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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






16. Molecule containing a highly reactive unpaired electron






17. 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






18. 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






19. Covalent bonding of the polymer backbone and side groups






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






21. 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






22. Polymer that is made up a single repeat unit






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






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






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






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






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






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






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






30. Atoms attached to the polymer backbone.






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






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






33. 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






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






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






36. 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






37. 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






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






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






40. 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






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






42. 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






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






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






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






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






47. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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