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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. Covalent bonding of the polymer backbone and side groups






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






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






4. Simple polymeric material produced as pellets in large quantities






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






6. 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






7. 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






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






9. 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






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






11. 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






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






13. Polymer that is made up a single repeat unit






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






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






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






17. Atoms attached to the polymer backbone.






18. 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






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






20. 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






21. Primary raw material for most polymers






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






23. Softening agents






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






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






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






27. Part of the extrusion apparatus that contains a heated screw which is used to melt the polymer and the polymer forward into the next chamber






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






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






30. 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






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






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






33. Double bounded organic molecule used to begin addition polymerization






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






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






36. Is not asymetric and cannot have multiple configurations






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






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






39. Number of bonds a molecule has formed






40. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group






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






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






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






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






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






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






47. 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






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






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






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