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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. An acid and an alcohol






2. Double bounded organic molecule used to begin addition polymerization






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






4. Atoms attached to the polymer backbone.






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






6. 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






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






8. 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






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






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






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






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






13. 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






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






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






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






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






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






19. Number of bonds a molecule has formed






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






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






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






23. Polymer made up of two of more differenet monomers covalently bonded together






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






25. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly






26. Form of the molecular weight of a sample of polymer chains determined by dividing the mass of the specimen by total number of mols present; always less than weight average molecular weight; all molecules regardless of size correlate well with Mn






27. Simple polymeric material produced as pellets in large quantities






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






29. 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






30. Softening agents






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






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






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






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






35. Molecule containing a highly reactive unpaired electron






36. 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






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






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






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






40. Primary raw material for most polymers






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






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






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






44. 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






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






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






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






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. 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






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