ME418 Lecture 3 Bio-polymers

ME418 Lecture 3 Bio-polymers - 3: Bio-polymers Saturday,...

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3: Bio-polymers Saturday, February 16, 2008 5:51 PM Bio-polymers o Cellulose (wood, cotton, paper, etc…) o Those made from renewable resources - non fossil fuels o Natural Rubber o Kopal Resin 1921-1931 Land-based amber brought in from Africa - petrified tree sap o Casein Plastics - main protein plastic in history Discovered by accident through formaldehyde + milk Whiteboard production Galalith (Gala = milk, lithos = stone) Buttons, etc. .. Practically non-existent now o Soy based protein plastics in the 1930s Car body panels, absorbed water and eventually warped (1939) Renewable resource movement Current Diverse Approaches to Bioplastics o Poly(lactic acid) PLA: derived from corn Current huge demand - fibers, thermoform (bottles) Looks just like PET, not high enough heat deflection (collapse under  pressure and elevated temperatures) Requires lots of energy (only net 20% savings in fossil fuels)
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This note was uploaded on 03/30/2008 for the course ME 418 taught by Professor Osswald during the Fall '08 term at Wisconsin.

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ME418 Lecture 3 Bio-polymers - 3: Bio-polymers Saturday,...

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