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






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






3. 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






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






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






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






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






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






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






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






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






12. Is not asymetric and cannot have multiple configurations






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






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






15. Coloring agents that do not dissolve into the polymer






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






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






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






19. 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






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






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






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






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






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






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






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






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






28. 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






29. 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






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






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






32. 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






33. 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






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






35. An acid and an alcohol






36. Simple polymeric material produced as pellets in large quantities






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






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






39. Double bounded organic molecule used to begin addition polymerization






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






41. Atoms attached to the polymer backbone.






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






43. Number of bonds a molecule has formed






44. 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






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






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






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






48. 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






49. 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






50. Molecule containing a highly reactive unpaired electron