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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. Number of bonds a molecule has formed






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






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






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






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






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






7. Polymer that is made up a single repeat unit






8. Relative configuration of adjecent asymmetric carbons






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






10. Coloring agents that do not dissolve into the polymer






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






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






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






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






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






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






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






18. 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






19. Is not asymetric and cannot have multiple configurations






20. 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






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






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






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






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






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






26. Atoms attached to the polymer backbone.






27. Primary raw material for most polymers






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






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






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






32. An acid and an alcohol






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






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






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






36. Covalent bonding of the polymer backbone and side groups






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






38. 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






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






40. 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






41. Process used to make thermoset fibers by performing the polymerization reacting in a solbent as the material flows through a spinneret and into a quenching bath






42. Simple polymeric material produced as pellets in large quantities






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






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






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






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






47. 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






48. Porcess of breaking large organic hydrocarbons into smaller molecules






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






50. 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