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






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






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






4. 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






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






6. Covalent bonding of the polymer backbone and side groups






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






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






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






10. 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






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






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






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






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






15. Molecule containing a highly reactive unpaired electron






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






17. 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






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






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






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






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






22. Primary raw material for most polymers






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






24. Polymer that is made up a single repeat unit






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






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






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






28. 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






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






30. Atoms attached to the polymer backbone.






31. 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






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






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






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






35. Softening agents






36. Number of bonds a molecule has formed






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






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






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






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






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






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






43. 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






44. Is not asymetric and cannot have multiple configurations






45. An acid and an alcohol






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






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






48. 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






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






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