The process in which the characteristic properties of these materials are specified is called “programming.” For 10 points each:
[10m] Name this class of physically or chemically cross-linked smart materials that consist of a hard segment and a switching segment. Their behavior is characterized by a cycle on a plot of temperature, stress, and strain.
ANSWER: shape-memory polymers [prompt on polymers or copolymers; reject “shape-memory alloys”]
[10e] In temperature responsive shape-memory polymers, the transition temperature is typically the melting temperature or this temperature, above which a polymer becomes rubbery.
ANSWER: glass transition temperature
[10h] This hyphenated phrase describes shape-memory alloys and polymers that display a shape-memory effect on both heating and cooling. It also describes catalytic converters that oxidize carbon monoxide and hydrocarbons, but that do not reduce nitrogen oxides.
ANSWER: two-way [accept two-way shape memory polymers or two-way shape memory alloys; accept two-way catalytic convertors]
<Geoffrey Chen, Chemistry>