Submitted to: Proceedings of American Chemical Society National Meeting
Publication Type: Proceedings
Publication Acceptance Date: 3/26/2006
Publication Date: 3/26/2006
Citation: Jong, L. 2006. Effect of preparation methods on the viscoelastic properties of polymer composites reinforced by soy spent flakes. Proceedings of American Chemical Society National Meeting. 47(1):125-126.
Technical Abstract: In rubber reinforcement, the filler network structure has a significant effect on rubber modulus. Different preparation methods may produce different filler network structures, and lead to different reinforcement effects. In this study, more insight on the reinforcement mechanism is obtained by comparing different preparation methods - casting versus freeze-drying. Soy spent flakes (SSF) used in this study are mostly a soy carbohydrate fraction in soybean. Carbon black (CB) is also included as a comparison. SSF and CB are used as fillers to make reinforced rubber composites. Comparison between the freeze-drying and casting methods indicate that the filler network related structure in the composites prepared by freeze-drying is more elastic than that of the casting method, and can be explained by the model of polymer mediated filler network. The shifting of G” maximum in SSF and CB composites with an increasing filler concentration indicates CB has a greater filler-rubber interaction. The stress softening effect of SSF and CB composites, again, indicates the composites prepared by the freeze-drying method have a better recovery behavior than that of the casting method due to their more elastic filler network structure. This study shows that the composites prepared by the freeze-drying method have a more elastic filler network structure, which can be explained by the increasing presence of a thin polymer layer between filler aggregates