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






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






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






4. Atoms attached to the polymer backbone.






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






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






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






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






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






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






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






13. Simple polymeric material produced as pellets in large quantities






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






15. 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






16. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






21. 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






22. 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






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






24. 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






25. Softening agents






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






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. Molecule containing a highly reactive unpaired electron






29. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.






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






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






32. Relative configuration of adjecent asymmetric carbons






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






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






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






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






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






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






40. Coloring agents that do not dissolve into the polymer






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






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






43. Primary raw material for most polymers






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






45. Number of bonds a molecule has formed






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






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






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






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






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