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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. Number of repeat/structural units in a polymer chain






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






3. Simple polymeric material produced as pellets in large quantities






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






20. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






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






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






27. Atoms attached to the polymer backbone.






28. Softening agents






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






30. Relative configuration of adjecent asymmetric carbons






31. 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






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






33. Molecule containing a highly reactive unpaired electron






34. Double bounded organic molecule used to begin addition polymerization






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






36. 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






37. Coloring agents that do not dissolve into the polymer






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






39. 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






40. 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






41. Primary raw material for most polymers






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






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






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






45. Is not asymetric and cannot have multiple configurations






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






47. 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






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. 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






50. 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