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Thermoplastic: Quiz

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Question 1: Many thermoplastic materials are addition polymers; e.g., vinyl chain-growth polymers such as polyethylene and ________.
Poly(methyl methacrylate)PolypropylenePolystyrenePolyethylene terephthalate

Question 2: As the temperature increases above Tm, ________ gradually decreases without any distinct phase change.
Surface tensionFluid dynamicsRheologyViscosity

Question 3: Thermoplastics are elastic and flexible above a ________ Tg, specific for each one—the midpoint of a temperature range in contrast to the sharp melting point of a pure crystalline substance like water.
Transparency and translucencyOptical fiberGlass transitionSol-gel

Question 4: Below a second, higher melting temperature, Tm, also the midpoint of a range, most thermoplastics have crystalline regions alternating with amorphous regions in which the chains approximate ________.
Flory–Huggins solution theoryPolymerProteinRandom coil

Question 5: Another method of lowering Tg (or raising Tm) is to incorporate the original plastic into a copolymer, as with graft copolymers of polystyrene, or into a ________.
PolyesterComposite materialFiber reinforced concreteCarbon fiber-reinforced polymer

Question 6: Thermoplastic polymers differ from thermosetting polymers (________) as they can, unlike thermosetting polymers, be remelted and remoulded.
United KingdomBakeliteBelgiumSpain

Question 7: The amorphous regions contribute elasticity and the crystalline regions contribute strength and rigidity, as is also the case for non-thermoplastic fibrous proteins such as ________.
SpandexSilkKente clothLinen

Question 8: Some typical examples of amorphous thermoplastics are ________, PS and PC.
Polyethylene terephthalatePolypropylenePolytetrafluoroethylenePoly(methyl methacrylate)

Question 9: Recently, ________ have become available.
Cross-linkCopolymerPolyurethaneThermoplastic elastomer

Question 10: A thermoplastic, also known as thermosoftening plastic,[1][2] is a ________ that turns to a liquid when heated and freezes to a very glassy state when cooled sufficiently.
Polymer chemistryPolyethylenePolymerNylon







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