Abstract
Irradiation cross-linking of polyamide 6 (PA6) fibers in the presence of polyfunctional monomer was studied. The combination of trimethallyl isocyanurate (TMAIC) and trimethylolpropane trimethacrylate (TMPTMA) was found to enhance the irradiation cross-linking of PA6 fibers efficiently. The effect of dose rate on the irradiation cross-linking was also investigated. The highest gel content was achieved when the fibers were irradiated at a high dose rate of 10 kGy/h. In this case, the breaking strength changed slightly and the elongation at break decreased. At a low dose rate of 1 kGy/h, the breaking strength fell drastically and the elongation at break increased at first and then decreased. The onset temperature of degradation fell and the amount of non-volatile residue at 600℃ increased as the irradiation dosage and dose rate increased. A high gel fraction largely improved the melt-drip performance of PA6 fibers. Irradiation cross-linking did not change the α-phase crystal form of PA6 fibers, and crystallinity decreased as the dose increased.
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