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






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






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






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






5. 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






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






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






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






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






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






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






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






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






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






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






18. Softening agents






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






20. Number of bonds a molecule has formed






21. 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






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






23. 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






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






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






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






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






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






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






30. 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






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






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






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






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






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






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






37. 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






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






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






40. Covalent bonding of the polymer backbone and side groups






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






42. Double bounded organic molecule used to begin addition polymerization






43. Primary raw material for most polymers






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






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






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






47. 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






48. Is not asymetric and cannot have multiple configurations






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






50. 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