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






2. Coloring agents that do not dissolve into the polymer






3. 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






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






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






6. An acid and an alcohol






7. 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






8. Primary raw material for most polymers






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






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






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






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






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






14. 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






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






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






17. 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






18. 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






19. 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






20. Porcess of breaking large organic hydrocarbons into smaller molecules






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






22. Simple polymeric material produced as pellets in large quantities






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






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






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






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






27. Covalent bonding of the polymer backbone and side groups






28. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






33. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings






34. Additives whose primary purpose is to reduce the final cost of the product






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






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






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






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






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






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






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






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






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






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






45. Relative configuration of adjecent asymmetric carbons






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






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






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






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






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