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






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






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






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






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






6. 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






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






8. 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






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






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






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






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






13. 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






14. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly






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






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






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






18. Relative configuration of adjecent asymmetric carbons






19. 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






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






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






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






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






24. Is not asymetric and cannot have multiple configurations






25. Covalent bonding of the polymer backbone and side groups






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






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






29. Polymer that is made up a single repeat unit






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






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






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






33. 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






34. Softening agents






35. 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






36. 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






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






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






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






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






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






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






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






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






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






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






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






48. Coloring agents that do not dissolve into the polymer






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






50. 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