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






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






3. 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






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






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






6. 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






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






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






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






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






11. 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






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






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






14. 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






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






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






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






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






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






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






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






22. An acid and an alcohol






23. Relative configuration of adjecent asymmetric carbons






24. Low- molecular- weight building blocks repeated in the polymer chain






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






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






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






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






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






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






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






32. Number of bonds a molecule has formed






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






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






35. 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






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






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






38. Primary raw material for most polymers






39. Atoms attached to the polymer backbone.






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






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






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






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






44. Porcess of breaking large organic hydrocarbons into smaller molecules






45. 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






46. Double bounded organic molecule used to begin addition polymerization






47. Softening agents






48. 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






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






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