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






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






3. Molecule containing a highly reactive unpaired electron






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






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






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






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






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






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






10. Covalent bonding of the polymer backbone and side groups






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






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






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






14. 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






15. Smallest repeating unit in a polymer. aka repeat unit






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






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






18. 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






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






20. 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






21. Simple polymeric material produced as pellets in large quantities






22. 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






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






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






25. Relative configuration of adjecent asymmetric carbons






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






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






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






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






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






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






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






33. Primary raw material for most polymers






34. 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






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






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






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






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






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






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






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






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






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






45. 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






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






47. 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






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






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






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