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






2. One of the two different types of termination in the polymerization process. during this type of termination - the free radicals from two different polymer chains join to end the propogation process






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






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






5. 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






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






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






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






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






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






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






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






13. 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






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






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






16. Coloring agents that do not dissolve into the polymer






17. Is not asymetric and cannot have multiple configurations






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






19. An acid and an alcohol






20. 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






21. 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






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






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






24. Number of bonds a molecule has formed






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






26. Atoms attached to the polymer backbone.






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






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






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






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






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






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






33. Polymer that is made up a single repeat unit






34. 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






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






36. 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






37. Relative configuration of adjecent asymmetric carbons






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






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






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






41. Primary raw material for most polymers






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






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






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






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






46. 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






47. Double bounded organic molecule used to begin addition polymerization






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






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






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