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






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






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






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






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






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






8. 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






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






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






11. 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






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






13. 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






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






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






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






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






18. 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






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






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






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






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






23. 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






24. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer






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






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






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






28. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit






29. Coloring agents that do not dissolve into the polymer






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






31. Softening agents






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






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






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






35. 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






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






37. 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






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






39. Covalent bonding of the polymer backbone and side groups






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






41. Relative configuration of adjecent asymmetric carbons






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






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






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






45. 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






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






47. 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






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






49. 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






50. Number of bonds a molecule has formed