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






2. 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






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






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






5. 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






6. Relative configuration of adjecent asymmetric carbons






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






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






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






10. Coloring agents that do not dissolve into the polymer






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






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






13. Formation of side chains along the backbone; presence of branches disrupts the interactions beween adjacent chains; lowering the tensile strength - melting point - stiffness - crystallinity - and density






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






15. Atoms attached to the polymer backbone.






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






17. Is not asymetric and cannot have multiple configurations






18. 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






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






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






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






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






23. Double bounded organic molecule used to begin addition polymerization






24. 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






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






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






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






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






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






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






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






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






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






35. 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






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






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






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






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






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






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






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






43. Polymer that is made up a single repeat unit






44. 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






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






46. Number of bonds a molecule has formed






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






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






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






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