Test your basic knowledge |

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






2. 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






3. An acid and an alcohol






4. 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






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






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






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






8. 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






9. Additives that cause swelling - which allows the polymer chains to slide past one another more easily - making the polymer softer and more pliable. also used to decrease the viscosity of cement paste to make it easier to flow






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






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






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






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






14. Atoms attached to the polymer backbone.






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






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






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






18. 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






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






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






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






22. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups






23. Covalent bonding of the polymer backbone and side groups






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






26. Polymer that is made up a single repeat unit






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






28. 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






29. 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






30. Primary raw material for most polymers






31. Relative configuration of adjecent asymmetric carbons






32. 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






33. 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






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






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






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






37. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






42. Coloring agents that do not dissolve into the polymer






43. 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






44. 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






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






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






47. Number of bonds a molecule has formed






48. Molecule containing a highly reactive unpaired electron






49. 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






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