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






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






3. Relative configuration of adjecent asymmetric carbons






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






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






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






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






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






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






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






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






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






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






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






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






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






17. 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






18. 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






19. 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






20. Form of the molecular weight of a sample of polymer chains determined by dividing the mass of the specimen by total number of mols present; always less than weight average molecular weight; all molecules regardless of size correlate well with Mn






21. Covalent bonding of the polymer backbone and side groups






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






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






24. 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






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






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






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






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






29. 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






30. Softening agents






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






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






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






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






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






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






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






38. 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






39. 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






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






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. Simple polymeric material produced as pellets in large quantities






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






44. 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






45. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






48. Molecule containing a highly reactive unpaired electron






49. Is not asymetric and cannot have multiple configurations






50. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light