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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. Coloring agents that do not dissolve into the polymer






2. 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






3. Double bounded organic molecule used to begin addition polymerization






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






5. Covalent bonding of the polymer backbone and side groups






6. 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






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






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






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






10. Polymer that is made up a single repeat unit






11. 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






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






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






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






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






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






17. 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






18. 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






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






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






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






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






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






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






27. Relative configuration of adjecent asymmetric carbons






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






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






30. 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






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






32. Is not asymetric and cannot have multiple configurations






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






34. 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






35. 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






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






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






38. Number of bonds a molecule has formed






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






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






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






42. Porcess of breaking large organic hydrocarbons into smaller molecules






43. Primary raw material for most polymers






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






45. Softening agents






46. 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






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






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






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. An acid and an alcohol