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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. Polymer that is made up a single repeat unit






2. 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






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






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






5. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






8. Softening agents






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






10. 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






11. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings






12. Number of bonds a molecule has formed






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






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






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






16. 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






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






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






19. 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






20. Relative configuration of adjecent asymmetric carbons






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






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






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






24. Simple polymeric material produced as pellets in large quantities






25. 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






26. Covalent bonding of the polymer backbone and side groups






27. An acid and an alcohol






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






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






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






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






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






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






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






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






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






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






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






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






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






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






42. Coloring agents that do not dissolve into the polymer






43. Molecule containing a highly reactive unpaired electron






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






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






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






47. Primary raw material for most polymers






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






49. 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






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