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






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






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






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






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






6. 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






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






8. 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






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






10. Covalent bonding of the polymer backbone and side groups






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






12. 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






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






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






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






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






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






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






19. Is not asymetric and cannot have multiple configurations






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






21. Relative configuration of adjecent asymmetric carbons






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






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






24. 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






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






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






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






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






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






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






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






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






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






34. 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






35. 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






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






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






38. Molecule containing a highly reactive unpaired electron






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






40. 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






41. Number of bonds a molecule has formed






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






43. 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






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






45. 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






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






47. An acid and an alcohol






48. Porcess of breaking large organic hydrocarbons into smaller molecules






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






50. Coloring agents that do not dissolve into the polymer