上海大学学报(英文版)
上海大學學報(英文版)
상해대학학보(영문판)
JOURNAL OF SHANGHAL UNIVERSITY
2004年
1期
101-108
,共8页
戚嵘嵘%朱清仁%周持兴%刘萌戈%周贵恩
慼嶸嶸%硃清仁%週持興%劉萌戈%週貴恩
척영영%주청인%주지흥%류맹과%주귀은
ultrahigh-molecular weight polyethylenes (UHMWPE)%gel film%hot-drawing%morphological changes
The three stages in the hot-dawing process of ultrahigh-molecular-weight polyethylene gel films can be detected by x-ray diffraction, infrared spectroscopy, birefringenece and scanning electron microscopy. In the first stage of the drawing process, the lamellae in the gel films rotate and/or slip with the b-axis preferentially perpendicular to the drawing direction. With increased drawing , the c-axis of the lamellae become parallel to the stretching direction while unfolding of the chain begins, and the chains of the amorphous phases also orient along the drawing direction in the strain-chain domain. When the draw ratio is large enough, the lamellar structure is transformed into a fibrillar structure in a two-dimensional fashion.
