Featured Research

from universities, journals, and other organizations

Inspired By Nature, Cornell Chemist Finds Way To Makebiodegradable Plastic That Imitates Bacteria

Date:
March 24, 2003
Source:
Cornell University
Summary:
Finding an economical way to make a polyester commonly found in many types of bacteria into a plastic with uses ranging from packaging to biomedical devices is a long-held scientific goal. Such a polymer would be a "green" plastic, in that it would be biodegradable.

NEW ORLEANS -- Finding an economical way to make a polyester commonly found in many types of bacteria into a plastic with uses ranging from packaging to biomedical devices is a long-held scientific goal. Such a polymer would be a "green" plastic, in that it would be biodegradable.

Geoffrey Coates, a professor of chemistry and chemical biology at Cornell University, Ithaca, N.Y., has partially achieved this goal by discovering a highly efficient chemical route for the synthesis of the polymer, known as poly(beta-hydroxybutyrate) or PHB. The thermoplastic polyester is widely found in nature, particularly in some bacteria, where it is formed as intracellular deposits and used as a storage form of carbon and energy. And yet it shares many of the physical and mechanical properties of petroleum-based polypropylene, with the added benefit of being biodegradable.

Coates reported on his research group's work with PHB in the first of two papers presented at the 225th national meeting of the American Chemical Society in New Orleans at 3:30 p.m. CST Sunday, March 23.

PHB currently is produced through a costly, energy-intensive biological process involving the fermentation of sugar. However, the Coates group's chemical route, once perfected, "is going to be a competitive strategy," the Cornell researcher believes.

In order to produce the polymer, the process first requires a monomer, in this case a lactone called beta-butyrolactone. This reacts with a zinc complex catalyst, discovered by Coates in the late 1990s, to make PHB.

The problem faced by the Coates group has been that beta-butyrolactone is a "handed" molecule, that is, it has two mirror images, like hands. Polymers produced from a mixture of two-handed forms have very poor properties. The researchers have been focusing on the development of a new catalyst for the production of the desired single-handed form of beta-butyrolactone, a process called carbonylation. The new catalyst, based on cobalt and aluminum, facilitates the addition of carbon monoxide to propylene oxide, an inexpensive ring compound called an epoxide. By using the commercially available handed form of propylene oxide in the reaction, the corresponding handed form of the lactone can be formed rapidly.

Coates is convinced that, "our carbonylation and polymerization processes are, in our opinion, the best." He adds, "A purely chemical route to a polymer that occurs in nature and is easily biodegradable is highly desirable."

Members of the Coates group at Cornell involved in the research include Yutan Getzler, Lee Rieth and Vinod Kundnani, all Ph.D. candidates, and postdoctoral associate Joseph Schmidt. The work was supported by the National Science Foundation, the Arnold and Mabel Beckman Foundation, the David and Lucile Packard Foundation, the Nanobiotechnology Center at Cornell and the Cornell Center for Materials Research.

Related Web site:

Geoffrey Coates -- http://www.chem.cornell.edu/department/Faculty/Coates/coates.html


Story Source:

The above story is based on materials provided by Cornell University. Note: Materials may be edited for content and length.


Cite This Page:

Cornell University. "Inspired By Nature, Cornell Chemist Finds Way To Makebiodegradable Plastic That Imitates Bacteria." ScienceDaily. ScienceDaily, 24 March 2003. <www.sciencedaily.com/releases/2003/03/030324063233.htm>.
Cornell University. (2003, March 24). Inspired By Nature, Cornell Chemist Finds Way To Makebiodegradable Plastic That Imitates Bacteria. ScienceDaily. Retrieved July 25, 2014 from www.sciencedaily.com/releases/2003/03/030324063233.htm
Cornell University. "Inspired By Nature, Cornell Chemist Finds Way To Makebiodegradable Plastic That Imitates Bacteria." ScienceDaily. www.sciencedaily.com/releases/2003/03/030324063233.htm (accessed July 25, 2014).

Share This




More Matter & Energy News

Friday, July 25, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

TSA Administrator on Politics and Flight Bans

TSA Administrator on Politics and Flight Bans

AP (July 24, 2014) TSA administrator, John Pistole's took part in the Aspen Security Forum 2014, where he answered questions on lifting of the ban on flights into Israel's Tel Aviv airport and whether politics played a role in lifting the ban. (July 24) Video provided by AP
Powered by NewsLook.com
Creative Makeovers for Ugly Cellphone Towers

Creative Makeovers for Ugly Cellphone Towers

AP (July 24, 2014) Mobile phone companies and communities across the country are going to new lengths to disguise those unsightly cellphone towers. From a church bell tower to a flagpole, even a pencil, some towers are trying to make a point. (July 24) Video provided by AP
Powered by NewsLook.com
Algonquin Power Goes Activist on Its Target Gas Natural

Algonquin Power Goes Activist on Its Target Gas Natural

TheStreet (July 23, 2014) When The Deal's Amanda Levin exclusively reported that Gas Natural had been talking to potential suitors, the Ohio company responded with a flat denial, claiming its board had not talked to anyone about a possible sale. Lo and behold, Canadian utility Algonquin Power and Utilities not only had approached the company, but it did it three times. Its last offer was for $13 per share as Gas Natural's was trading at a 60-day moving average of about $12.50 per share. Now Algonquin, which has a 4.9% stake in Gas Natural, has taken its case to shareholders, calling on them to back its proposals or, possibly, a change in the target's board. Video provided by TheStreet
Powered by NewsLook.com
Robot Parking Valet Creates Stress-Free Travel

Robot Parking Valet Creates Stress-Free Travel

AP (July 23, 2014) 'Ray' the robotic parking valet at Dusseldorf Airport in Germany lets travelers to avoid the hassle of finding a parking spot before heading to the check-in desk. (July 23) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

    Health News

      Environment News

        Technology News



          Save/Print:
          Share:

          Free Subscriptions


          Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

          Get Social & Mobile


          Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

          Have Feedback?


          Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
          Mobile: iPhone Android Web
          Follow: Facebook Twitter Google+
          Subscribe: RSS Feeds Email Newsletters
          Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins