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






2. Polymer that is made up a single repeat unit






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






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






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






6. Term used to represent the average molecular weight of a sample containing a wide range of polymer chain lengths. this term is used to avoid confusion between the number average and the weight molecular average weight






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






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






9. Number of bonds a molecule has formed






10. Broad category of polymers that includes polymers containing urethane linkages






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






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






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






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






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






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






17. Covalent bonding of the polymer backbone and side groups






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






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






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






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






22. Simple polymeric material produced as pellets in large quantities






23. Primary raw material for most polymers






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






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






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






27. 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






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






29. 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






30. 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






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






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






33. 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






34. Is not asymetric and cannot have multiple configurations






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






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






37. Additives whose primary purpose is to reduce the final cost of the product






38. 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






39. Atoms attached to the polymer backbone.






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






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






42. 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






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






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






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






46. Molecule containing a highly reactive unpaired electron






47. 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






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






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






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