초록
The graft copolymerization of ε-caprolactam onto Kevlar 49 fiber surface was carried out by the anionic chain addition of s-caprolactam to the N-metalated Kevlar. Studies have been made on the effects of reaction conditions on the wafiing percentage(GP) and on the tensile strength of the fiber. GP significantly increased with increasing metalation time, NaH concentration, polymerization temperature and time. The tensile strength of fiber decreased with increasing metalation time, NaH concentration, polymerization temperature and time. In order to retain over 90% of tensile strength of the original Kevlar 49 fiber and to increase over 20% of GP, the optimum reaction conditions are as follows: NaH concentration; ion; 4.2mmol/l/0.5g Kevlar, metalation time; 30min, monomer concentration; 5.04mol/l/0.5g Kevlar, polymerization temperature; 70℃, polymerization time; 10sec. The Young's modulus of N-metalated Kevlar 6ber showed lower values than that of the original Kevlar fiber. However, the Young's modulus increased with increasing GP.