Roller drawing of ultrahigh molecular weight polyethylene

✍ Scribed by Akira Kaito; Kazuo Nakayama; Hisaaki Kanetsuna

• Publisher: John Wiley and Sons
• Year: 1985
• Tongue: English
• Weight: 922 KB
• Volume: 30
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1985.070301207

✦ Synopsis

The roller drawing of ultrahigh molecular weight polyethylene (UHMW-PE) sheets were carried out in the roller temperature T, range of 100-140°C. In addition to the roller drawing in the solid state (T, = lOOT), we attempted to crystallize the molten UHMW-PE sheet under the rollerdrawing process (T, = 100-14o"c). The tensile and dynamic viscoelastic properties, the molecular orientation, and the microstructure of the rollerdrawn UHMW-PE sheets were investigated. The mechanical properties of UHMW-PE sheets were much improved by crystallization during the roller drawing process at T, = 140°C. The sheets rollerdrawn at T, = 135 and 140°C exhibited caxis orientation to the draw direction and (100) alignment in the sheet plane. However, at T, = 100°C the elastic motion of the amorphous chains induces the twmmngs of lattice, which enhances the transition to the (110) alignment in the sheet plane. The dynamic storage modulus below ydispersion temperature showed good correlation with crystallinity and orientation functions, while taut tie molecules and thick crystallitea play an important role in the storage modulus above ydipersion temperature.

. .