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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. 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






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






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






4. Molecule containing a highly reactive unpaired electron






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






6. Primary raw material for most polymers






7. 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






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






9. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings






10. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed






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






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






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






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






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






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






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






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






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






20. 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






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






22. 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






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






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






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






26. Number of bonds a molecule has formed






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






28. An acid and an alcohol






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






30. Double bounded organic molecule used to begin addition polymerization






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






32. 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






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






34. Coloring agents that do not dissolve into the polymer






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






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






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






38. 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






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






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






41. Relative configuration of adjecent asymmetric carbons






42. 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






43. 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






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






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






46. Porcess of breaking large organic hydrocarbons into smaller molecules






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






48. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device






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






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