Influence of two-stage drawing conditions on the ultradrawing behavior of gel films of ultrahigh molecular weight polyethylene and low molecular weight polyethylene blends

摘要

The influence of the two-stage drawing conditions on the ultradrawing behavior of the gel films of ultrahigh molecular weight polyethylene/low molecular weight polyethylene blends is reported. The critical draw ratios (#lambda#_c) of the gel films prepared near their critical concentrations were found to depend significantly on their draw ratio attained in the first drawing stage (D__(lr) and on the temperature utilized in the second drawing stage (T_(sec)). After drawing the gel films up to a fixed draw ratio in the first drawing stage, each two-stage drawn gel film exhibited a maximum #lambda#_c (#lambda#_(cmax)) by drawing the drawn gel film at its corresponding optimum T_(sec).