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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. Number of bonds a molecule has formed






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






3. 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






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






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






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






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






8. 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






9. 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






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






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






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






13. Porcess of breaking large organic hydrocarbons into smaller molecules






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






15. 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






16. 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






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






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






19. Atoms attached to the polymer backbone.






20. Softening agents






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






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






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






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






25. Is not asymetric and cannot have multiple configurations






26. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability






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






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






29. Coloring agents that do not dissolve into the polymer






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






31. 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






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






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






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






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






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






37. Covalent bonding of the polymer backbone and side groups






38. Relative configuration of adjecent asymmetric carbons






39. An acid and an alcohol






40. Molecule containing a highly reactive unpaired electron






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






42. 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






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






44. 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






45. Primary raw material for most polymers






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






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






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






49. Simple polymeric material produced as pellets in large quantities






50. 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