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Modern Material Science And Engineering 2

Subject : engineering
Instructions:
  • Answer 50 questions in 20 minutes. 2 minutes extra for reading the instructions.
  • 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 polyamide in which less that 85% of the amide groups are bonded to the aromatic rings






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






3. Simple polymeric material produced as pellets in large quantities






4. 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






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






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






7. 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






8. 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






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






10. Softening agents






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






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






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






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






15. Covalent bonding of the polymer backbone and side groups






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






17. 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






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






19. 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






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






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






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






23. Number of bonds a molecule has formed






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






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






26. 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






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






28. 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






29. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets






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






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






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






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






34. Is not asymetric and cannot have multiple configurations






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






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






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






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






40. Polymer that is made up a single repeat unit






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






42. Atoms attached to the polymer backbone.






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






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






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






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






47. 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






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






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






50. Relative configuration of adjecent asymmetric carbons