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






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






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






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






5. An acid and an alcohol






6. Covalent bonding of the polymer backbone and side groups






7. Simple polymeric material produced as pellets in large quantities






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






9. 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






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






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






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






13. 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






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






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






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






17. Coloring agents that do not dissolve into the polymer






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






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






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






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






22. 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






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






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






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






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






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






28. 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






29. 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






30. 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






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






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






33. Double bounded organic molecule used to begin addition polymerization






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






35. 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






36. 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






37. 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






38. 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






39. Is not asymetric and cannot have multiple configurations






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






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






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






43. Atoms attached to the polymer backbone.






44. Number of bonds a molecule has formed






45. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






50. 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