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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. Atoms attached to the polymer backbone.






2. Double bounded organic molecule used to begin addition polymerization






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






4. An acid and an alcohol






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






6. Polymer that is made up a single repeat unit






7. Number of bonds a molecule has formed






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






9. 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






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






11. 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






12. 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






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






14. Formation of a polymer that occurs when two potentially reactive end groups on a polymer react to form a new covalent bond between the polymer chain. this reaction also forms a byproduct - which is typically water






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






16. 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






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






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






19. Is not asymetric and cannot have multiple configurations






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






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






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






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






24. Softening agents






25. Primary raw material for most polymers






26. 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






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






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






29. 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






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






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






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






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






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






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






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






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






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






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






40. Simple polymeric material produced as pellets in large quantities






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






42. Covalent bonding of the polymer backbone and side groups






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






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






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






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. Conformation in which the largest substituents are offset by 180






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






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






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