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






2. Configuration of a substituent in a polymer - in which the substituent is located on the same side of the polymer chain in all repeating units






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






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






5. 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






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






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






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






9. 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






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






11. 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






12. 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






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






14. Covalent bonding of the polymer backbone and side groups






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






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






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






18. Coloring agents that do not dissolve into the polymer






19. 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






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






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






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






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. An acid and an alcohol






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






27. Number of bonds a molecule has formed






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






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






30. 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






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






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






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






35. 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






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






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






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






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






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






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






42. 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






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






44. 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






45. Relative configuration of adjecent asymmetric carbons






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






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






48. Primary raw material for most polymers






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






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