Crsslinking effect of ultrahigh molecular weight polyethylene-low molecular weight polyethylene blend films produced by gelation/crystallization from solutions |
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| Authors: | C. Sawatari F. Ozaki M. Kimura T. Ogita M. Matsuo |
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| Affiliation: | (1) Faculty of Education, Shizuoka University, Shizuoka, Japan;(2) Department of Polymer Materials Engineering, Faculty of Engineering, Yamagata University, Yonezawa, Japan;(3) Present address: Department of Clothing Science, Faculty of Home Economics, Nara Women's University, 630 Nara, Japan |
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| Abstract: | Polyethylene-polyethylene blend films were prepared by gelation/crystallization from semidilute solution by using ultrahigh molecular-weight (mw) polyethylene (UHMWPE) (mw=6×106) and low molecular weight polyethylene (LMWPE) (mw=4×104). The UHMWPE/LMWPE compositions chosen were 50/50, 67/33, and 91/9. Elongation was carried out in a hot oven at 115–130°C. The drawn films were exposed to an electron beam under nitrogen flow. Radiation doses chosen were 10, 20, 40, and 100 Mrad. crosslinking caused a significant effect in improving high temperature resistance for the blend film with draw ratio of 20 in the case of irradiation doses less than 20 Mrad. The elongation beyond 20 times and high doses beyond 20 Mrad hampered the crosslinking effect and the specimens were easily torn manually. This is thought to be due to the fact that the excess irradiation dose causes main chain scission apart from crosslinking. |
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| Keywords: | Polyethylene-polyethylene blend films electron beam radiation doses cross-linking high temperature resistance |
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