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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. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret






2. Polymer that is made up a single repeat unit






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






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






5. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads






6. Long chain polymers that contain at least 85% of an ester of a substituted aromatic carboxylic acid. these fibers are strong and can dyed or made transpared






7. Number of bonds a molecule has formed






8. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination






9. 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






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






11. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties






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






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






14. First step in the process of polymerization - during which a free radical is formed






15. 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






16. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit






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






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. Arrangement of the largest substituents where the substituets are offset by 120






20. Process of pushing polymers through a spinneret and winding the solidified fibers onto a tow - which imposes a shear stress on the fibers upstream as they emerge from the spinneret






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






22. 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






23. Additives that cause swelling - which allows the polymer chains to slide past one another more easily - making the polymer softer and more pliable. also used to decrease the viscosity of cement paste to make it easier to flow






24. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer






25. 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






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






27. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern






28. Primary raw material for most polymers






29. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret






30. Is not asymetric and cannot have multiple configurations






31. Relative configuration of adjecent asymmetric carbons






32. Simple polymeric material produced as pellets in large quantities






33. Atoms attached to the polymer backbone.






34. Covalent bonding of the polymer backbone and side groups






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






36. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly






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






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






39. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel






40. Coloring agents that do not dissolve into the polymer






41. 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






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






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






44. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group






45. An acid and an alcohol






46. Number of repeat/structural units in a polymer chain






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






48. Low- molecular- weight building blocks repeated in the polymer chain






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






50. 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