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






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






3. Atoms attached to the polymer backbone.






4. Covalent bonding of the polymer backbone and side groups






5. Softening agents






6. Double bounded organic molecule used to begin addition polymerization






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






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






9. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device






10. 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






11. 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






12. Polymer that is made up a single repeat unit






13. 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






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






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. 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






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






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






19. 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






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






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






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






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






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






25. 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






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






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






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






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






30. 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






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






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






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






34. Molecule containing a highly reactive unpaired electron






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






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






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






38. Simple polymeric material produced as pellets in large quantities






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






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






41. 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






42. 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






43. 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






44. Primary raw material for most polymers






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






46. Number of bonds a molecule has formed






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






48. An acid and an alcohol






49. 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






50. Coloring agents that do not dissolve into the polymer