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






2. 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






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






4. 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






5. 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






6. Coloring agents that do not dissolve into the polymer






7. Number of bonds a molecule has formed






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






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






10. 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






11. Is not asymetric and cannot have multiple configurations






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






13. 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






14. Covalent bonding of the polymer backbone and side groups






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






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






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






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






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






20. 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






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






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






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






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






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






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






27. Primary raw material for most polymers






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






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






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






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






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






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






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






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






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






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






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






39. 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






40. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads






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






42. Relative configuration of adjecent asymmetric carbons






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






44. An acid and an alcohol






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






46. Double bounded organic molecule used to begin addition polymerization






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






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






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






50. 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