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






2. Double bounded organic molecule used to begin addition polymerization






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






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






5. 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






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






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






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






9. 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






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






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






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






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






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






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






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






17. 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






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






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






20. Atoms attached to the polymer backbone.






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






22. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






26. Form of the molecular weight of a sample of polymer chains determined by dividing the mass of the specimen by total number of mols present; always less than weight average molecular weight; all molecules regardless of size correlate well with Mn






27. 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






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






29. 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






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






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






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






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






34. Covalent bonding of the polymer backbone and side groups






35. 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






36. Molecule containing a highly reactive unpaired electron






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






38. Softening agents






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






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






41. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret






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






43. Polymer that is made up a single repeat unit






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






45. An acid and an alcohol






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






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






48. 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






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






50. Coloring agents that do not dissolve into the polymer