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






2. 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






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






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






6. 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






7. 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






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






9. Primary raw material for most polymers






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






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






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






13. 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






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






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






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






17. An acid and an alcohol






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






19. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings






20. 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






21. Softening agents






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






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






24. Double bounded organic molecule used to begin addition polymerization






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






26. Relative configuration of adjecent asymmetric carbons






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






28. Polymer that is made up a single repeat unit






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






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






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






32. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings






33. 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






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






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






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






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






38. Atoms attached to the polymer backbone.






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






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






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






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






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






44. 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






45. 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






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






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






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






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






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







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