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






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






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






4. 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






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






6. Number of bonds a molecule has formed






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






8. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property






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






10. Porcess of breaking large organic hydrocarbons into smaller molecules






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






12. Primary raw material for most polymers






13. Relative configuration of adjecent asymmetric carbons






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






15. One method of expressing the molecular weight of sample of polymers with averaging based on weight; this method is more useful when large molecules in the sample dominate the behavior






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






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






18. 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






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






20. 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






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






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






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






24. 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






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






26. 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






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






28. Atoms attached to the polymer backbone.






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






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






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






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






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






34. Polymer that is made up a single repeat unit






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






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






37. Coloring agents that do not dissolve into the polymer






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






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






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






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






42. 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






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






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






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






46. 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






47. An acid and an alcohol






48. One of the two different types of termination in the polymerization process. during this type of termination - the free radicals from two different polymer chains join to end the propogation process






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






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