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Modern Material Science And Engineering 2

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
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  • 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. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air






2. Simple polymeric material produced as pellets in large quantities






3. 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






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






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






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






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






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






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






10. Covalent bonding of the polymer backbone and side groups






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






12. Coloring agents that do not dissolve into the polymer






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






14. Molecule containing a highly reactive unpaired electron






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






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






17. Polymer that is made up a single repeat unit






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






19. 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






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






21. Double bounded organic molecule used to begin addition polymerization






22. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed






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






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






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






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






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






28. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






33. 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






34. 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






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






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






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. Is not asymetric and cannot have multiple configurations






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






40. 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






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






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






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






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






46. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group






47. 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






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






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






50. Number of bonds a molecule has formed