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Production and properties of highly oriented polypropylene by die drawing

✍ Scribed by A. K. Taraiya; A. Richardson; I. M. Ward

Publisher
John Wiley and Sons
Year
1987
Tongue
English
Weight
866 KB
Volume
33
Category
Article
ISSN
0021-8995

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✦ Synopsis

A c o m p r e h e v e examination of the diedrawing 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, of 23.2.

Using a large-scale machine, it was found poseible to produce drawn products at speeds up to 2 m h -1 at a draw temperature of 155OC and RA of 19.3. The dynamic mechanical behavior of several drawn materials was studied over the temperature range -80 to +80°C. It was of particular interest that the / 3 relaxation was found to be absent in samples of high draw ratio.

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