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






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






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






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






5. 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






6. Simple polymeric material produced as pellets in large quantities






7. 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






8. 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






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






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






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






12. Number of bonds a molecule has formed






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






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






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






16. Porcess of breaking large organic hydrocarbons into smaller molecules






17. 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






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






19. 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






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






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






22. 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






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






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






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






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






27. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion






28. Primary raw material for most polymers






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






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






31. 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






32. Covalent bonding of the polymer backbone and side groups






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






34. Molecule containing a highly reactive unpaired electron






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






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






37. 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






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






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






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






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






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






43. Atoms attached to the polymer backbone.






44. 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






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






46. An acid and an alcohol






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






48. 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






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






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