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






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






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






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






5. 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






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






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






8. Softening agents






9. Molecule containing a highly reactive unpaired electron






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






11. Coloring agents that do not dissolve into the polymer






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






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






14. Covalent bonding of the polymer backbone and side groups






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






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






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






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






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






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






21. 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






22. 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






23. Double bounded organic molecule used to begin addition polymerization






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






25. 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






26. Relative configuration of adjecent asymmetric carbons






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






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






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






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






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






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






33. Number of bonds a molecule has formed






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






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






36. Primary raw material for most polymers






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






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






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






40. Low- molecular- weight building blocks repeated in the polymer chain






41. 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






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






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






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






45. 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






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






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






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






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






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