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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. 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






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






3. Process of pushing polymers through a spinneret and winding the solidified fibers onto a tow - which imposes a shear stress on the fibers upstream as they emerge from the spinneret






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






5. Coloring agents that do not dissolve into the polymer






6. 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






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






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






9. Softening agents






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






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






12. Primary raw material for most polymers






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






14. 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






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






16. 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






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






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






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






20. Relative configuration of adjecent asymmetric carbons






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






22. 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






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






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






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






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






27. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end






28. Polymer that is made up a single repeat unit






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






30. 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






31. Is not asymetric and cannot have multiple configurations






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






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






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






35. Number of bonds a molecule has formed






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






37. Polymers that contain amide (- N-) groups in the chain






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






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






40. 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






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






42. 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






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






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






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






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






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






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






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






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