Premium
Preparation of high modulus polyethylene sheet by the roller‐drawing method
Author(s) -
Kaito Akira,
Nakayama Kazuo,
Kanetsuna Hisaaki
Publication year - 1985
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1985.070300328
Subject(s) - high density polyethylene , materials science , composite material , microstructure , modulus , amorphous solid , polyethylene , small angle x ray scattering , diffraction , scattering , crystallography , optics , physics , chemistry
The high density polyethylene (HDPE) sheets were drawn through a pair of heated rollers. The process, referred to as roller drawing, was found to be useful for producing high modulus and high strength HDPE sheets. The higher draw ratio could be obtained for the HDPE sheet with lower molecular weight and narrower molecular weight distribution. The Young's modulus and the breaking strength reached 43 GPa and 0.67 GPa, respectively, at the highest draw ratio. The measurements of wide‐angle X‐ray diffraction (WAXD) pole figures revealed that the crystallographic a ‐, b ‐, and c ‐axes were oriented to the normal direction (ND), the traverse direction (TD), and the drawing direction (DD), respectively. The small‐angle X‐ray scattering (SAXS) of the roller‐drawn HDPE sheets with draw ratio higher than 7 exhibited two intensity maxima on the meridian, suggesting the presence of the two‐phase structure in which crystalline and amorphous regions are stacked alternately along DD. The relationship between mechanical properties and microstructure was discussed on the basis of the concept of the formation of amorphous tie molecules in the interfibrillar and intercrystallite regions.