Injection molding of long sisal fiber-reinforced polypropylene: effects of compatibilizer concentration and viscosity on fiber adhesion and thermal ... article from: Polymer Engineering and Science
Book Details
PublisherSociety of Plastics Engineers, Inc.
ISBN / ASINB000AJQUI2
ISBN-13978B000AJQUI2
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This digital document is an article from Polymer Engineering and Science, published by Society of Plastics Engineers, Inc. on April 1, 2005. The length of the article is 5239 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: A two-step process was used to obtain long sisal fiber-polypropylene (SF/PP)-reinforced thermoplastic composites, using maleic anhydride grafted polypropylene (MA-g-PP) as a compatibilizer. At a first stage, modified polypropylenes (mPP) were used for an extrusion impregnation process, for the preparation of composite pellets containing about 70 wt% of SF. SF/mPP pellets with a large aspect ratio were prepared by continuous extrusion impregnation of a continuous SF yarn, using a single screw extruder and an adequate impregnation die. The mPP used were MA-g-PP and regular polypropylene (PP), modified by reaction with different amounts of an organic peroxide. The composite pellets were thus dry blended with regular PP pellets in an injection machine hopper, and injection molded to obtain composite tensile specimens with a minimum quantity of modified polypropylene, minimum fiber breakage and thermal degradation, and excellent mechanical properties. It is shown that the fiber breakage is reduced to a minimum, even for recycled composites, due to the presence of the low-viscosity polymer layer wetting the SF fibers. The bulk composite effective viscosity and the fiber breakage extent and thermal degradation during the injection-molding step are found to be closely related. Blending with much less expensive mPP at the impregnation stage optimizes the amount of expensive MA-g-PP. POLYM. ENG. SCI., 45:613-621, 2005. [c] 2005 Society of Plastics Engineers
Citation Details
Title: Injection molding of long sisal fiber-reinforced polypropylene: effects of compatibilizer concentration and viscosity on fiber adhesion and thermal degradation.
Author: L.M. Arzondo
Publication:Polymer Engineering and Science (Refereed)
Date: April 1, 2005
Publisher: Society of Plastics Engineers, Inc.
Volume: 45 Issue: 4 Page: 613(9)
Distributed by Thomson Gale
From the author: A two-step process was used to obtain long sisal fiber-polypropylene (SF/PP)-reinforced thermoplastic composites, using maleic anhydride grafted polypropylene (MA-g-PP) as a compatibilizer. At a first stage, modified polypropylenes (mPP) were used for an extrusion impregnation process, for the preparation of composite pellets containing about 70 wt% of SF. SF/mPP pellets with a large aspect ratio were prepared by continuous extrusion impregnation of a continuous SF yarn, using a single screw extruder and an adequate impregnation die. The mPP used were MA-g-PP and regular polypropylene (PP), modified by reaction with different amounts of an organic peroxide. The composite pellets were thus dry blended with regular PP pellets in an injection machine hopper, and injection molded to obtain composite tensile specimens with a minimum quantity of modified polypropylene, minimum fiber breakage and thermal degradation, and excellent mechanical properties. It is shown that the fiber breakage is reduced to a minimum, even for recycled composites, due to the presence of the low-viscosity polymer layer wetting the SF fibers. The bulk composite effective viscosity and the fiber breakage extent and thermal degradation during the injection-molding step are found to be closely related. Blending with much less expensive mPP at the impregnation stage optimizes the amount of expensive MA-g-PP. POLYM. ENG. SCI., 45:613-621, 2005. [c] 2005 Society of Plastics Engineers
Citation Details
Title: Injection molding of long sisal fiber-reinforced polypropylene: effects of compatibilizer concentration and viscosity on fiber adhesion and thermal degradation.
Author: L.M. Arzondo
Publication:Polymer Engineering and Science (Refereed)
Date: April 1, 2005
Publisher: Society of Plastics Engineers, Inc.
Volume: 45 Issue: 4 Page: 613(9)
Distributed by Thomson Gale
