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






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






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






4. 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






5. 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






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






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






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






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






10. 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






11. Primary raw material for most polymers






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






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






15. 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






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






17. 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






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






19. Is not asymetric and cannot have multiple configurations






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






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






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






23. An acid and an alcohol






24. Covalent bonding of the polymer backbone and side groups






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






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






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






28. Relative configuration of adjecent asymmetric carbons






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






30. 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






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






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






33. 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






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






35. Double bounded organic molecule used to begin addition polymerization






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






37. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






40. 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






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






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






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






44. Polymer that is made up a single repeat unit






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






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






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






48. Molecule containing a highly reactive unpaired electron






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






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