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Polycarbonates (PC)  ©

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From 04/08/2015 through 3/25/2013

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Polycarbonate (PC) Applications

Polycarbonate (PC) Copolymers

Polyesters

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Notes

1. Description

“Polycarbonates (PC), known by the trademarked names Lexan, Makrolon, Makroclear and others, are a particular group of thermoplastic polymers. They are easily worked, molded, and thermoformed. Because of these properties, polycarbonates find many applications. Polycarbonates do not have a unique resin identification code and are identified as Other, 7.

Polycarbonates received their name because they are polymers containing carbonate groups (–O–(C=O)–O–). Most polycarbonates of commercial interest are derived from rigid monomers. A balance of useful features including temperature resistance, impact resistance and optical properties position polycarbonates between commodity plastics and engineering plastics.”

(Polycarbonates, Wikipedia, 3/25/2013)

2. Biodegradable Polycarbonates

US Patent 8,981,043 (March 17, 2015), “Catalytic System for CO2/Epoxide Copolymerization,” Jisu Jeong, Sujith Sudevan, Myungahn Ok, Jieun Yoo, BunYeoul Lee, and SungJae Na (SK Innovation Co., Ltd., Seoul, South Korea).

Biodegradable polymers are badly needed in an environmentally sensitive world, weary of growing landfills and atmospheric pollution.  Polycarbonates are very useful but are not biodegradable nor renewable.  In addition, using CO2 as a raw material, removes a warming gas from the atmosphere and is desirable.  

Jeong et al produced a polycarbonate by copolymerizing an epoxy with CO2 using cobalt(III) or chromium(III) catalysts. These catalysts are unique with high activities.  The polymerization process can be batch, semibatch, or continuous.  The resulting polymer number-average molecular weight (Mn) is 5,000 to 1,000,000 with molecular weight distributions (Mw/Mn) of 1.05 to 4.0.  The polycarbonate contains 80% or more carbonate linkages and is easily degradable with no residue or soot from combustion.  The materials are useful for packaging, insulation and coatings.

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Interested!!
Bookmark this page to follow future developments!.
(RDC 6/5/2012)

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Roger D. Corneliussen
Editor
www.maropolymeronline.com

Maro Polymer Links
Tel: 610 363 9920
Fax: 610 363 9921
E-Mail: cornelrd@bee.net  

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Copyright 2013 by Roger D. Corneliussen.
No part of this transmission is to be duplicated in any manner or forwarded by electronic mail without the express written permission of Roger D. Corneliussen
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* Date of latest addition; date of first entry is 3/25/2013.