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






2. Coloring agents that do not dissolve into the polymer






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






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






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






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






7. 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






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






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






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






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






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






13. 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






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






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






16. Simple polymeric material produced as pellets in large quantities






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






19. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals






20. 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






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






22. 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






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






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






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






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






27. 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






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






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






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






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






32. 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






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






34. Low- molecular- weight building blocks repeated in the polymer chain






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






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






37. 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






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






39. 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






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






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






42. Relative configuration of adjecent asymmetric carbons






43. An acid and an alcohol






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






45. Is not asymetric and cannot have multiple configurations






46. Covalent bonding of the polymer backbone and side groups






47. 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






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






49. 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






50. Double bounded organic molecule used to begin addition polymerization