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






2. 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






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






4. Covalent bonding of the polymer backbone and side groups






5. Atoms attached to the polymer backbone.






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






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






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






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






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






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






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






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






14. Primary raw material for most polymers






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






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






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






18. Molecule containing a highly reactive unpaired electron






19. Porcess of breaking large organic hydrocarbons into smaller molecules






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






21. 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






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






23. 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






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






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






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






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






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






29. Double bounded organic molecule used to begin addition polymerization






30. 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






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






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






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






34. 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






35. Number of bonds a molecule has formed






36. 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






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






38. 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






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






40. Coloring agents that do not dissolve into the polymer






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






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






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






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






45. Is not asymetric and cannot have multiple configurations






46. 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






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






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






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






50. 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