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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. Softening agents






2. Simple polymeric material produced as pellets in large quantities






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






4. Polymer that is made up a single repeat unit






5. 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






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






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






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






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






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






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






12. 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






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






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






15. 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






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






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






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






19. Is not asymetric and cannot have multiple configurations






20. 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






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






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






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






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






25. Coloring agents that do not dissolve into the polymer






26. Atoms attached to the polymer backbone.






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






28. 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






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






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






31. 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






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






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






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






35. 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






36. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property






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






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






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






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






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






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






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






44. Number of bonds a molecule has formed






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






46. Formation of side chains along the backbone; presence of branches disrupts the interactions beween adjacent chains; lowering the tensile strength - melting point - stiffness - crystallinity - and density






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






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






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






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