The polymer polylactic acid (see structure (2)) was used for a while to replace polyethylene terephthalate (PETE)
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The polymer polylactic acid (see structure (2)) was used for a while to replace polyethylene terephthalate (PETE) in the bags containing certain kinds of snack foods. However, polylactic acid is stiffer than PETE and so the bags made loud crackling sounds when they were handled. The problem was solved by using a special adhesive between the layers of the bags. Compare the structures of polylactic acid and PETE and suggest a reason why polylactic acid chains are more rigid than those of PETE.
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Related Book For 
Chemical Principles The Quest For Insight
ISBN: 9781464183959
7th Edition
Authors: Peter Atkins, Loretta Jones, Leroy Laverman
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