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Friday, June 05, 2009

corny plastic

Today is World Environment Day. Let me share with you something which is kind of related.

My final year project was on biodegradable polymers and one of the biodegradable polymers studied was polylactic acid (PLA). Lactic acid is made from dextrose by fermentation of starch, which can come from corn, sugarcane or other starch-rich products. The following is a clip from HowStuffWorks on making of corn plastic.


Not only are bioplastics biodegradable, they also free up the reliance on fossil-based resources. However it is not as simple as growing more corns. We have to consider whether it takes more energy to process and manufacture it and also the environmental impact from cradle to grave.

And, how would people react if they find their forks taste corny.

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3 Comments:

  • if i am not wrong, there are corn based utensils in singapore. maybe you can be the first one to find out how the fork tastes like. :D

    By Blogger Mei, at 6/05/2009 11:56:00 PM  

  • ah yes. PLA. They use it as a bioresorbable implant too. PLLA (poly L-lactic acid), PLGA (glycolic acid) are the common ones.

    By Blogger snoookems, at 6/06/2009 01:24:00 AM  

  • mei: yup I think they do sell corn based food containers in the supermarket, but the problem is when they are being disposed of together with normal plastics, it kind of lost the meaning. They could be used as fertilisers.

    snookem: wow cool! Thanks for sharing the info~ Biopolymers have lots of potential in the medical field, be in implants or drug delivery systems.

    By Blogger chillycraps, at 6/06/2009 09:23:00 AM  

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