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






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






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






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






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






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






7. Simple polymeric material produced as pellets in large quantities






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






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






10. Polymer that is made up a single repeat unit






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






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






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. Polymers comprised of two or more different monomers that attach to the chain in long runs of one type of monomer - followed by another monomer AAAAAAAAAAAAABBBBBBBBBBBBBBBBBBAAAAAAAA






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






16. 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






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






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






19. Covalent bonding of the polymer backbone and side groups






20. Double bounded organic molecule used to begin addition polymerization






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






22. 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






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






24. 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






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






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






27. 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






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






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






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






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






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






33. Softening agents






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






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






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. Atoms attached to the polymer backbone.






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






39. 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






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






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






42. Number of bonds a molecule has formed






43. 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






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






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






46. 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






47. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups






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






49. 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






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