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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. Number of bonds a molecule has formed






2. Atoms attached to the polymer backbone.






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






4. 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






5. 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






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






7. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group






8. Simple polymeric material produced as pellets in large quantities






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






10. Coloring agents that do not dissolve into the polymer






11. 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






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






13. Softening agents






14. 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






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






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






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






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






19. 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






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






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






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






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






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. 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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






41. Relative configuration of adjecent asymmetric carbons






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






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






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






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






46. 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






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






48. An acid and an alcohol






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






50. Covalent bonding of the polymer backbone and side groups