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






2. Atoms attached to the polymer backbone.






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






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






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






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






8. Covalent bonding of the polymer backbone and side groups






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






10. Molecule containing a highly reactive unpaired electron






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






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






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






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






15. 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






16. Simple polymeric material produced as pellets in large quantities






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






18. 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






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






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






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






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






23. 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






24. Double bounded organic molecule used to begin addition polymerization






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






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






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






28. Number of bonds a molecule has formed






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






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






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






32. 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






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






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






35. Is not asymetric and cannot have multiple configurations






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






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






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






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






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






41. Relative configuration of adjecent asymmetric carbons






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






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






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






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






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






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






48. 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






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






50. 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