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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. 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






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






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






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






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






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






7. 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






8. 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






9. 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






10. 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






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






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






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






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






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






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






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






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






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






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






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






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






23. Polymer that is made up a single repeat unit






24. Is not asymetric and cannot have multiple configurations






25. Porcess of breaking large organic hydrocarbons into smaller molecules






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






27. 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






28. Relative configuration of adjecent asymmetric carbons






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






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






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






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






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






34. 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






35. Primary raw material for most polymers






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






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






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






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






40. 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






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






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






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






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






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






46. Number of bonds a molecule has formed






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






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






49. Double bounded organic molecule used to begin addition polymerization






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