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






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






3. Number of bonds a molecule has formed






4. Molecule containing a highly reactive unpaired electron






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






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






7. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






11. 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






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






13. Covalently bonded chains of molecules with small monomer units repeated from end to end






14. Atoms attached to the polymer backbone.






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






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






17. Covalent bonding of the polymer backbone and side groups






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






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






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






22. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties






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






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






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






26. 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






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






28. 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






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






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






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






32. Polymer that is made up a single repeat unit






33. Coloring agents that do not dissolve into the polymer






34. Double bounded organic molecule used to begin addition polymerization






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






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






37. Is not asymetric and cannot have multiple configurations






38. Simple polymeric material produced as pellets in large quantities






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






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






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






42. 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






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






44. 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






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






46. 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






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






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






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






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