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






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






3. 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






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






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






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






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






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






9. Polymer that is made up a single repeat unit






10. Relative configuration of adjecent asymmetric carbons






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






12. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit






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






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. 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






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






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






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






19. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






22. Coloring agents that do not dissolve into the polymer






23. Atoms attached to the polymer backbone.






24. Softening agents






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






26. Number of bonds a molecule has formed






27. 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






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






29. 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






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






31. Covalent bonding of the polymer backbone and side groups






32. 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






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






35. An acid and an alcohol






36. 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






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






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






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






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






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






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






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






44. 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






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






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






47. 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






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






49. Is not asymetric and cannot have multiple configurations






50. 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