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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. Polymer that is made up a single repeat unit






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






3. Number of bonds a molecule has formed






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






5. 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






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






7. An acid and an alcohol






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






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






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






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






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






13. Softening agents






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






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






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






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






18. Atoms attached to the polymer backbone.






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






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






21. Molecule containing a highly reactive unpaired electron






22. 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






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






24. Primary raw material for most polymers






25. 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






26. First step in the process of polymerization - during which a free radical is formed






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






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






29. Is not asymetric and cannot have multiple configurations






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






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






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






33. Coloring agents that do not dissolve into the polymer






34. Number of repeat/structural units in a 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. Relative configuration of adjecent asymmetric carbons






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






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






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






40. 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






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






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






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. 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






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






46. 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






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






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






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






50. Covalent bonding of the polymer backbone and side groups