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. 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






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






3. 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






4. Relative configuration of adjecent asymmetric carbons






5. Is not asymetric and cannot have multiple configurations






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






7. An acid and an alcohol






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






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






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






11. 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






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






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






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






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






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






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






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






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






21. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups






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






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






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






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






26. Number of bonds a molecule has formed






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






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






29. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






32. Simple polymeric material produced as pellets in large quantities






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






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






35. Covalent bonding of the polymer backbone and side groups






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. Polymer that is made up a single repeat unit






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






39. 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






40. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed






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






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






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






44. 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






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






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






47. Softening agents






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






49. 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






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