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






2. Polymer that is made up a single repeat unit






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






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






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






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






7. 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






8. Simple polymeric material produced as pellets in large quantities






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






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






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






12. 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






13. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device






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






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






16. Coloring agents that do not dissolve into the polymer






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






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






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






20. 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






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






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






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






24. Number of bonds a molecule has formed






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






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






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






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






29. Is not asymetric and cannot have multiple configurations






30. 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






31. Primary raw material for most polymers






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






33. 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






34. An acid and an alcohol






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






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






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






39. Softening agents






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






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






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






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






44. 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






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






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






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






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






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






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