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Modern Material Science And Engineering 2

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber






2. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed






3. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants






4. Covalently bonded chains of molecules with small monomer units repeated from end to end






5. Simple polymeric material produced as pellets in large quantities






6. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color






7. Polymers that contain amide (- N-) groups in the chain






8. Conformation that occurs when the largest substituent in a molecule are offset by 60






9. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer






10. Part of the polymer processing apparatus through which the polymer is pushed - causing the polymer to form a simple shape - such as a rod or tube






11. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals






12. Relative configuration of adjecent asymmetric carbons






13. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings






14. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)






15. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end






16. Polymer made up of two of more differenet monomers covalently bonded together






17. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability






18. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air






19. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties






20. Specific arrangements of atoms that cause organic compounds to behave in predictable ways






21. Atoms attached to the polymer backbone.






22. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...






23. Primary raw material for most polymers






24. One of the two different types of termination in the polymerization process. during this type of termination - the free radicals from two different polymer chains join to end the propogation process






25. Process used to make thermoset fibers by performing the polymerization reacting in a solbent as the material flows through a spinneret and into a quenching bath






26. Formation of a plymer that occurs when two potentially reactive end groups on a polymer react to form a new covalent bond between the polymer chains. this reaction also forms a biproduct - usually water






27. Polymer that is made up a single repeat unit






28. Pigments or dyes that change the way light is absorbed or reflected by a polymer






29. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit






30. Carbon atom capable of multiple configurations due to four different substituents






31. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds






32. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants






33. Conformation in which the largest substituents are offset by 180






34. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion






35. Polymers comprised of two or more different monomers that attach to the chain in long runs of one type of monomer - followed by another monomer AAAAAAAAAAAAABBBBBBBBBBBBBBBBBBAAAAAAAA






36. Two or more polymers mechanically mixed together but without covalent bonding between them






37. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets






38. Number of bonds a molecule has formed






39. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain






40. Form of the molecular weight of a sample of polymer chains determined by dividing the mass of the specimen by total number of mols present; always less than weight average molecular weight; all molecules regardless of size correlate well with Mn






41. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed






42. Smallest repeating unit in a polymer. aka repeat unit






43. Second- order thermodynamic transition in which the onset of large scale chain mobility occures in polymers. Bellow Tg the polymer is glasslike and brittle. above Tg the polymer becomes rubbery and flexible






44. One type of polymer that contains at least 85% of polyacrylonitrile PAN






45. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process






46. Formation of a polymer that occurs when two potentially reactive end groups on a polymer react to form a new covalent bond between the polymer chain. this reaction also forms a byproduct - which is typically water






47. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings






48. Softening agents






49. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance






50. Broad category of polymers that includes polymers containing urethane linkages