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






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






3. Is not asymetric and cannot have multiple configurations






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






5. Term used to represent the average molecular weight of a sample containing a wide range of polymer chain lengths. this term is used to avoid confusion between the number average and the weight molecular average weight






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






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






8. Simple polymeric material produced as pellets in large quantities






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






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






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






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






13. An acid and an alcohol






14. 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






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






16. Coloring agents that do not dissolve into the polymer






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






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






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






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






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






22. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains






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






24. Covalent bonding of the polymer backbone and side groups






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






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






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






28. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups






29. 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






30. Softening agents






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






32. 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






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






34. Molecule containing a highly reactive unpaired electron






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






36. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device






37. 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






38. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.






39. Atoms attached to the polymer backbone.






40. Porcess of breaking large organic hydrocarbons into smaller molecules






41. Number of bonds a molecule has formed






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






43. 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






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






45. Part of the extrusion apparatus that contains a heated screw which is used to melt the polymer and the polymer forward into the next chamber






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






47. Double bounded organic molecule used to begin addition polymerization






48. Configuration of a substituent in a polymer - in which the substituent is located on the same side of the polymer chain in all repeating units






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






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