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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. 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






2. Coloring agents that do not dissolve into the polymer






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






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






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






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






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






8. 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






9. 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






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






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






12. 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






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






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






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






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






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






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






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






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






21. 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






22. 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






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






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






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






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






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






28. 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






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






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






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






33. 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






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






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






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






37. 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






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






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






40. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






43. Atoms attached to the polymer backbone.






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






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






46. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device






47. 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






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






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






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