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






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






3. Primary raw material for most polymers






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






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






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






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






8. Second- order thermodynamic transition in which the onset of large scale chain mobility occures in polymers. Bellow Tg the polymer is glasslike and brittle. above Tg the polymer becomes rubbery and flexible






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






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






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






12. 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






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






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






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






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






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






19. Number of bonds a molecule has formed






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






21. Double bounded organic molecule used to begin addition polymerization






22. 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






23. 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






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






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






26. Porcess of breaking large organic hydrocarbons into smaller molecules






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






28. 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






29. Coloring agents that do not dissolve into the polymer






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






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






32. Polymer that is made up a single repeat unit






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






34. 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






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






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






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






38. Softening agents






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






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






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






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






43. 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






44. 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






45. An acid and an alcohol






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






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






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






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






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