Morphology and mechanical properties of impact modified polypropylene blends.: An article from: Polymer Engineering and Science
Book Details
Author(s)Nathan Tortorella, Charles L. Beatty
PublisherSociety of Plastics Engineers, Inc.
ISBN / ASINB001L2RPY0
ISBN-13978B001L2RPY9
MarketplaceFrance 🇫🇷
Description
This digital document is an article from Polymer Engineering and Science, published by Society of Plastics Engineers, Inc. on November 1, 2008. The length of the article is 9634 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: Isotactic polypropylene (PP) has been reactively blended with various grades of an ethylene-octene copolymer (EOC) in a twin-screw extruder. Free radical polymerization of styrene and a multifunctional acrylate during melt extrusion has resulted in an enhancement of mechanical properties over the binary blend. The reactive blend exhibits a notched Izod impact strength over 12 times that of pure polypropylene and greater than double the performance of the binary blend. Electron microscopy shows that by grafting onto the polymers, elastomer particle size and interparticle distance decrease, while particle shape becomes less spherical. The acrylate is crucial to achieve superior performance, as infrared spectra correlate an increase in graft yield to improvements in stress-strain behavior and impact strength. In addition, melt flow index (MFI) and melt strength data indicate a reduction in unwanted side reactions of polypropylene and the presence of long-chain branching. Dynamic-mechanical analysis reveals that the reaction promotes miscibility between polypropylene and the EOC and reduces molecular mobility at their glass-transition temperatures. Mechanical properties, graft yield, and MFI are shown to be highly dependent upon the elastomer's concentration, density, and molecular weight, initiator and monomer concentration, as well as processing temperature. POLYM. ENG. SCI., 48:2098-2110, 2008.[C] 2008 Society of Plastics Engineers
Citation Details
Title: Morphology and mechanical properties of impact modified polypropylene blends.
Author: Nathan Tortorella
Publication:Polymer Engineering and Science (Magazine/Journal)
Date: November 1, 2008
Publisher: Society of Plastics Engineers, Inc.
Volume: 48 Issue: 11 Page: 2098(13)
Distributed by Gale, a part of Cengage Learning
From the author: Isotactic polypropylene (PP) has been reactively blended with various grades of an ethylene-octene copolymer (EOC) in a twin-screw extruder. Free radical polymerization of styrene and a multifunctional acrylate during melt extrusion has resulted in an enhancement of mechanical properties over the binary blend. The reactive blend exhibits a notched Izod impact strength over 12 times that of pure polypropylene and greater than double the performance of the binary blend. Electron microscopy shows that by grafting onto the polymers, elastomer particle size and interparticle distance decrease, while particle shape becomes less spherical. The acrylate is crucial to achieve superior performance, as infrared spectra correlate an increase in graft yield to improvements in stress-strain behavior and impact strength. In addition, melt flow index (MFI) and melt strength data indicate a reduction in unwanted side reactions of polypropylene and the presence of long-chain branching. Dynamic-mechanical analysis reveals that the reaction promotes miscibility between polypropylene and the EOC and reduces molecular mobility at their glass-transition temperatures. Mechanical properties, graft yield, and MFI are shown to be highly dependent upon the elastomer's concentration, density, and molecular weight, initiator and monomer concentration, as well as processing temperature. POLYM. ENG. SCI., 48:2098-2110, 2008.[C] 2008 Society of Plastics Engineers
Citation Details
Title: Morphology and mechanical properties of impact modified polypropylene blends.
Author: Nathan Tortorella
Publication:Polymer Engineering and Science (Magazine/Journal)
Date: November 1, 2008
Publisher: Society of Plastics Engineers, Inc.
Volume: 48 Issue: 11 Page: 2098(13)
Distributed by Gale, a part of Cengage Learning
