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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. 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






2. Atoms attached to the polymer backbone.






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






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






5. Polymer that is made up a single repeat unit






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






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






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






9. 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






10. 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






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






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






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






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






15. Simple polymeric material produced as pellets in large quantities






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






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






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






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






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






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






23. 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






24. 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






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






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






27. 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






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






29. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups






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






31. 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






32. Softening agents






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






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






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






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






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






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






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






41. 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






42. 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






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






44. Molecule containing a highly reactive unpaired electron






45. Number of bonds a molecule has formed






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






47. Covalent bonding of the polymer backbone and side groups






48. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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