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






2. 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






3. 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






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






5. Polymers that contain amide (- N-) groups in the chain






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






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






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






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






11. 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






12. 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






13. 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






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






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






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






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






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






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






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






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






22. 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






23. 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






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






25. 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






26. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






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






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






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






34. Coloring agents that do not dissolve into the polymer






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






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






37. Covalent bonding of the polymer backbone and side groups






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






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






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






41. Molecule containing a highly reactive unpaired electron






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






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






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






45. Number of bonds a molecule has formed






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






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






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






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






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