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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. Broad category of polymers that includes polymers containing urethane linkages






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






3. 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






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






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






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






7. Number of bonds a molecule has formed






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






9. 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






10. Porcess of breaking large organic hydrocarbons into smaller molecules






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






12. 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






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






14. Polymer that is made up a single repeat unit






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






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






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






18. Softening agents






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






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






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






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






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






24. Primary raw material for most polymers






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. An acid and an alcohol






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. Conformation in which the largest substituents are offset by 180






29. 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






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






31. 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






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






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






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






35. Is not asymetric and cannot have multiple configurations






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






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






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






39. 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






40. 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






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






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






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






44. 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






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






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






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






48. Atoms attached to the polymer backbone.






49. Relative configuration of adjecent asymmetric carbons






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