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






2. Polymer that is made up a single repeat unit






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






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






5. 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






6. 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






7. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets






8. Relative configuration of adjecent asymmetric carbons






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






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






11. An acid and an alcohol






12. 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






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






14. 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






15. 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






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






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






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






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






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






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






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






23. 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






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






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






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






27. Is not asymetric and cannot have multiple configurations






28. 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






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






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






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






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






33. 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






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






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






36. 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






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






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






39. 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






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






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






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






43. 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






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






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






46. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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