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






2. Molecule containing a highly reactive unpaired electron






3. 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






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






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






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






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






8. 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






9. Smallest repeating unit in a polymer. aka repeat unit






10. Primary raw material for most polymers






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






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






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






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






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






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






17. Relative configuration of adjecent asymmetric carbons






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






19. 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






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






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






22. Coloring agents that do not dissolve into the polymer






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






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






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






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






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






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






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






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






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






32. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end






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






34. 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






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






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






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






39. 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






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






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






42. 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






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






44. 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






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






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






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






48. Polymer that is made up a single repeat unit






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






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