F96EXAM3 - POLYMER PROCESSING FALL 1996 EMA 4666C EXAM II...

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POLYMER PROCESSING - FALL 1996 NAME:___________________________ EMA 4666C - EXAM II STUDENT #:______________________ Name____________________________ Student Number:_________________________ EXAM III (120 minutes) Tuesday, November 26, 1996 HONOR CODE : We, the members of the University of Florida community, pledge to hold ourselves and our peers to the highest standards of honesty and integrity * . Signature _____________________________________________________ Part I: Polymer Structure and Properties (16 pts) Draw the repeat units for the following polymers. Indicate the type of polymerization process used to manufacture each of the structures and the Tg. (8pts) 1. Poly(tetrafluoroethylene) 2. Poly(butadiene) 3. Poly(vinyl chloride) 4. Poly(phenylene sulfide) 1
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Part II: Indicate whether the following statements are TRUE or FALSE . Give an explanation if the statement is false. (12 pts) 1. Crystallization rates increase with increasing blow up ratio. 2. Creep resistance decreases with degree of polymerization. 3. Weld line strength decreases with increasing Deborah number. 4. Voids in moldings can be decreased by reducing cushion volume and increasing ram pressure.
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