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Test your basic knowledge |

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. Polymer that is made up a single repeat unit






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






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






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






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






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






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






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






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






10. Coloring agents that do not dissolve into the polymer






11. 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






12. 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






13. Porcess of breaking large organic hydrocarbons into smaller molecules






14. Covalent bonding of the polymer backbone and side groups






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






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






17. 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






18. Number of bonds a molecule has formed






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






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






21. 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






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






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






24. 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






25. An acid and an alcohol






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






27. 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






28. Simple polymeric material produced as pellets in large quantities






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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