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






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






3. 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






4. 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






5. Coloring agents that do not dissolve into the polymer






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






7. An acid and an alcohol






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






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






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






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






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






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






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






15. 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






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






17. Softening agents






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






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






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






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






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






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






24. Polymer that is made up a single repeat unit






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. Is not asymetric and cannot have multiple configurations






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






28. Covalent bonding of the polymer backbone and side groups






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






30. 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






31. Atoms attached to the polymer backbone.






32. Primary raw material for most polymers






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






34. 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






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






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






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






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






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






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






41. 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






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






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






44. 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






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






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






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






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






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






50. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer