Crosslinking of ethylene-octene copolymers under dynamic conditions: a new way to access polymeric hyperbranched structure.: An article from: Polymer Engineering and Science
Book Details
Author(s)A. Msakni, P. Chaumont, P. Cassagnau
PublisherThomson Gale
ISBN / ASINB000LC48FA
ISBN-13978B000LC48F2
MarketplaceFrance 🇫🇷
Description
This digital document is an article from Polymer Engineering and Science, published by Thomson Gale on November 1, 2006. The length of the article is 6563 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: The crosslinking process of ethylene-octene copolymers by dicumyl peroxide (DCP) has been studied under static and dynamic conditions. Under static conditions, our results (gel time, insoluble fraction, and equilibrium modulus) qualitatively agree with the theories on the prediction of properties of random crosslink network. Furthermore, it can be concluded that the chain linking reaction is dominant and that the beta chain scission can be neglected for these copolymers. We report an original and new result: under dynamic conditions, inside the chamber of a batch mixer, the dynamically crosslinked samples are reprocessable, meaning that the final microstructure is totally different from that obtained under static conditions. Indeed, the samples crosslinked under shearing and mixing are soluble and the size exclusion chromatography analysis revealed a broad molecular weight distribution with a significant tail of high molecular weights situated around [10.sup.6] g/mol. This molten media can be imagined as a continuum of clusters of different multiscale sizes from the size of a free precursor chain to larger clusters of high molecular weights. Actually, the balance between reaction and mixing efficiency is the controlling parameter for the development of this hyperbranched structure under dynamic conditions. POLYM. ENG. SCI., 46:1530-1540, 2006. [C] 2006 Society of Plastics Engineers
Citation Details
Title: Crosslinking of ethylene-octene copolymers under dynamic conditions: a new way to access polymeric hyperbranched structure.
Author: A. Msakni
Publication:Polymer Engineering and Science (Magazine/Journal)
Date: November 1, 2006
Publisher: Thomson Gale
Volume: 46 Issue: 11 Page: 1530(11)
Distributed by Thomson Gale
From the author: The crosslinking process of ethylene-octene copolymers by dicumyl peroxide (DCP) has been studied under static and dynamic conditions. Under static conditions, our results (gel time, insoluble fraction, and equilibrium modulus) qualitatively agree with the theories on the prediction of properties of random crosslink network. Furthermore, it can be concluded that the chain linking reaction is dominant and that the beta chain scission can be neglected for these copolymers. We report an original and new result: under dynamic conditions, inside the chamber of a batch mixer, the dynamically crosslinked samples are reprocessable, meaning that the final microstructure is totally different from that obtained under static conditions. Indeed, the samples crosslinked under shearing and mixing are soluble and the size exclusion chromatography analysis revealed a broad molecular weight distribution with a significant tail of high molecular weights situated around [10.sup.6] g/mol. This molten media can be imagined as a continuum of clusters of different multiscale sizes from the size of a free precursor chain to larger clusters of high molecular weights. Actually, the balance between reaction and mixing efficiency is the controlling parameter for the development of this hyperbranched structure under dynamic conditions. POLYM. ENG. SCI., 46:1530-1540, 2006. [C] 2006 Society of Plastics Engineers
Citation Details
Title: Crosslinking of ethylene-octene copolymers under dynamic conditions: a new way to access polymeric hyperbranched structure.
Author: A. Msakni
Publication:Polymer Engineering and Science (Magazine/Journal)
Date: November 1, 2006
Publisher: Thomson Gale
Volume: 46 Issue: 11 Page: 1530(11)
Distributed by Thomson Gale
