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






2. 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






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






4. Covalent bonding of the polymer backbone and side groups






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






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






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






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






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






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






12. Number of bonds a molecule has formed






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






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






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






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






17. 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






18. Softening agents






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






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






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






22. 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






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






24. Double bounded organic molecule used to begin addition polymerization






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






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






27. Primary raw material for most polymers






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






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






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






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






32. 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






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






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






35. 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






36. 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






37. Coloring agents that do not dissolve into the polymer






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






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






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






41. 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






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






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






44. 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






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






46. Is not asymetric and cannot have multiple configurations






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






48. Simple polymeric material produced as pellets in large quantities






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






50. 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