Effect of heat treatment on the mechanical properties of casein-g-polyacrylonitrile fibers

摘要

Four kinds of casein-g-polyacrylonitrile fibers with different casein contents were prepared, and mechanical properties were investigated after different heat treatment. The results showed that the grafted casein fibers were sensitive to temperature. With the increase of casein content, the effect of more continuous phases in fiber increased after high temperature treatment. The strength and elongation at break both tended to increase. However, the colors of the fibers gradually changed to yellow under the higher temperature, due to the thermal oxidative decomposition of casein. SEM observations on the cross section surface of modified fibers showed the different structures in grafted casein fibers with different casein contents.