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






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






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






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






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






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






7. Primary raw material for most polymers






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






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






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






11. 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






12. 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






13. 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






14. Porcess of breaking large organic hydrocarbons into smaller molecules






15. Molecule containing a highly reactive unpaired electron






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






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






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






19. Polymer that is made up a single repeat unit






20. 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






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






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






23. Is not asymetric and cannot have multiple configurations






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






25. 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






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






27. 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






28. 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






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






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






31. Double bounded organic molecule used to begin addition polymerization






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






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






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






35. 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






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






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






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






39. 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






40. Coloring agents that do not dissolve into the polymer






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






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






43. Covalent bonding of the polymer backbone and side groups






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






45. An acid and an alcohol






46. 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






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






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






49. Number of bonds a molecule has formed






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