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Production and properties of highly oriented polypropylene by die drawing
Author(s) -
Taraiya A. K.,
Richardson A.,
Ward I. M.
Publication year - 1987
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.1987.070330723
Subject(s) - polypropylene , die (integrated circuit) , materials science , modulus , composite material , atmospheric temperature range , relaxation (psychology) , dynamic mechanical analysis , young's modulus , dynamic modulus , thermodynamics , polymer , nanotechnology , physics , psychology , social psychology
A comprehensive examination of the die‐drawing behavior of polypropylene has been carried out, examining the effects of draw temperature, haul‐off speed, and initial billet size. A range of oriented products was obtained and characterized, primarily by the determination of Young's modulus at room temperature, the maximum modulus being 20 GPa for a draw ratio R A of 23.2. Using a large‐scale machine, it was found possible to produce drawn products at speeds up to 2 m min −1 at a draw temperature of 155°C and R A of 19.3. The dynamic mechanical behavior of several drawn materials was studied over the temperature range −30 to +80°C. It was of particular interest that the β relaxation was found to be absent in samples of high draw ratio.