Rheology and extrusion foaming of chain-branched poly(lactic acid).(Report): An article from: Polymer Engineering and Science
Book Details
PublisherSociety of Plastics Engineers, Inc.
ISBN / ASINB003DN9B88
ISBN-13978B003DN9B88
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MarketplaceUnited States 🇺🇸
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This digital document is an article from Polymer Engineering and Science, published by Society of Plastics Engineers, Inc. on March 1, 2010. The length of the article is 7266 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available immediately after purchase. You can view it with any web browser.
From the author: In this study, the effect of macromolecular chain-branching on poly(lactic acid) (PLA) rheology, crystallization, and extrusion foaming was investigated. Two PLA grades, an amorphous and a semi-crystalline one, were branched using a multifunctional styrene-acrylic-epoxy copolymer. The branching of PLA and its foaming were achieved in one-step extrusion process. Carbon dioxide ([CO.sub.2]), in concentration up to 9%, was used as expansion agent to obtain foams from the two PLA branched using chain-extender contents up to 2%. The foams were investigated with respect to their shear and elongational behavior, crystallinity, morphology, and density. The addition of the chain-extender led to an increase in complex viscosity, elasticity, elongational viscosity, and in the manifestation of the strain-hardening phenomena. Low-density foams were obtained at 5-9% [CO.sub.2] for semi-crystalline PLA and only at 9% [CO.sub.2] in the case of the amorphous PLA. Differences in foaming behavior were attributed to crystallites formation during the foaming process. The rheological and structural changes associated with PLA chain-extension lowered the achieved crystallinity but slightly improved the foamability at low [CO.sub.2] content. POLYM. ENG. SCI., 50:629-642, 2010. [C] 2009 Society of Plastics Engineers
Citation Details
Title: Rheology and extrusion foaming of chain-branched poly(lactic acid).(Report)
Author: Mihaela Mihai
Publication:Polymer Engineering and Science (Magazine/Journal)
Date: March 1, 2010
Publisher: Society of Plastics Engineers, Inc.
Volume: 50 Issue: 3 Page: 629(14)
Article Type: Report
Distributed by Gale, a part of Cengage Learning
From the author: In this study, the effect of macromolecular chain-branching on poly(lactic acid) (PLA) rheology, crystallization, and extrusion foaming was investigated. Two PLA grades, an amorphous and a semi-crystalline one, were branched using a multifunctional styrene-acrylic-epoxy copolymer. The branching of PLA and its foaming were achieved in one-step extrusion process. Carbon dioxide ([CO.sub.2]), in concentration up to 9%, was used as expansion agent to obtain foams from the two PLA branched using chain-extender contents up to 2%. The foams were investigated with respect to their shear and elongational behavior, crystallinity, morphology, and density. The addition of the chain-extender led to an increase in complex viscosity, elasticity, elongational viscosity, and in the manifestation of the strain-hardening phenomena. Low-density foams were obtained at 5-9% [CO.sub.2] for semi-crystalline PLA and only at 9% [CO.sub.2] in the case of the amorphous PLA. Differences in foaming behavior were attributed to crystallites formation during the foaming process. The rheological and structural changes associated with PLA chain-extension lowered the achieved crystallinity but slightly improved the foamability at low [CO.sub.2] content. POLYM. ENG. SCI., 50:629-642, 2010. [C] 2009 Society of Plastics Engineers
Citation Details
Title: Rheology and extrusion foaming of chain-branched poly(lactic acid).(Report)
Author: Mihaela Mihai
Publication:Polymer Engineering and Science (Magazine/Journal)
Date: March 1, 2010
Publisher: Society of Plastics Engineers, Inc.
Volume: 50 Issue: 3 Page: 629(14)
Article Type: Report
Distributed by Gale, a part of Cengage Learning
