橡胶(SBR)并用胶中的偏析行为,并对其进行定量表征。研究结果表明,白炭黑均向NR相偏移,且不依赖于胶料的并用比。分析认为,这种偏析行为不仅与填料-橡胶相互作用相关,还与白炭黑聚集体在各橡胶相中形成具有不同尺度的填料网络结构相关;对其硫化胶进行研究发现,白炭黑仍向NR相偏移,且硫化前后偏移程度不同,说明硫化过程对白炭黑在并用橡胶相间的偏析行为有显著的影响。

The segregation behavior of silica in natural rubber (NR)/ styrene butadiene rubber (SBR) blends was investigated by dielectric relaxation spectrum, Fourier transform infrared spectrum and dynamic mechanical analysis. And it was detected quantitatively. The results show that the silica is easy to locate at NR phase. It is independent on the ratio between NR and SBR. The segregation behavior is not only related to filler-polymer interaction, but also relates to silica network structure with different sizes, which are formed in different rubber phases. The results for silica filled NR/SBR vulcanizates with different ratios between NR and SBR show that the silica is still easy to locate at NR phase. The quantitative results between compounds and vulcanizates are different, which indicate that the vulcanization process has a significant effect on the filler segregation behavior.