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






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






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






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






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






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. Covalent bonding of the polymer backbone and side groups






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






9. Molecule containing a highly reactive unpaired electron






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






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






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






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






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






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






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






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






19. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups






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






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






22. 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






23. 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






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






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






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






27. 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






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






29. Is not asymetric and cannot have multiple configurations






30. 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






31. 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






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






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






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






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






36. Softening agents






37. 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






38. 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






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






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






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






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






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






44. 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






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






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






47. 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






48. Double bounded organic molecule used to begin addition polymerization






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






50. Polymer that is made up a single repeat unit