Foaming behavior of high-melt strength polypropylene/clay nanocomposites.(Technical report): An article from: Polymer Engineering and Science
Book Details
Publisher
Society of Plastics Engineers, Inc.
ISBN / ASIN
B0030I6J4A
ISBN-13
978B0030I6J49
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This digital document is an article from Polymer Engineering and Science, published by Society of Plastics Engineers, Inc. on October 1, 2009. The length of the article is 8640 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: The foaming behavior of high-melt strength polypropylene (HMS-PP) and HMS-PP/Cloisite 20A nanocomposites (PPNC) was studied in a batch process. PPNCs with 2, 4, 8, and 10 wt% clay were prepared in a twin screw extruder. The morphology of the nanocomposites was studied using XRD and TEM. Subsequently, foaming experiments were conducted using supercritical [CO.sub.2] as the blowing agent in a batch process, and foams with cell sizes varying from the sub micrometer to the micro meter range were prepared. The effect of variation in saturation pressure and temperature, foaming temperature, foaming time, and quench temperature was determined experimentally. Dynamic rheological measurements were conducted to relate the influence of nanocomposites morphology with foam cell growth and nucleation. Extensional rheological measurements were also conducted to detect the presence of strain hardening effect at the foaming temperatures used in the experiment. It was found that the nucleation efficiency of clay reduces with increase in clay loading. Also, the optimum amount of filler for generation of fine celled foams was found to be around the percolation threshold of the polymer. The extended strain hardening effect shown by the polymer in presence of clay plays an important role in stabilizing foam cell sizes. POLYM. ENG. SCI., 49:2070-2084, 2009. [C]2009 Society of Plastics Engineers
Citation Details
Title: Foaming behavior of high-melt strength polypropylene/clay nanocomposites.(Technical report)
Author: Subhendu Bhattacharya
Publication:Polymer Engineering and Science (Magazine/Journal)
Date: October 1, 2009
Publisher: Society of Plastics Engineers, Inc.
Volume: 49 Issue: 10 Page: 2070(15)
Article Type: Technical report
Distributed by Gale, a part of Cengage Learning
From the author: The foaming behavior of high-melt strength polypropylene (HMS-PP) and HMS-PP/Cloisite 20A nanocomposites (PPNC) was studied in a batch process. PPNCs with 2, 4, 8, and 10 wt% clay were prepared in a twin screw extruder. The morphology of the nanocomposites was studied using XRD and TEM. Subsequently, foaming experiments were conducted using supercritical [CO.sub.2] as the blowing agent in a batch process, and foams with cell sizes varying from the sub micrometer to the micro meter range were prepared. The effect of variation in saturation pressure and temperature, foaming temperature, foaming time, and quench temperature was determined experimentally. Dynamic rheological measurements were conducted to relate the influence of nanocomposites morphology with foam cell growth and nucleation. Extensional rheological measurements were also conducted to detect the presence of strain hardening effect at the foaming temperatures used in the experiment. It was found that the nucleation efficiency of clay reduces with increase in clay loading. Also, the optimum amount of filler for generation of fine celled foams was found to be around the percolation threshold of the polymer. The extended strain hardening effect shown by the polymer in presence of clay plays an important role in stabilizing foam cell sizes. POLYM. ENG. SCI., 49:2070-2084, 2009. [C]2009 Society of Plastics Engineers
Citation Details
Title: Foaming behavior of high-melt strength polypropylene/clay nanocomposites.(Technical report)
Author: Subhendu Bhattacharya
Publication:Polymer Engineering and Science (Magazine/Journal)
Date: October 1, 2009
Publisher: Society of Plastics Engineers, Inc.
Volume: 49 Issue: 10 Page: 2070(15)
Article Type: Technical report
Distributed by Gale, a part of Cengage Learning
