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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. Polymer that is made up a single repeat unit






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






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






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






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






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






8. 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






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






10. 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






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






12. 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






13. 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






14. Is not asymetric and cannot have multiple configurations






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






16. 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






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






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






19. 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






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






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






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






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






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






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






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






27. 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






28. Number of bonds a molecule has formed






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






30. 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






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






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






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






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






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






36. 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






37. 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






38. Atoms attached to the polymer backbone.






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






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






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






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






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






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






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






46. Relative configuration of adjecent asymmetric carbons






47. 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






48. Coloring agents that do not dissolve into the polymer






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






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