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






2. 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






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






4. 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






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






6. 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






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






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






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






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






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






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






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






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






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






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






17. 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






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






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






20. Double bounded organic molecule used to begin addition polymerization






21. Simple polymeric material produced as pellets in large quantities






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






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






24. An acid and an alcohol






25. Is not asymetric and cannot have multiple configurations






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






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






28. 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






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






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






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






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






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






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






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






36. 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






37. 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






38. Covalent bonding of the polymer backbone and side groups






39. Relative configuration of adjecent asymmetric carbons






40. 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






41. Polymer that is made up a single repeat unit






42. 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






43. Coloring agents that do not dissolve into the polymer






44. Molecule containing a highly reactive unpaired electron






45. Primary raw material for most polymers






46. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel






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






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






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






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