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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. 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






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






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






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






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






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






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






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. 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






10. Molecule containing a highly reactive unpaired electron






11. Coloring agents that do not dissolve into the polymer






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






13. Simple polymeric material produced as pellets in large quantities






14. Is not asymetric and cannot have multiple configurations






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






16. 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






17. An acid and an alcohol






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






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






20. 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






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






22. Double bounded organic molecule used to begin addition polymerization






23. Relative configuration of adjecent asymmetric carbons






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






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






26. Softening agents






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






28. Polymer that is made up a single repeat unit






29. Atoms attached to the polymer backbone.






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






31. 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






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






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






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






35. 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






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






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






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






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






40. 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






41. 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






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






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






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






45. Covalent bonding of the polymer backbone and side groups






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






47. Primary raw material for most polymers






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






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






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