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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. 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






2. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance






3. 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






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






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






6. 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






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






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






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






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






11. 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






12. Coloring agents that do not dissolve into the polymer






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






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






15. 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






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






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






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






19. Covalent bonding of the polymer backbone and side groups






20. Atoms attached to the polymer backbone.






21. An acid and an alcohol






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






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






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






25. Primary raw material for most polymers






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






27. Number of bonds a molecule has formed






28. 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






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






30. 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






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






32. Molecule containing a highly reactive unpaired electron






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






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






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






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






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






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






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






40. Softening agents






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






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






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






44. 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






45. 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






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. Polymer that is made up a single repeat unit






48. Porcess of breaking large organic hydrocarbons into smaller molecules






49. Double bounded organic molecule used to begin addition polymerization






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






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