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






2. Coloring agents that do not dissolve into the polymer






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






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






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. Broad category of polymers that includes polymers containing urethane linkages






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. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups






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






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






11. Covalent bonding of the polymer backbone and side groups






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






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






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






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






16. Primary raw material for most polymers






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






18. Atoms attached to the polymer backbone.






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






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






21. 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






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






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






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






25. Relative configuration of adjecent asymmetric carbons






26. Is not asymetric and cannot have multiple configurations






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






28. 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






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






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






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






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






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






34. Formation of side chains along the backbone; presence of branches disrupts the interactions beween adjacent chains; lowering the tensile strength - melting point - stiffness - crystallinity - and density






35. 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






36. Double bounded organic molecule used to begin addition polymerization






37. Number of bonds a molecule has formed






38. 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






39. 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






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






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






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






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






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






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






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






47. 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






48. 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






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






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