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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. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






5. Softening agents






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






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






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






9. Polymer that is made up a single repeat unit






10. 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






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






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






13. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret






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






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






16. 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






17. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group






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






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






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






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






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






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






24. Molecule containing a highly reactive unpaired electron






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






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






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






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






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






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






31. Relative configuration of adjecent asymmetric carbons






32. 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






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






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






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






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






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






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






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






40. 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






41. Process used to make thermoset fibers by performing the polymerization reacting in a solbent as the material flows through a spinneret and into a quenching bath






42. 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






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






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






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






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






47. Specific arrangements of atoms that cause organic compounds to behave in predictable ways






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






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






50. Double bounded organic molecule used to begin addition polymerization