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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. 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






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






3. Coloring agents that do not dissolve into the polymer






4. 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






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






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






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






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. Porcess of breaking large organic hydrocarbons into smaller molecules






10. 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






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






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






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






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






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






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






17. Is not asymetric and cannot have multiple configurations






18. 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






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






20. 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






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






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






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






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






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






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






27. Number of bonds a molecule has formed






28. Primary raw material for most polymers






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






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






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






32. 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






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






34. 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






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






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






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






38. 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






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






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






41. Relative configuration of adjecent asymmetric carbons






42. Molecule containing a highly reactive unpaired electron






43. Low- molecular- weight building blocks repeated in the polymer chain






44. An acid and an alcohol






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






46. Softening agents






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






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






49. 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






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