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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. Smallest repeating unit in a polymer. aka repeat unit






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






3. 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






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






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






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






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






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






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






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






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






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






13. 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






14. Polymers comprised of two or more different monomers that attach to the chain in long runs of one type of monomer - followed by another monomer AAAAAAAAAAAAABBBBBBBBBBBBBBBBBBAAAAAAAA






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






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






17. Coloring agents that do not dissolve into the polymer






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






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






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






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






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






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






24. Simple polymeric material produced as pellets in large quantities






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






26. 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






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






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






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






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






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






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






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






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






36. Is not asymetric and cannot have multiple configurations






37. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants






38. Additives that cause swelling - which allows the polymer chains to slide past one another more easily - making the polymer softer and more pliable. also used to decrease the viscosity of cement paste to make it easier to flow






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






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






41. Number of bonds a molecule has formed






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






43. An acid and an alcohol






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






45. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants






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






47. 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






48. 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






49. 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






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