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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. Coloring agents that do not dissolve into the polymer






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






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






4. 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






5. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light






6. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed






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






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






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






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






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






12. Is not asymetric and cannot have multiple configurations






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






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






15. 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






16. Softening agents






17. 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






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






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






20. 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






21. 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






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






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






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






25. Simple polymeric material produced as pellets in large quantities






26. Relative configuration of adjecent asymmetric carbons






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






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






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






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






31. Primary raw material for most polymers






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






33. Double bounded organic molecule used to begin addition polymerization






34. An acid and an alcohol






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






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






37. 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






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






39. Number of bonds a molecule has formed






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






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






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






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






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






45. 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






46. Polymer that is made up a single repeat unit






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






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






49. Porcess of breaking large organic hydrocarbons into smaller molecules






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