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Modern Material Science And Engineering 2

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
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  • 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. 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






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






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






4. Covalent bonding of the polymer backbone and side groups






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






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






7. 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






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






9. 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






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






11. Coloring agents that do not dissolve into the polymer






12. 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






13. Molecule containing a highly reactive unpaired electron






14. Polymer that is made up a single repeat unit






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






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






17. 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






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






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






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






21. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets






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






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






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






25. 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






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






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






28. Relative configuration of adjecent asymmetric carbons






29. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds






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






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






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






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






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. 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






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






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






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






39. 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






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






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






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






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






44. Atoms attached to the polymer backbone.






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






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






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






48. 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






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






50. 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