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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. Primary raw material for most polymers






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






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






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






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






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






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






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






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






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






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






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






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






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






17. Atoms attached to the polymer backbone.






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






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






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






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






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






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






24. Relative configuration of adjecent asymmetric carbons






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






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






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






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






29. Part of the extrusion apparatus that contains a heated screw which is used to melt the polymer and the polymer forward into the next chamber






30. Polymers comprised of two or more different monomers that attach to the chain in long runs of one type of monomer - followed by another monomer AAAAAAAAAAAAABBBBBBBBBBBBBBBBBBAAAAAAAA






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






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






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






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






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






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






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






38. Simple polymeric material produced as pellets in large quantities






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






40. 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






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






42. Porcess of breaking large organic hydrocarbons into smaller molecules






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






44. 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






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






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






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






48. 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






49. Polymer that is made up a single repeat unit






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