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






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






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






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






5. 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






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






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






8. 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






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






10. 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






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






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






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. 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






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






16. 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






17. Double bounded organic molecule used to begin addition polymerization






18. Softening agents






19. Primary raw material for most polymers






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






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






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






23. Number of bonds a molecule has formed






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






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






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






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






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






29. Atoms attached to the polymer backbone.






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






31. 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






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






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






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






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






36. 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






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






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






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






40. Simple polymeric material produced as pellets in large quantities






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






42. Form of the molecular weight of a sample of polymer chains determined by dividing the mass of the specimen by total number of mols present; always less than weight average molecular weight; all molecules regardless of size correlate well with Mn






43. 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






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






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






46. Covalent bonding of the polymer backbone and side groups






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






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






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






50. Relative configuration of adjecent asymmetric carbons