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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. Broad category of polymers that includes polymers containing urethane linkages






2. Covalent bonding of the polymer backbone and side groups






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






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






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






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






7. Is not asymetric and cannot have multiple configurations






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






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






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






11. 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






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






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






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






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






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






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






18. Coloring agents that do not dissolve into the polymer






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






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






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






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






23. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion






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






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






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






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






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






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






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






31. 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






32. Atoms attached to the polymer backbone.






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






34. An acid and an alcohol






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






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






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






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






39. 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






40. Molecule containing a highly reactive unpaired electron






41. Double bounded organic molecule used to begin addition polymerization






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






43. Porcess of breaking large organic hydrocarbons into smaller molecules






44. 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






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






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






47. 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






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






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






50. Polymer that is made up a single repeat unit