Effect of Cyanoethylation Modified Secondary Fiber on Fibre-Reinforced Composites

Cyanoethylated secondary fiber (CSF) were made from secondary fiber(SF) cyanoethylation, and the effect of cyanoethylation on SF and CSF/RHDPE composites were investigated. The reinforcing mechanism of CSF in composites was discussed. Compared with unmodifed fiber, modifed fiber improved interfacial compatibility between CSF and RHDPE, and resulted in enhancing the mechanical properties of CSF/RHDPE composites. Furthermore, The fibre mass fraction and nitrogen content of CSF affected the mechanical properties of CSF/RHDPE composites, When nitrogen content of CSF was 20.36% and content of CSF was 20wt%, composites show maximum mechanical properties. The influence degree of CSF addition on CSF/RHDPE composites´ processability was smaller than SF/RHDPE composites. CSF weakened melting and crystallization properties of the RHDPE in the composites. The mechanical properties of CSF/RHDPE composites were better than those of SF/RHDPE. SEM observations on the fracture surface of the composites show that the fibre-matrix adhesion was improved after cyanoethylation treatments.