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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. 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






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






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






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






5. An acid and an alcohol






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






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






8. Primary raw material for most polymers






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






10. 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






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






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






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






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






15. Molecule containing a highly reactive unpaired electron






16. 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






17. 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






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






19. 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






20. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit






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






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






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






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






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






26. 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






27. 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






28. Covalent bonding of the polymer backbone and side groups






29. Is not asymetric and cannot have multiple configurations






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






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






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






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






34. 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






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






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






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






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






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






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






41. 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






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






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






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






45. Atoms attached to the polymer backbone.






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






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






48. 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






49. 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






50. Polymer that is made up a single repeat unit