溶液処理した超高分子量ポリエチレンの伸長流動
Elongational Flow of Solution Treated Ultra-high Molecular Weight Polyethylene
小山清人・井上良徳・田中克史
Koyama, Kiyohito / Inoue, Yoshinori / Tanaka, Katsufumi
The experimental study of elongational flow for solution treated ultra-high molecular weight polyethylene (polyethylene gel) was carried out using an elongational rheometer. Three different molecular weight polyethylenes, Mw=1.0xl0n, 2.0xl06 , 2.5xl06 were used. Solutions were prepared by dissolving 10 wt% of the polyethylenes in decalin. The solution treated ultra-high molecular weight polyethylenes were uniformly elongated in constant strain rate elongation experiments. The elongational viscosity-time relation at 140℃ shows the same behavior as polymer melts except at high viscosity. The elongational strain (draw ratio) at high temperature are much smaller than that in lower temperature experiments. A rapid increase in elongational viscosity appears at ca. 200 sec for strain rate of 0.008 sec-1. The degree of the viscosity increase of the solution treatad polyethylene is much steeper than that of polymer melts. The steep increase in the viscosity was discussed in terms of the structure development of the solution treated polyethylene.
Key words: Polymer Gel / Ultra high molecular weight / Ultra high strength / Polyethylene / Elongational flow