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






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






3. 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






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






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






6. 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






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






8. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.






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






10. Simple polymeric material produced as pellets in large quantities






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






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. Relative configuration of adjecent asymmetric carbons






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






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






16. 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






17. 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






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






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






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






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






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






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






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






25. 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






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






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






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






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






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






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






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






33. 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






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






35. 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






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






37. 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






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






39. 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






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






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






42. 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






43. Polymer that is made up a single repeat unit






44. Is not asymetric and cannot have multiple configurations






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






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






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






48. 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






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






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