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






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






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






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






5. 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






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






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






8. Formation of a polymer that occurs when two potentially reactive end groups on a polymer react to form a new covalent bond between the polymer chain. this reaction also forms a byproduct - which is typically water






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






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






11. 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






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






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






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






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






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






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






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






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






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






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






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






23. Covalent bonding of the polymer backbone and side groups






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






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






26. 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






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






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






29. 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






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






31. 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






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






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






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






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






36. Number of bonds a molecule has formed






37. Is not asymetric and cannot have multiple configurations






38. Additives whose primary purpose is to reduce the final cost of the product






39. Coloring agents that do not dissolve into the polymer






40. 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






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






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






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






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






46. 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






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






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






49. Atoms attached to the polymer backbone.






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