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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. 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






2. Polymer that is made up a single repeat unit






3. Softening agents






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






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






6. 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






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






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






9. 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






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






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






12. Atoms attached to the polymer backbone.






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






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






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






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






17. Coloring agents that do not dissolve into the polymer






18. Conformation that occurs when the largest substituent in a molecule are offset by 60






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






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






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






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






23. 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






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






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






26. Porcess of breaking large organic hydrocarbons into smaller molecules






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






28. An acid and an alcohol






29. 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






30. 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






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






32. 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






33. Relative configuration of adjecent asymmetric carbons






34. Simple polymeric material produced as pellets in large quantities






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






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






37. Covalent bonding of the polymer backbone and side groups






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






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






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






41. Molecule containing a highly reactive unpaired electron






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






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






44. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






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






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