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






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






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






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






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






6. 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






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






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






9. 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






10. Molecule containing a highly reactive unpaired electron






11. Softening agents






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






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






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






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






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






17. 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






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






19. 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






20. Double bounded organic molecule used to begin addition polymerization






21. Porcess of breaking large organic hydrocarbons into smaller molecules






22. Primary raw material for most polymers






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






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






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






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






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






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






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






30. Is not asymetric and cannot have multiple configurations






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






32. An acid and an alcohol






33. Coloring agents that do not dissolve into the polymer






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






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






38. Number of bonds a molecule has formed






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






40. 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






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






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






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






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






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






46. 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






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






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






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






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