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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. Is not asymetric and cannot have multiple configurations






2. Atoms attached to the polymer backbone.






3. 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






4. 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






5. 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






6. 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






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






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






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






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






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






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






13. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light






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






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






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






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






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






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






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






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






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






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






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






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






26. Number of bonds a molecule has formed






27. Primary raw material for most polymers






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






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






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






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






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






33. Simple polymeric material produced as pellets in large quantities






34. Porcess of breaking large organic hydrocarbons into smaller molecules






35. 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






36. 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






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






38. Molecule containing a highly reactive unpaired electron






39. 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






40. 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






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






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






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






44. 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






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






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






47. Covalent bonding of the polymer backbone and side groups






48. Softening agents






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






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