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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. An acid and an alcohol






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






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






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






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






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






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






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






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






10. 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






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






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






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






14. Porcess of breaking large organic hydrocarbons into smaller molecules






15. 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






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






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






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






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






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






21. 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






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






23. Softening agents






24. 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






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






26. 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






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






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






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






30. Atoms attached to the polymer backbone.






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






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






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






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






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






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






37. Polymer that is made up a single repeat unit






38. 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






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






40. 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






41. 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






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






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






44. 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






45. First step in the process of polymerization - during which a free radical is formed






46. 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






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






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






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






50. Simple polymeric material produced as pellets in large quantities