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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. Primary raw material for most polymers






2. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly






3. 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






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






5. Coloring agents that do not dissolve into the polymer






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






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






8. 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






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






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






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






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






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






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






15. Softening agents






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






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






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






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






20. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit






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






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






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






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






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






26. 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






27. 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






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






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






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






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






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






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






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






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






36. Polymer that is made up a single repeat unit






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






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






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






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






41. Simple polymeric material produced as pellets in large quantities






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






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






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






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






46. 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






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. 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






49. 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






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