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






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






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






4. Carbon atom capable of multiple configurations due to four different substituents






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






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






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






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






9. 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






10. 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






11. 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






12. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed






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






14. 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






15. An acid and an alcohol






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






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






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






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






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






21. 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






22. 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






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






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






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






26. Polymer that is made up a single repeat unit






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






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






29. Primary raw material for most polymers






30. Is not asymetric and cannot have multiple configurations






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






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






33. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






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






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






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






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






42. Atoms attached to the polymer backbone.






43. 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






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






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






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






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






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






49. Relative configuration of adjecent asymmetric carbons






50. 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