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






2. Coloring agents that do not dissolve into the polymer






3. Porcess of breaking large organic hydrocarbons into smaller molecules






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






5. 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






6. 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






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






8. Is not asymetric and cannot have multiple configurations






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






10. 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






11. 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






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






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






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






15. 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






16. 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






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






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






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






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






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






22. 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






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






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






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






26. Atoms attached to the polymer backbone.






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






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






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






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






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






32. Softening agents






33. Number of bonds a molecule has formed






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






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






36. Molecule containing a highly reactive unpaired electron






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






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






39. 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






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






41. 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






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






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






44. 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






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






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






47. 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






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






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






50. 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