Ram extrusion of high-density polyethylene and polypropylene in solid state: process conditions and properties.(First Symposium on Oriented Polymers ): An article from: Polymer Engineering and Science
Book Details
Author(s)N. Legros, A. Ajji, M.M. Dumoulin
PublisherSociety of Plastics Engineers, Inc.
ISBN / ASINB00097VEY0
ISBN-13978B00097VEY8
AvailabilityAvailable for download now
Sales Rank9,955,763
MarketplaceUnited States 🇺🇸
Description
This digital document is an article from Polymer Engineering and Science, published by Society of Plastics Engineers, Inc. on November 1, 1997. The length of the article is 3887 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser.
From the author: Highly oriented high-density polyethylene (HDPE) and polypropylene (PP) were obtained by solid state extrusion near, but below, the melting temperature. Draw ratios of 6 and 11 were obtained using properly designed dies, preformed billets and lubrication for different extrusion temperatures. Orientation induced significant changes in properties and morphology that are related to the final draw ratio. The draw ratio was observed to decrease with an increase in extrusion speed due to the molecular relaxation occurring because of local heating during deformation. An increase in the degree of crystallinity was observed for the oriented polymers as well as a large improvement in the tensile modulus. Significant molecular relaxation and elastic recoil were observed during processing. Extrusion speed strongly increases the extent of relaxation, and, consequently, reduces many of the mechanical properties.
Citation Details
Title: Ram extrusion of high-density polyethylene and polypropylene in solid state: process conditions and properties.(First Symposium on Oriented Polymers )
Author: N. Legros
Publication:Polymer Engineering and Science (Refereed)
Date: November 1, 1997
Publisher: Society of Plastics Engineers, Inc.
Volume: 37 Issue: 11 Page: 1845(8)
Distributed by Thomson Gale
From the author: Highly oriented high-density polyethylene (HDPE) and polypropylene (PP) were obtained by solid state extrusion near, but below, the melting temperature. Draw ratios of 6 and 11 were obtained using properly designed dies, preformed billets and lubrication for different extrusion temperatures. Orientation induced significant changes in properties and morphology that are related to the final draw ratio. The draw ratio was observed to decrease with an increase in extrusion speed due to the molecular relaxation occurring because of local heating during deformation. An increase in the degree of crystallinity was observed for the oriented polymers as well as a large improvement in the tensile modulus. Significant molecular relaxation and elastic recoil were observed during processing. Extrusion speed strongly increases the extent of relaxation, and, consequently, reduces many of the mechanical properties.
Citation Details
Title: Ram extrusion of high-density polyethylene and polypropylene in solid state: process conditions and properties.(First Symposium on Oriented Polymers )
Author: N. Legros
Publication:Polymer Engineering and Science (Refereed)
Date: November 1, 1997
Publisher: Society of Plastics Engineers, Inc.
Volume: 37 Issue: 11 Page: 1845(8)
Distributed by Thomson Gale
