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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 monomers - which attach to the polymer chain in no particular order of pattern






2. 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






3. Coloring agents that do not dissolve into the polymer






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






5. 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






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






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






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






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






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






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






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






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






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






15. Formation of side chains along the backbone; presence of branches disrupts the interactions beween adjacent chains; lowering the tensile strength - melting point - stiffness - crystallinity - and density






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






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






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






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






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






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






22. 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






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






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






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






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






27. 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






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






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






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






31. 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






32. Covalent bonding of the polymer backbone and side groups






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






34. Number of bonds a molecule has formed






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






36. An acid and an alcohol






37. Softening agents






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






39. Primary raw material for most polymers






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






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






42. 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






43. Relative configuration of adjecent asymmetric carbons






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






45. 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






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






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






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






49. Is not asymetric and cannot have multiple configurations






50. Additives that cause swelling - which allows the polymer chains to slide past one another more easily - making the polymer softer and more pliable. also used to decrease the viscosity of cement paste to make it easier to flow