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






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






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






4. Simple polymeric material produced as pellets in large quantities






5. Coloring agents that do not dissolve into the polymer






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






7. 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






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






9. 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






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






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






12. Relative configuration of adjecent asymmetric carbons






13. Is not asymetric and cannot have multiple configurations






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






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






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






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






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






19. Molecule containing a highly reactive unpaired electron






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






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






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






23. Porcess of breaking large organic hydrocarbons into smaller molecules






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






25. Configuration of a substituent in a polymer - in which the substituent is located on the same side of the polymer chain in all repeating units






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






27. 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






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






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






31. Double bounded organic molecule used to begin addition polymerization






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






33. 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






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






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






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






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






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






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






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






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






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






44. 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






45. 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






46. Primary raw material for most polymers






47. 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






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






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






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