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






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






3. Process of pushing polymers through a spinneret and winding the solidified fibers onto a tow - which imposes a shear stress on the fibers upstream as they emerge from the spinneret






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






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






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






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






8. Covalent bonding of the polymer backbone and side groups






9. Coloring agents that do not dissolve into the polymer






10. Molecule containing a highly reactive unpaired electron






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






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






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






14. 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






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






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






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






18. 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






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






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






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






22. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






26. Number of bonds a molecule has formed






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






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






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






30. Softening agents






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






32. Relative configuration of adjecent asymmetric carbons






33. Double bounded organic molecule used to begin addition polymerization






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






35. Is not asymetric and cannot have multiple configurations






36. 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






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






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






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






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






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






42. Simple polymeric material produced as pellets in large quantities






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






44. 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






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






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






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






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






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






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