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






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






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






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






5. 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






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. 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






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






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






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






11. Simple polymeric material produced as pellets in large quantities






12. 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






13. 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






14. 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






15. 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






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






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






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






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






20. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property






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






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






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






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






25. Covalent bonding of the polymer backbone and side groups






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






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






28. 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






29. 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






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






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






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






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






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






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






37. 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






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






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






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






41. An acid and an alcohol






42. 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






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






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






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






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






47. Softening agents






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






49. Double bounded organic molecule used to begin addition polymerization






50. Coloring agents that do not dissolve into the polymer