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






2. Relative configuration of adjecent asymmetric carbons






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






4. Coloring agents that do not dissolve into the polymer






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






6. Number of bonds a molecule has formed






7. Covalent bonding of the polymer backbone and side groups






8. Polymer that is made up a single repeat unit






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






10. 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






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






12. 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






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






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






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






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






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






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






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






20. An acid and an alcohol






21. Primary raw material for most polymers






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






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






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






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






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






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






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






30. 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






31. Two or more polymers mechanically mixed together but without covalent bonding between them






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






33. 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






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






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






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






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






38. 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






39. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






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






45. 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






46. 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






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






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






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






50. 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