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






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






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






4. 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






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






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






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






8. Coloring agents that do not dissolve into the polymer






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






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






11. Is not asymetric and cannot have multiple configurations






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






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






14. Number of bonds a molecule has formed






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






17. Primary raw material for most polymers






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






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






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






21. Softening agents






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






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






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






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






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






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






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






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






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






31. 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






32. 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






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






34. Molecule containing a highly reactive unpaired electron






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






36. 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






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






38. Polymer that is made up a single repeat unit






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






40. Atoms attached to the polymer backbone.






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






42. 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






43. 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






44. One of the two different types of termination in the polymerization process. during this type of termination - the free radicals from two different polymer chains join to end the propogation process






45. 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






46. Double bounded organic molecule used to begin addition polymerization






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






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






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






50. An acid and an alcohol