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






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






4. 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






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






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






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






8. Coloring agents that do not dissolve into the polymer






9. 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






10. 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






11. 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






12. 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






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






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






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






17. Covalent bonding of the polymer backbone and side groups






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






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






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






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






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






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






24. 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






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






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






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






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






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






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






31. 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






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






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






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






35. Double bounded organic molecule used to begin addition polymerization






36. Simple polymeric material produced as pellets in large quantities






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






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






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






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






41. Softening agents






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






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






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






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






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






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






48. 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






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






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