quiz9fall00 - ENSC 3313,Fall 2000 Answer anv 4 Questions...

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ENSC 3313, Fall 2000 Answer anv 4 Questions onlv, 1 point each This is a common text diagram. What is the theme, please? Temperature (OF) 4 150 200 250 300 350 400 450 10 I I! I I I I I I The properties of amomhous polymers (C) fall off rapidly above the glass transition temperature. Cross linking (B) imparts rigidity, while crystalline polymers (A) are rigid up to their melting temperatures. 106 10~ I 'iO n. ~ 10' S - '""t. ~ 10 .,. ~ "5 "0 O E c .2 ~ 10- "' -0; It: 105 A 104 103 102 i 10 1 10. 150 Temperature rC) 200 250 50 100 2. Identify 4 different polymers ~ state an example use of each. Add explanatory comments as needed (e.g. plasticized, low density). High density polyethylene milk cartons -cheap, moldable, inert. Polyethyleneterephthelate (PET) drink containers -clear, heat resistant, moldable. Polyvinyl chloride sewer pipe -not plasticized. Polymethylmethacrylate, Plexiglas -transparent Polytetrafluoroethylene (PTFE), teflon, non stick, surfaces unreactive -Butadiene-styrene rubber for auto tires, BS rubber, copolymer.
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quiz9fall00 - ENSC 3313,Fall 2000 Answer anv 4 Questions...

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