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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. Softening agents






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






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






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






5. Polymer that is made up a single repeat unit






6. 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






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






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






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






10. 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






11. 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






12. Relative configuration of adjecent asymmetric carbons






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






14. 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






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






16. Atoms attached to the polymer backbone.






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






18. 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






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






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






21. 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






22. 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






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






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






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






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






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






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






29. 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






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






31. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






35. Covalent bonding of the polymer backbone and side groups






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






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






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






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






40. 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






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






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






43. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






48. 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






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






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