Q4) Which one of the three polymer types involves the greatest amount of cross-l

Question

Q4) Which one of the three polymer types involves the greatest amount of cross-linking: (a) elastomers, (b) thermoplastics, or (c) thermosets?

Q5) In some composite materials, a third ingredient is added to promote bonding of the primary and secondary phases. This third ingredient is called which one of the following: (a) adhesive, (b) binder, (c) interface, (d) interphase, or (e) joiner?

Q6) The rule of mixtures is used for which of the following purposes related to composite materials (one best answer): (a) calculating the proportions of each material to include in the composite material, (b) calculating the strength of a fiber-reinforced composite material, or (c) calculating the weighted average of the primary and secondary material properties?

Q7) As the temperature of an amorphous polymer decreases from the liquid state, the polymer changes from liquid to rubbery. As temperature continues to decline a temperature is reached at which the material becomes hard and brittle. This temperature is called which one of the following: (a) freezing point, (b) glass transition temperature, (c) melting temperature, or (d) recrystallization temperature?

Q8) Curing of thermosetting polymers is accomplished at the fabrication plants rather than the chemical plants that supply the starting materials: (a) true or (b) false?

Q9) Curing of elastomers is known as which one of the following terms: (a) crystallization, (b) firing, (c) reinforcing, (d) sintering, or (e) vulcanization?

Q10) A partially biodegradable plastic consists of which one of the following: (a) a polymer that is biodegradable and a natural filler that is not biodegradable, (b) a polymer that is not biodegradable and a natural filler that is biodegradable, (c) a polymer that requires more than 20 years to degrade naturally, or (d) two polymers but only one of which is biodegradable?

Explanation / Answer

4) thermosets

5) binder

6) c

7) b

8) b

9) e

10) d

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