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mwyuer: ½ð±Ò+1, ¸Ðл»ØÌû½»Á÷ 2012-04-16 16:44:56
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3Â¥2012-04-16 21:51:16
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mwyuer: ½ð±Ò+1, ¸Ðл»ØÌû½»Á÷ 2012-04-17 08:50:09
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Polylactic acid is not a new material. It has been around for decades. In 1932, Wallace Carothers, a scientist for Dupont, produced a low molecular weight product by heating lactic acid under a vacuum. In 1954, after further refinements, Dupont patented Carothers' process (Lunt, James and Shafer, Andrew. "Polylactic Acid Polymers from Corn: Potential Applications in the Textiles Industry." Internet. Available (April 2002) http://www.cdpoly.com/pdf/lunttech.pdf) |
4Â¥2012-04-16 22:34:46
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5Â¥2012-05-17 08:32:17
zcx215
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