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






2. 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






3. Softening agents






4. Polymer that is made up a single repeat unit






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






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






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






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






9. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings






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






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






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






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






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






15. Atoms attached to the polymer backbone.






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






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






18. 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






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






20. Relative configuration of adjecent asymmetric carbons






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






22. 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






23. 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






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






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






26. 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






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






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






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






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






31. Covalent bonding of the polymer backbone and side groups






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






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






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






35. 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






36. 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






37. 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






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






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






40. 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






41. Double bounded organic molecule used to begin addition polymerization






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






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






44. Coloring agents that do not dissolve into the polymer






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






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






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






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






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






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