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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. 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






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






3. Broad category of polymers that includes polymers containing urethane linkages






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






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






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






7. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret






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






9. Polymer that is made up a single repeat unit






10. Double bounded organic molecule used to begin addition polymerization






11. 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






12. 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






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






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






15. 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






16. Atoms attached to the polymer backbone.






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






18. Simple polymeric material produced as pellets in large quantities






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






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






21. Softening agents






22. 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






23. 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






24. 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






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






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






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






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






29. 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






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






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






32. Relative configuration of adjecent asymmetric carbons






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






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






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






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






37. An acid and an alcohol






38. 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






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






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






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






42. Primary raw material for most polymers






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






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






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






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






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






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






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






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






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