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






2. 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






3. Polymer that is made up a single repeat unit






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






5. 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






6. 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






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






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






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






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






11. Number of bonds a molecule has formed






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






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






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






15. 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






16. Relative configuration of adjecent asymmetric carbons






17. 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






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






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






20. 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






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






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






23. 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






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






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






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






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






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






29. 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






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






31. Softening agents






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






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






34. 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






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






36. Long chain polymers that contain at least 85% of an ester of a substituted aromatic carboxylic acid. these fibers are strong and can dyed or made transpared






37. 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






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






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






40. Atoms attached to the polymer backbone.






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






42. Coloring agents that do not dissolve into the polymer






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






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






45. 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






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






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






48. 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






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






50. 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






Can you answer 50 questions in 15 minutes?



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