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






2. 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






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






4. Number of bonds a molecule has formed






5. Relative configuration of adjecent asymmetric carbons






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






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






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






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






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






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






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






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






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






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






16. 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






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






18. An acid and an alcohol






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






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






21. 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






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






23. 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






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






25. 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






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






27. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group






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






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






30. Is not asymetric and cannot have multiple configurations






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






32. Molecule containing a highly reactive unpaired electron






33. 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






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






35. 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






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






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






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






39. 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






40. Softening agents






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






42. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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. Coloring agents that do not dissolve into the polymer






48. 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






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






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