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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. Molecule containing a highly reactive unpaired electron






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






3. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






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






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






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






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






12. Primary raw material for most polymers






13. An acid and an alcohol






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






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






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






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. Covalent bonding of the polymer backbone and side groups






19. Number of bonds a molecule has formed






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






21. Coloring agents that do not dissolve into the polymer






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






23. Atoms attached to the polymer backbone.






24. 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






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






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






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






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






29. Relative configuration of adjecent asymmetric carbons






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. 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






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






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






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






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






36. Polymer that is made up a single repeat unit






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






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






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






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






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






42. Second- order thermodynamic transition in which the onset of large scale chain mobility occures in polymers. Bellow Tg the polymer is glasslike and brittle. above Tg the polymer becomes rubbery and flexible






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






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






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






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






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






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






49. 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






50. 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