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






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






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






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






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






6. 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






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






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






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






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






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






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






14. 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






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






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






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






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






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






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






21. Softening agents






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






23. Molecule containing a highly reactive unpaired electron






24. Number of bonds a molecule has formed






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






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






27. 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






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






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






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






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






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






33. Atoms attached to the polymer backbone.






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






35. 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






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






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






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






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






40. 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






41. 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






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






43. 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






44. Polymer that is made up a single repeat unit






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






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






47. 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






48. Primary raw material for most polymers






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






50. Relative configuration of adjecent asymmetric carbons