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






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






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






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






5. Double bounded organic molecule used to begin addition polymerization






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






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






8. Polymer that is made up a single repeat unit






9. 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






10. Simple polymeric material produced as pellets in large quantities






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






12. 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






13. Atoms attached to the polymer backbone.






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






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






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






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






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






19. Relative configuration of adjecent asymmetric carbons






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






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






22. Molecule containing a highly reactive unpaired electron






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






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






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






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






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






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






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






30. Primary raw material for most polymers






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






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






33. 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






34. Softening agents






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






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






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






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






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






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






41. 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






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






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






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






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






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






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






48. 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






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






50. Coloring agents that do not dissolve into the polymer






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