Answer Happy

6. (15 pts) Polyvinyl chloride, PVC, is a very versatile polymer. For example, it is used extensively in piping and vinyl siding applications. A highly plasticized form is used to make IV bags. a.) Sketch stress versus strain curves for the version used in pipes and the highly plasticized version used to for IV bags. b.) Which version has the lower Tg? Explain. c.) The PVC used in pipes typically has a crystallinity of 10%. If the crystallinity increased to 30%, would the Tg increase or decrease? 7. (15 pts) Acrylonitrile butadiene styrene (ABS) is a type of thermoplastic copolymer used ta make insulin pens. The butadiene is a soft, rubbery monomer and the styrene is a stiff monomer. The typical Tg is 225°C. If you need to lower the Tg, how would you modify the copolymer (i.e. would you increase or decrease one of the monomers? Please give a brief explanation.