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






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






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






5. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer






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






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






8. Part of the extrusion apparatus that contains a heated screw which is used to melt the polymer and the polymer forward into the next chamber






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






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






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






12. 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






13. 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






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






15. 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






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






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






18. An acid and an alcohol






19. Polymer that is made up a single repeat unit






20. Coloring agents that do not dissolve into the polymer






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






22. 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






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






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






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






26. 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






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






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






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






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






31. Double bounded organic molecule used to begin addition polymerization






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






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






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






35. Relative configuration of adjecent asymmetric carbons






36. 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






37. Porcess of breaking large organic hydrocarbons into smaller molecules






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






39. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property






40. 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






41. Softening agents






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






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






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






45. 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






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






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






48. Covalent bonding of the polymer backbone and side groups






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






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