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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 repeat/structural units in a polymer chain






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






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






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






5. 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






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






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






9. 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






10. Relative configuration of adjecent asymmetric carbons






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






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






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






14. 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






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






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






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






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






19. 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






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






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






22. Is not asymetric and cannot have multiple configurations






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






24. Molecule containing a highly reactive unpaired electron






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






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






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






28. Covalent bonding of the polymer backbone and side groups






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






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






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






32. 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






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






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






35. 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






36. Primary raw material for most polymers






37. Polymer that is made up a single repeat unit






38. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property






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






40. 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






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






42. 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






43. 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






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






45. Second- order thermodynamic transition in which the onset of large scale chain mobility occures in polymers. Bellow Tg the polymer is glasslike and brittle. above Tg the polymer becomes rubbery and flexible






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






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






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






49. Number of bonds a molecule has formed






50. Porcess of breaking large organic hydrocarbons into smaller molecules