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






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






3. Primary raw material for most polymers






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






5. Relative configuration of adjecent asymmetric carbons






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






7. Softening agents






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






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






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






11. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






16. 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






17. 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






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






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






20. Polymer that is made up a single repeat unit






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






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






23. Is not asymetric and cannot have multiple configurations






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






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






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






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






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






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






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






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






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






33. 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






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






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






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






37. Specific arrangements of atoms that cause organic compounds to behave in predictable ways






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






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






40. Atoms attached to the polymer backbone.






41. An acid and an alcohol






42. 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






43. 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






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






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






46. Double bounded organic molecule used to begin addition polymerization






47. 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






48. 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






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






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