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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. Number of repeat/structural units in a polymer chain






2. Simple polymeric material produced as pellets in large quantities






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






4. Covalent bonding of the polymer backbone and side groups






5. Double bounded organic molecule used to begin addition polymerization






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






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






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






9. Molecule containing a highly reactive unpaired electron






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






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






12. An acid and an alcohol






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






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






15. 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






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






17. Softening agents






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






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






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






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






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






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






24. Is not asymetric and cannot have multiple configurations






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






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






27. Number of bonds a molecule has formed






28. 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






29. 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






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






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






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






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






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






35. 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






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






37. 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






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






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






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






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. Coloring agents that do not dissolve into the polymer






43. 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






44. 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






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






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






47. Form of the molecular weight of a sample of polymer chains determined by dividing the mass of the specimen by total number of mols present; always less than weight average molecular weight; all molecules regardless of size correlate well with Mn






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






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






50. 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