Continuous extrusion of microcellular polycarbonate.: An article from: Polymer Engineering and Science

This digital document is an article from Polymer Engineering and Science, published by Society of Plastics Engineers, Inc. on July 1, 2003. The length of the article is 5554 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: Extruded microcellular foams have been obtained from mixtures of polycarbonate (PC) and n-pentane. Cell diameters were in the range of 2 to 5 [micro]m and the foam densities varied between 400 and 700 kg/[m.sup.3]. Although two types of PC have been investigated, one linear and one branched, the presence of side branchings did not modify the extruded foam characteristics. Use of carbon dioxide as the blowing agent was also attempted, and cell sizes below 10 [micro]m have been successfully obtained. One prerequisite for microcellular foaming was believed to consist ill a concentration of the blowing agent dose to its limit of solubility as that defined tinder the actual processing conditions of pressure and temperature. This hypothesis was validated from the observation of extrusion of regular PC foams (intermediate to low densities and cell sizes ranging between 100 [micro]m and 1 mm) using moderate concentrations of blowing agents, and from solubility and viscosity measurements on similar polymer/blowing agent systems.

Citation Details
Title: Continuous extrusion of microcellular polycarbonate.
Author: Richard Gendron
Publication:Polymer Engineering and Science (Refereed)
Date: July 1, 2003
Publisher: Society of Plastics Engineers, Inc.
Volume: 43 Issue: 7 Page: 1361(17)

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