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






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






3. 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






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






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






6. 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






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






8. Atoms attached to the polymer backbone.






9. Number of bonds a molecule has formed






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






11. Coloring agents that do not dissolve into the polymer






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






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






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






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






16. 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






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






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






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






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






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






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






23. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






26. 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






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






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






29. Softening agents






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






32. An acid and an alcohol






33. 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






34. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber






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






36. 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






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






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






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






40. 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






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






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






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






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






45. Low- molecular- weight building blocks repeated in the polymer chain






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






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






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






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






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