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Modern Material Science And Engineering 2

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
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  • 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. 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






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






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






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






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






6. Atoms attached to the polymer backbone.






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






8. 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






9. 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






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






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






12. Polymer that is made up a single repeat unit






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






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






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






16. 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






17. Coloring agents that do not dissolve into the polymer






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






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






20. Double bounded organic molecule used to begin addition polymerization






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






23. Molecule containing a highly reactive unpaired electron






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






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






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






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






28. Covalently bonded chains of molecules with small monomer units repeated from end to end






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






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






31. 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






32. Softening agents






33. 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






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






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






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






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






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






39. 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






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






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






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






43. 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






44. Simple polymeric material produced as pellets in large quantities






45. 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






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






47. Relative configuration of adjecent asymmetric carbons






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






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






50. Is not asymetric and cannot have multiple configurations