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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. Atoms attached to the polymer backbone.






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






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






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






6. 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






7. Double bounded organic molecule used to begin addition polymerization






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






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






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






11. Primary raw material for most polymers






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






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






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






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






16. 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






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






18. 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






19. 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






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






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






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






23. Number of bonds a molecule has formed






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






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. Simple polymeric material produced as pellets in large quantities






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






28. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains






29. Polymer that is made up a single repeat unit






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






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






32. 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






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






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






35. 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






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






37. 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






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






39. Is not asymetric and cannot have multiple configurations






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






41. Softening agents






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






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






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






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






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






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






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






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






50. 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