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






2. Double bounded organic molecule used to begin addition polymerization






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






4. 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






5. Low- molecular- weight building blocks repeated in the polymer chain






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






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






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






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






10. Coloring agents that do not dissolve into the polymer






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






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






13. Softening agents






14. 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






15. An acid and an alcohol






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






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






18. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)






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






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






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






22. 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






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






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






25. Primary raw material for most polymers






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






27. 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






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






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






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






31. Porcess of breaking large organic hydrocarbons into smaller molecules






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






33. 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






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






35. Molecule containing a highly reactive unpaired electron






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






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






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






39. 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






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






41. 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






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






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






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






45. 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






46. Number of bonds a molecule has formed






47. Is not asymetric and cannot have multiple configurations






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






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






50. 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