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






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






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






4. 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






5. 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






6. Softening agents






7. 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






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






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






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






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






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






13. 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






14. Primary raw material for most polymers






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






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






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






18. An acid and an alcohol






19. Low- molecular- weight building blocks repeated in the polymer chain






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






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






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






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






24. 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






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






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






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






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






29. Simple polymeric material produced as pellets in large quantities






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






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






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






33. Porcess of breaking large organic hydrocarbons into smaller molecules






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






35. 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






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






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






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






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






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






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






42. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds






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






44. Coloring agents that do not dissolve into the polymer






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






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






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






48. 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






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






50. 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