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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. An acid and an alcohol






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






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






4. 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






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






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






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






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






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






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






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






12. Softening agents






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






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






15. Polymer that is made up a single repeat unit






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






17. 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






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






19. Molecule containing a highly reactive unpaired electron






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






21. Covalent bonding of the polymer backbone and side groups






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






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






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






25. Is not asymetric and cannot have multiple configurations






26. 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






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






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






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






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






31. 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






32. Double bounded organic molecule used to begin addition polymerization






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






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






35. 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






36. Porcess of breaking large organic hydrocarbons into smaller molecules






37. 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






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






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






40. 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






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






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






44. 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






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






46. 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






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






48. 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






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






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






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