Test your basic knowledge |

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. 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






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. Broad category of polymers that includes polymers containing urethane linkages






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






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






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






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






8. Polymer that is made up a single repeat unit






9. Is not asymetric and cannot have multiple configurations






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






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






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






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






14. Relative configuration of adjecent asymmetric carbons






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






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






17. Coloring agents that do not dissolve into the polymer






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






19. 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






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






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






22. Double bounded organic molecule used to begin addition polymerization






23. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains






24. 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






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






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






27. 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






28. An acid and an alcohol






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






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






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






32. Simple polymeric material produced as pellets in large quantities






33. Number of bonds a molecule has formed






34. 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






35. 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






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






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






38. Primary raw material for most polymers






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






40. 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






41. Molecule containing a highly reactive unpaired electron






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






43. 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






44. 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






45. 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






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






47. Softening agents






48. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings






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






50. 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