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






2. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group






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






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






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






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






7. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.






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






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






10. 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






11. Double bounded organic molecule used to begin addition polymerization






12. Covalent bonding of the polymer backbone and side groups






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






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






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






16. Coloring agents that do not dissolve into the polymer






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






18. Porcess of breaking large organic hydrocarbons into smaller molecules






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






20. 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






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






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






23. Relative configuration of adjecent asymmetric carbons






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






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






26. 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






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






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






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






30. Molecule containing a highly reactive unpaired electron






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






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






33. Simple polymeric material produced as pellets in large quantities






34. Number of bonds a molecule has formed






35. Atoms attached to the polymer backbone.






36. 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






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






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






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






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






41. 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






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






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






44. 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






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






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






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






48. An acid and an alcohol






49. Additives whose primary purpose is to reduce the final cost of the product






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