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






2. 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






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






4. 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






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. Molecule containing a highly reactive unpaired electron






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






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






9. 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






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






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






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






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






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






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






16. Polymer that is made up a single repeat unit






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






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






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






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






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






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






23. Primary raw material for most polymers






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






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






26. Simple polymeric material produced as pellets in large quantities






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






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






29. 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






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






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






32. 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






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






34. 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






35. 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






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






37. Is not asymetric and cannot have multiple configurations






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






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






40. Coloring agents that do not dissolve into the polymer






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






42. Atoms attached to the polymer backbone.






43. 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






44. 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






45. Covalent bonding of the polymer backbone and side groups






46. 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






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






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






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






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