1. Identify two significant concepts (you pick) about polymers you learned in this class. Briefly explain each concept. 2. You are given a sample of polymer;, it is not obvious if it is cross-linked, filled or not filled. Explain how you would determine the Tg (glass transition temperature) 3. You are asked to identify a supplier who can mix two polymers with purified silica. You can pick the polymers. a) Explain how the supplier might prepare the most homogeneous mixture possible. b) For the specification, to what dimensional (nm, um, mm, cm, m etc...) scale do you expect that mixing may occur? 4. Regarding the polymer in question #2, your manager asks you to use it for a product that would typically be used above Tg and in a humid environment. What technical concerns do you need to explain to your manager so that they fully understand any possible risks? 5. During class you viewed a demonstration using two identical black rubber balls. Upon dropping from a height of 3' to 6' from the table or floor, one bounced and the other did not. a) explain why? b) if both balls were immersed into liquid nitrogen until they reached that temperature, explain what may happen if the balls are then dropped as before. 6. Cotton is a natural fiber that is almost pure cellulose. Propose a process for woven cotton fabrics that will reduce wrinkles and the need for ironing. Describe any reagents that might be used for the process and why they produce the desired outcome. но Structure of Cellulose
Show transcribed image text1. Identify two significant concepts (you pick) about polymers you learned in this class. Briefly explain each concept. 2. You are given a sample of polymer;, it is not obvious if it is cross-linked, filled or not filled. Explain how you would determine the Tg (glass transition temperature) 3. You are asked to identify a supplier who can mix two polymers with purified silica. You can pick the polymers. a) Explain how the supplier might prepare the most homogeneous mixture possible. b) For the specification, to what dimensional (nm, um, mm, cm, m etc...) scale do you expect that mixing may occur? 4. Regarding the polymer in question #2, your manager asks you to use it for a product that would typically be used above Tg and in a humid environment. What technical concerns do you need to explain to your manager so that they fully understand any possible risks? 5. During class you viewed a demonstration using two identical black rubber balls. Upon dropping from a height of 3' to 6' from the table or floor, one bounced and the other did not. a) explain why? b) if both balls were immersed into liquid nitrogen until they reached that temperature, explain what may happen if the balls are then dropped as before. 6. Cotton is a natural fiber that is almost pure cellulose. Propose a process for woven cotton fabrics that will reduce wrinkles and the need for ironing. Describe any reagents that might be used for the process and why they produce the desired outcome. но Structure of Cellulose