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






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. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air






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






5. 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






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






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






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






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






10. Porcess of breaking large organic hydrocarbons into smaller molecules






11. Is not asymetric and cannot have multiple configurations






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






13. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret






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






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






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






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






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






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






20. 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






21. Number of bonds a molecule has formed






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






23. 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






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






25. 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






26. 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






27. 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






28. Simple polymeric material produced as pellets in large quantities






29. 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






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






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






32. Atoms attached to the polymer backbone.






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






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






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






36. Softening agents






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






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






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






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






41. 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






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






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






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






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






46. Primary raw material for most polymers






47. Relative configuration of adjecent asymmetric carbons






48. Coloring agents that do not dissolve into the polymer






49. Covalent bonding of the polymer backbone and side groups






50. 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