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






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






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






4. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air






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






7. 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






8. 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






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






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






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






12. Double bounded organic molecule used to begin addition polymerization






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






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






15. 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






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






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






18. 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






19. Molecule containing a highly reactive unpaired electron






20. An acid and an alcohol






21. Primary raw material for most polymers






22. Softening agents






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






24. 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






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






27. 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






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






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






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






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






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






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






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






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






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






37. Is not asymetric and cannot have multiple configurations






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






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






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






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






42. Atoms attached to the polymer backbone.






43. Formation of side chains along the backbone; presence of branches disrupts the interactions beween adjacent chains; lowering the tensile strength - melting point - stiffness - crystallinity - and density






44. Porcess of breaking large organic hydrocarbons into smaller molecules






45. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret






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






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






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






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






50. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly