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






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






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






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






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






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






7. Is not asymetric and cannot have multiple configurations






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






9. Number of bonds a molecule has formed






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






11. 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






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






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






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






15. Coloring agents that do not dissolve into the polymer






16. Primary raw material for most polymers






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






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






19. 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






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






21. 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






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






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






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






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






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






27. Polymer that is made up a single repeat unit






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






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






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






31. An acid and an alcohol






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






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






34. 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






35. Porcess of breaking large organic hydrocarbons into smaller molecules






36. 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






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






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






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






40. Relative configuration of adjecent asymmetric carbons






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






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






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






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






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






47. Covalent bonding of the polymer backbone and side groups






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






49. 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






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