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






2. Number of repeat/structural units in a polymer chain






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






4. Double bounded organic molecule used to begin addition polymerization






5. 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






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






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






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






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






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






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






12. 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






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






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






15. Low- molecular- weight building blocks repeated in the polymer chain






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






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






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






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






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. 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






22. Simple polymeric material produced as pellets in large quantities






23. Relative configuration of adjecent asymmetric carbons






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






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






26. One method of expressing the molecular weight of sample of polymers with averaging based on weight; this method is more useful when large molecules in the sample dominate the behavior






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






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






29. Number of bonds a molecule has formed






30. 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






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






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






34. Primary raw material for most polymers






35. Molecule containing a highly reactive unpaired electron






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






37. 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






38. 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






39. 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






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






41. Is not asymetric and cannot have multiple configurations






42. 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






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






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






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






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






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






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






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






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