超高分子量ポリエチレン―高結晶性ポリプロピレンブレンドフィノレムの同時二軸延伸による結晶配向と力学的性質第1報 ゲルプレスおよびプレスフィルムの同時二軸延伸による結晶各回折面の配向挙動と力学的性質
Crystalline Orientation and Mechanical Properties with Biaxially Stretching of Ultrahigh Molecular Weight Polyethylene and Low Molecular Weight Polypropylene Blend Gel FilmsI. Orientation Behaviors of Each Diffractive Plane and Mechanical Properties for Simultaneous Biaxial Stretching of Gel Press and Press Films
大元義夫・丹羽貴裕・橋詰慈洋・日比貞雄
Oomoto, Yoshio / Niwa, Takahiro / Hashizume, Shigehiro / Hibi, Sadao
Homo polyethylene and polyethylene-polypropylene blends were produced by gelation/ crystallization from semidilute solutions using ultrahigh molecular weight polyethylene (UHMWPE) (2.0xl06) and low molecular weight high crystallinity polypropylene (it-PP) (4xl05). Homo it-PP film was produced by compression molding. Blend composition chosen were 75/25, 50/50, and 25/75. Homo PE and blend films were pressed using a molding machine in order to gain uniform thickness gelation films. Biaxial films, typically 2x2 and 3x3 times (for it-PP, 3x3 and 5x5 times) the original dimensions, were prepared at 130〜160℃ in a biaxial stretcher. WAXD photographs show that lamellar structure transforms to fibrillar texture during biaxial stretching. The preferential orientations of the crystals were characterized by WAXD photographs. Mechanical studies suggest that tensile modulus and strength appear uniform. In comparison with undeformed film, significant improvement in the film plane was seen in the biaxially stretched film.
Key words: UHMWPE / it-PP / Gelation / Blend / Biaxial stretching / WAXD / Mechanical property