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






2. 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






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






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






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






6. Primary raw material for most polymers






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






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






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






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






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






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






13. 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






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






15. Atoms attached to the polymer backbone.






16. 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






17. Covalent bonding of the polymer backbone and side groups






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






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






20. 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






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






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






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






24. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






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






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






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






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






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






34. 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






35. Polymer that is made up a single repeat unit






36. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






40. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds






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






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






43. Relative configuration of adjecent asymmetric carbons






44. 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






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






46. Coloring agents that do not dissolve into the polymer






47. 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






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






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






50. 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