7. Billy Bob's Yogurt Corporation is considering changing packaging materials on its best-selling"Yobecue" brand of low-fat barbecue-flavored yogurt. This product is currently packaged in glass jars.At Billy Bob's packaging plant,

the product is poured into the containers hot, right after going through a pasteurization process. The product hits the containers at a temperature of 95°C. Billy Bob's wants to save money on packaging, but they need to be sure that the high temperature of the product does not permanently distort (change the shape of) the container. (The product is later refrigerated, and is sold at about 5°C on the store shelf.) Billy Bob's would also like a tougher packaging material that can resist impacts, etc., better than the glass it currently uses.As Billy Bob's chief packaging engineer, your job is to help determine the best material to use. Based on their thermo-mechanical behavior, and on other factors such as cost (as well as some things not mentioned here), which of the following polymers would be suitable for molding into the shape of a 12oz. barbecue-flavored yogurt container? LDPE, HDPE, PP, PTFE, PVC, PET, acrylic, polycarbonate, polystyrene. (a) Make a careful and clear list of the factors that you are considering. There should be at least six factors on your list. (b) Make a table with one row for each of the above polymers and one column for each of the factors in part (a). Fill in the table with whatever quantitative or qualitative information you can find. You will have to consult a variety of online resources such as matweb.com. (c) Eliminate the polymers that are clearly unacceptable. (d) Of the remaining polymers, select one that you feel is the best choice. (Note: There are several wrong answers here, but not necessarily only one right answer.)