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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. 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






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






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






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






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






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






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






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






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






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






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






13. 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






14. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups






15. 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






16. Relative configuration of adjecent asymmetric carbons






17. Number of bonds a molecule has formed






18. Molecule containing a highly reactive unpaired electron






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






20. Is not asymetric and cannot have multiple configurations






21. Coloring agents that do not dissolve into the polymer






22. Polymer that is made up a single repeat unit






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






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






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






26. Porcess of breaking large organic hydrocarbons into smaller molecules






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






28. 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






29. Softening agents






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






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






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






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






34. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device






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






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






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






38. 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






39. Double bounded organic molecule used to begin addition polymerization






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






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






42. Atoms attached to the polymer backbone.






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






44. 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






45. 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






46. An acid and an alcohol






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






48. Covalent bonding of the polymer backbone and side groups






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






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