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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. 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






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






3. 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






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






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






6. Double bounded organic molecule used to begin addition polymerization






7. Primary raw material for most polymers






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






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






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






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






12. 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






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






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






15. Atoms attached to the polymer backbone.






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






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






18. Coloring agents that do not dissolve into the polymer






19. An acid and an alcohol






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






21. Polymer that is made up a single repeat unit






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






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






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






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






26. Molecule containing a highly reactive unpaired electron






27. 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






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






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






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






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






32. Formation of side chains along the backbone; presence of branches disrupts the interactions beween adjacent chains; lowering the tensile strength - melting point - stiffness - crystallinity - and density






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






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






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






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






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






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






39. Porcess of breaking large organic hydrocarbons into smaller molecules






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






41. Is not asymetric and cannot have multiple configurations






42. Number of bonds a molecule has formed






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






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






45. Covalent bonding of the polymer backbone and side groups






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






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






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






49. 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






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