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






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






3. Covalent bonding of the polymer backbone and side groups






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






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






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






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






8. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination






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






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






11. 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






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






13. 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






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






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






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






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






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






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






20. 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






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






22. Primary raw material for most polymers






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






24. 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






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






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






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






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






29. Coloring agents that do not dissolve into the polymer






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






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






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






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






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






35. An acid and an alcohol






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






37. Atoms attached to the polymer backbone.






38. 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






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






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






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






42. Molecule containing a highly reactive unpaired electron






43. 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






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






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






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






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






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






49. 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






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