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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. 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






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






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






5. 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






6. Simple polymeric material produced as pellets in large quantities






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






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






9. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.






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






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






12. 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






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






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






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






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






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






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






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






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






21. Additives that cause swelling - which allows the polymer chains to slide past one another more easily - making the polymer softer and more pliable. also used to decrease the viscosity of cement paste to make it easier to flow






22. 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






23. Coloring agents that do not dissolve into the polymer






24. 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






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






27. Relative configuration of adjecent asymmetric carbons






28. 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






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






30. Is not asymetric and cannot have multiple configurations






31. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






35. An acid and an alcohol






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






37. Molecule containing a highly reactive unpaired electron






38. Number of bonds a molecule has formed






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






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






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






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






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






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






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






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






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






48. 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






49. Covalent bonding of the polymer backbone and side groups






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