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






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






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






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






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






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






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






8. Softening agents






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






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






11. 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






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






13. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






17. 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






18. 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






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






20. Relative configuration of adjecent asymmetric carbons






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






22. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.






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






24. Is not asymetric and cannot have multiple configurations






25. 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






26. Primary raw material for most polymers






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






29. Coloring agents that do not dissolve into the polymer






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






31. Part of the extrusion apparatus that contains a heated screw which is used to melt the polymer and the polymer forward into the next chamber






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






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






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






35. Double bounded organic molecule used to begin addition polymerization






36. 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






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






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






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






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






42. Number of bonds a molecule has formed






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






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






45. An acid and an alcohol






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






47. 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






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






49. Simple polymeric material produced as pellets in large quantities






50. Atoms attached to the polymer backbone.