Question 16.1: Materials Selection for Polymer Components Discuss the type ......
Materials Selection for Polymer Components
Discuss the type of polymer you might select for the following applications: a surgeon’s glove, a beverage container, and a pulley.
The glove must be capable of stretching a great deal in order to slip onto the surgeon’s hand, yet it must conform tightly to the hand to permit the maximum sensation of touch during surgery. A material that undergoes a large amount of elastic strain—particularly with relatively little applied stress—might be appropriate; this requirement describes an elastomer.
The beverage container should be easily and economically produced. It should have some ductility and toughness so that it does not accidentally shatter and leak the contents. If the beverage is carbonated, diffusion of CO_{2} is a major concern (Chapter 5). A thermoplastic such as polyethylene terephthalate (PET) will have the necessary formability and strength needed for this application. It is also easily recycled.
The pulley will be subjected to some stress and wear as a belt passes over it. A relatively strong, rigid, hard material is required to prevent wear, so a thermosetting polymer might be most appropriate.