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






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






3. Polymer that is made up a single repeat unit






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






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






6. Atoms attached to the polymer backbone.






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






8. Relative configuration of adjecent asymmetric carbons






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






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






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






12. 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






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






14. Covalent bonding of the polymer backbone and side groups






15. 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






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






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






18. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly






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






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






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






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






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






24. 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






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






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






27. Porcess of breaking large organic hydrocarbons into smaller molecules






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






29. 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






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






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






32. Low- molecular- weight building blocks repeated in the polymer chain






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






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






35. Number of bonds a molecule has formed






36. 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






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






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






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






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






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






42. Molecule containing a highly reactive unpaired electron






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






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






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






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






47. 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






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






49. 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






50. 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