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Modern Material Science And Engineering 2

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
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  • 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. 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






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






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






4. 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






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






6. 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






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






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






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






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. 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






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






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






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






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






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






17. Atoms attached to the polymer backbone.






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






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






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






21. Softening agents






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






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






24. Covalent bonding of the polymer backbone and side groups






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






26. Primary raw material for most polymers






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






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






29. Polymer that is made up a single repeat unit






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






31. Number of bonds a molecule has formed






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






33. 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






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






35. 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






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






37. 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






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






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






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






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






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






43. Molecule containing a highly reactive unpaired electron






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






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






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






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






48. Relative configuration of adjecent asymmetric carbons






49. 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






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