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






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






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






4. 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






5. 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






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






7. Simple polymeric material produced as pellets in large quantities






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






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






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






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






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






13. Is not asymetric and cannot have multiple configurations






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






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






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






17. 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






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






19. Primary raw material for most polymers






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






21. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants






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






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






24. 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






25. Covalent bonding of the polymer backbone and side groups






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






27. 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






28. 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






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






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






31. 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






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






33. Coloring agents that do not dissolve into the polymer






34. Molecule containing a highly reactive unpaired electron






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






36. An acid and an alcohol






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






38. 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






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






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






41. Porcess of breaking large organic hydrocarbons into smaller molecules






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






43. 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






44. Relative configuration of adjecent asymmetric carbons






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






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






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






48. Polymer that is made up a single repeat unit






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






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