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






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






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






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






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






6. 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






7. 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






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






9. Atoms attached to the polymer backbone.






10. Softening agents






11. Relative configuration of adjecent asymmetric carbons






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






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






14. 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






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






16. 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






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






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






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






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






22. 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






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






24. Double bounded organic molecule used to begin addition polymerization






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






26. 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






27. Polymer that is made up a single repeat unit






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






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






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






31. Porcess of breaking large organic hydrocarbons into smaller molecules






32. Is not asymetric and cannot have multiple configurations






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






34. Number of bonds a molecule has formed






35. 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






36. Coloring agents that do not dissolve into the polymer






37. Simple polymeric material produced as pellets in large quantities






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






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






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






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






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






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






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






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






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






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






48. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.






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






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






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