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Modern Material Science And Engineering 2

Subject : engineering
Instructions:
  • Answer 50 questions in 20 minutes. 2 minutes extra for reading the instructions.
  • 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. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability






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






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






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






6. Is not asymetric and cannot have multiple configurations






7. Relative configuration of adjecent asymmetric carbons






8. 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






9. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color






10. 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






11. Porcess of breaking large organic hydrocarbons into smaller molecules






12. Coloring agents that do not dissolve into the polymer






13. 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






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






15. 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






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






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






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






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






20. Number of bonds a molecule has formed






21. Primary raw material for most polymers






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






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






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






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






26. 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






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






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






30. Atoms attached to the polymer backbone.






31. An acid and an alcohol






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






33. 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






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






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






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






37. 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






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






39. Molecule containing a highly reactive unpaired electron






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






41. 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






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






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






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






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






46. 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






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






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






49. 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






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