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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 polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit






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






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






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






5. Polymer that is made up a single repeat unit






6. Molecule containing a highly reactive unpaired electron






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






8. Relative configuration of adjecent asymmetric carbons






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






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






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






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






13. 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






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






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






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






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






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






19. Porcess of breaking large organic hydrocarbons into smaller molecules






20. 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






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






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






23. Double bounded organic molecule used to begin addition polymerization






24. Is not asymetric and cannot have multiple configurations






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






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






27. 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






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






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






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






31. Atoms attached to the polymer backbone.






32. Primary raw material for most polymers






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






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






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






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






37. Number of bonds a molecule has formed






38. 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






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






40. 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






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






42. 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






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






44. Coloring agents that do not dissolve into the polymer






45. 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






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






47. 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






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






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






50. 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