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






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






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






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






5. 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






6. 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






7. Number of bonds a molecule has formed






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






9. Is not asymetric and cannot have multiple configurations






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






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






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






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






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






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






16. 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






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






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






19. 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






20. 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






21. Relative configuration of adjecent asymmetric carbons






22. Coloring agents that do not dissolve into the polymer






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






24. Simple polymeric material produced as pellets in large quantities






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






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






27. 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






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






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






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






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






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






33. 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






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






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






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






37. Polymer that is made up a single repeat unit






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






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






40. Primary raw material for most polymers






41. Softening agents






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






43. Carbon atom capable of multiple configurations due to four different substituents






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






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






46. Covalent bonding of the polymer backbone and side groups






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






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






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






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






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