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Test your basic knowledge |

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






2. Molecule containing a highly reactive unpaired electron






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






4. 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






5. Coloring agents that do not dissolve into the polymer






6. Double bounded organic molecule used to begin addition polymerization






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






8. 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






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






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






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






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






13. 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






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






15. Simple polymeric material produced as pellets in large quantities






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






17. 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






18. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer






19. Primary raw material for most polymers






20. 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






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






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






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






24. 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






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






26. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light






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






28. 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






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






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






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






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






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






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






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






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






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






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






39. 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






40. 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






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






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






43. Covalent bonding of the polymer backbone and side groups






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






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






46. An acid and an alcohol






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






48. Is not asymetric and cannot have multiple configurations






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






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






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