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






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






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






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






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






7. Number of bonds a molecule has formed






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






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






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






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






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






14. 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






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






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






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






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






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






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






21. 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






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






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






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






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






26. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






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






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






33. 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






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






35. Atoms attached to the polymer backbone.






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






37. 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






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






39. Double bounded organic molecule used to begin addition polymerization






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






41. Molecule containing a highly reactive unpaired electron






42. Coloring agents that do not dissolve into the polymer






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






44. 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






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






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






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






48. 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






49. Relative configuration of adjecent asymmetric carbons






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