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






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






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






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






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






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






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






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






9. 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






10. 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






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






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






13. 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






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






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






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






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






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






19. 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






20. An acid and an alcohol






21. Simple polymeric material produced as pellets in large quantities






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






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






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






25. 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






26. Number of bonds a molecule has formed






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






28. Double bounded organic molecule used to begin addition polymerization






29. Covalent bonding of the polymer backbone and side groups






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






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






32. Softening agents






33. 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






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






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






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






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






38. 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






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






40. Is not asymetric and cannot have multiple configurations






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






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






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






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






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






46. 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






47. Molecule containing a highly reactive unpaired electron






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






49. Porcess of breaking large organic hydrocarbons into smaller molecules






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