Ultradrawing properties of gel films of ultrahigh-molecular-weight polyethylene and low-molecular-weight polyethylene blends prepared at various formation temperatures

摘要

The ultradrawing behavior of ultrahigh-molecular-weight polyethylene/low-molecular-weight polyethylene film specimens prepared at various concentrations and formation temperatures was studied. The critical draw ratio (D-rc) of UL-0.7 film specimens was found to depend significantly on the formation temperature used to prepare the film specimens. At any fixed drawing temperature, the D-rc values of UL-0.7 specimens prepared at various formation temperatures increased significantly as the formation temperatures were reduced. In fact, with an optimum drawing temperature of 95degreesC, the D-rc values of UL-0.7 specimens prepared at a formation temperature of 0degreesC reached 488, about 50% higher than that of UL-0.7 specimens prepared at a formation temperature of 95degreesC. These interesting phenomena were investigated in terms of the thermal, birefringence, and tensile properties of these undrawn and drawn UL-0.7 specimens. (C) 2003 Wiley Periodicals, Inc. [References: 46]