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






2. 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






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






4. Relative configuration of adjecent asymmetric carbons






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






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






7. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed






8. Softening agents






9. 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






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






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






12. Atoms attached to the polymer backbone.






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






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






15. 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






16. 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






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






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






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






20. Primary raw material for most polymers






21. Number of bonds a molecule has formed






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






23. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group






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






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






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






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






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






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






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






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






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






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






34. Double bounded organic molecule used to begin addition polymerization






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






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






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






38. 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






39. 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






40. 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






41. Is not asymetric and cannot have multiple configurations






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






43. Porcess of breaking large organic hydrocarbons into smaller molecules






44. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion






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






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






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






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






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






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