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






2. Simple polymeric material produced as pellets in large quantities






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






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






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






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






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






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






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






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






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






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






14. Is not asymetric and cannot have multiple configurations






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






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






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






18. 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






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






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






21. Molecule containing a highly reactive unpaired electron






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






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






24. 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






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






26. Primary raw material for most polymers






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






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






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






30. 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






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






32. 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






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






34. An acid and an alcohol






35. Polymer that is made up a single repeat unit






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






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






38. 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






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






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






41. Softening agents






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






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






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. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group






46. Number of bonds a molecule has formed






47. 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






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






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






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