Book Description
This digital document is an article from Polymer Engineering and Science, published by Society of Plastics Engineers, Inc. on August 1, 2003. The length of the article is 7567 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: Recent studies have demonstrated that highly multilayered blend morphologies can be formed by chaotic mixing and captured within extrusions of various forms. The number and thickness of internal layers prior to layer breakup and the extent of breakup are controllable via specification of process variables. A variety of derivative morphologies can thereby be obtained. Although methods can be applicable to other blends, the relation of oxygen permeability to various morphologies was specifically investigated in this study for extruded films without drawing consisting of ethylene vinyl alcohol copolymer, low density polyethylene and maleic anhydride modified polyethylene as a compatibilizing agent. Optimal barrier properties were obtained in a novel single phase continuous and mechanically interlocked morphology that was an outcome of stretching and folding characterizing chaotic mixing. Barrier properties were similar to those obtainable in co-extruded films because of the presence of abundant platelets across the film thickness and crystallinity increases caused by barrier phase refinement.Citation Details
Title: Production of barrier films by chaotic mixing of plastics.
Author: O Kwon
Publication: Polymer Engineering and Science (Refereed)
Date: August 1, 2003
Publisher: Society of Plastics Engineers, Inc.
Volume: 43 Issue: 8 Page: 1443(17)Distributed by Thompson Gale
Excerpt. © Reprinted by permission. All rights reserved.
INTRODUCTION In recent years, chaotic mixing has been employed as a tool for controllably generating a variety of fine-scale internal structures among two or more polymers and additives (1-3). Initially large component bodies (e.g., [10.sup.-2] - [10.sup.-3] m diameter) were stretched and folded recursively by induced chaotic motions in polymer melts within both batch and continuous flow devices at shear rates below 10/s to yield blends with numerous layers. The ultimate refinement and number of layers were primarily dependent on the viscosity ratio and interfacial tension of the polymer components (4). Continued processing resulted in morphology transitions leading to a variety of blend morphologies that could be obtained via selection of melt residence...
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