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Unformatted text preview: POLYMER PROCESSING - FALL 1996 NAME:___________________________ EMA 4666C - EXAM II STUDENT #:______________________ EXAM IV Thursday, December 12, 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 1. Give a commercial name and the appropriate value for each critical temperature that would be required for injection molding the resin. Mark any space as NA if it is not applicable. Give a value for Tg or Tm whichever is appropriate. (20 pts) Polymer Tradename Tg Tm Poly(ethylene) Poly(styrene) Poly(ethylene terephthalate) Poly(arylene etherimide) Poly(dimethylsiloxane) Poly(hexamethylene adipamide) (Nylon 6,6) Poly(styrene-co-acrylonitrile) Poly(propylene) Poly(methyl methacrylate) Poly(bisphenol A carbonate) POLYMER PROCESSING - FALL 1996 NAME:___________________________ EMA 4666C - EXAM II STUDENT #:______________________ Part II: Indicate whether the following statements are TRUE or FALSE . Give an explanation if the statement is false. (12 pts) 1. Cooling rate of an injection molded plastic is independent of crystallite volume fraction and morphology. 2. Reaction injection molding cycle times are dependent upon the catalyst concentration. 3. The modulus of a unidirectional fiber reinforced composite scales inversely with the volume fraction of fiber when loaded in tension (parallel to the long axis of the fiber)....
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This note was uploaded on 07/17/2011 for the course EMA 4666c taught by Professor Brennan during the Spring '08 term at University of Florida.
- Spring '08