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






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






4. 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






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






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






7. 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






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






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






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






11. Is not asymetric and cannot have multiple configurations






12. Atoms attached to the polymer backbone.






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






14. Double bounded organic molecule used to begin addition polymerization






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






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






17. Porcess of breaking large organic hydrocarbons into smaller molecules






18. Simple polymeric material produced as pellets in large quantities






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






20. 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






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






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






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






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






25. Covalent bonding of the polymer backbone and side groups






26. 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






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






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






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






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






31. 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






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






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






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






35. Polymer that is made up a single repeat unit






36. 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






37. 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






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






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






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






41. 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






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






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






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






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






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






47. 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






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






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






50. 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