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






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






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






4. Form of the molecular weight of a sample of polymer chains determined by dividing the mass of the specimen by total number of mols present; always less than weight average molecular weight; all molecules regardless of size correlate well with Mn






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






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






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






8. Number of bonds a molecule has formed






9. 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






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






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






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






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






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






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






17. 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






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






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






20. Covalent bonding of the polymer backbone and side groups






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






22. 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






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






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






25. 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






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






27. 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






28. 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






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






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






31. Double bounded organic molecule used to begin addition polymerization






32. Softening agents






33. 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






34. 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






35. 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






36. 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






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






38. 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






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






40. Molecule containing a highly reactive unpaired electron






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






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






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






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






45. Primary raw material for most polymers






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






47. Simple polymeric material produced as pellets in large quantities






48. Atoms attached to the polymer backbone.






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






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