Crosslinking of Synthetic Fibers by Peroxide (Part1). Crosslinking of Nylon 66 Fiber by Dicumyl Peroxide and Benzoyl Peroxide.

Abstract

Commercial nylon 66 fibers were dipped in a chloroform solution of dicumyl peroxide (DCP) or benzoyl peroxide (BPO) at 60_??_65°C under N2 atmosphere for predetermined times and then crosslinked at 150°C for 2h. The crosslinked fibers became partially insoluble in hot formic acid after dipping for 5 days for DCP and 3 days for BPO. By this crosslinking treatment the crystalline region was also affected. Reduced specific viscosity of crosslinked fibers decreased with the increase in crosslinking temperature and time of dipping, showing that the crosslinking of molecular chains occurred abreast with decomposition of main chains. Density and Young's modulus of crosslinked fibers increased, but tenacity and elongation decreased with the increase in time of dipping. The degrees of these increases and decreases were more remarkable for BPO than DCP.