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






2. 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






3. 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






4. 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






5. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber






6. 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






7. Covalent bonding of the polymer backbone and side groups






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






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






10. 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






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






12. Is not asymetric and cannot have multiple configurations






13. Primary raw material for most polymers






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






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






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






17. 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






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. One method of expressing the molecular weight of sample of polymers with averaging based on weight; this method is more useful when large molecules in the sample dominate the behavior






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






21. Atoms attached to the polymer backbone.






22. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






26. Softening agents






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






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






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






30. 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






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






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






33. 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






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






35. 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






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






37. Relative configuration of adjecent asymmetric carbons






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






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






40. 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






41. Coloring agents that do not dissolve into the polymer






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






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






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






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






46. Simple polymeric material produced as pellets in large quantities






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






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






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






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