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






2. Is not asymetric and cannot have multiple configurations






3. 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






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






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






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






7. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group






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






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






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






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






12. Covalent bonding of the polymer backbone and side groups






13. 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






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






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






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






17. 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






18. An acid and an alcohol






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






20. 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






21. 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






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






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






24. Softening agents






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






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






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






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






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






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






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






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






33. Primary raw material for most polymers






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






35. Coloring agents that do not dissolve into the polymer






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






37. 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






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






39. 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






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






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






42. Atoms attached to the polymer backbone.






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






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






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






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






47. Relative configuration of adjecent asymmetric carbons






48. Molecule containing a highly reactive unpaired electron






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






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