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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. 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






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






3. 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






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






6. Atoms attached to the polymer backbone.






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






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






9. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






13. 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






14. 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






15. Number of bonds a molecule has formed






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






17. 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






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






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






20. 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






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






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






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






25. Polymer that is made up a single repeat unit






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






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






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






29. Conformation in which the largest substituents are offset by 180






30. 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






31. Covalent bonding of the polymer backbone and side groups






32. Primary raw material for most polymers






33. 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






34. Simple polymeric material produced as pellets in large quantities






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






36. 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






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






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






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






40. Double bounded organic molecule used to begin addition polymerization






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






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






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






44. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret






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






46. Is not asymetric and cannot have multiple configurations






47. 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






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






49. 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






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






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