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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. Is not asymetric and cannot have multiple configurations






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






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






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






5. 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






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






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






8. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the 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. Number of repeat/structural units in a polymer chain






11. Process of pushing polymers through a spinneret and winding the solidified fibers onto a tow - which imposes a shear stress on the fibers upstream as they emerge from the spinneret






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






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






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






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






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






17. 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






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






19. Molecule containing a highly reactive unpaired electron






20. 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






21. Softening agents






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






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






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






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






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






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






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






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






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






31. Relative configuration of adjecent asymmetric carbons






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






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






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






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






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






37. 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






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






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






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






41. 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






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






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






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






45. An acid and an alcohol






46. Polymer that is made up a single repeat unit






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






48. Simple polymeric material produced as pellets in large quantities






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






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