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






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






3. 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






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






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






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






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






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






9. 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






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






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






12. 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






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






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






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






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






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






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






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






20. 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






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






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






23. An acid and an alcohol






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






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






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






27. Polymer that is made up a single repeat unit






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






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






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. 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






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






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






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






35. Primary raw material for most polymers






36. Is not asymetric and cannot have multiple configurations






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






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






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






40. 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






41. 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






42. Double bounded organic molecule used to begin addition polymerization






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






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






45. Atoms attached to the polymer backbone.






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






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






48. Simple polymeric material produced as pellets in large quantities






49. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit






50. Relative configuration of adjecent asymmetric carbons