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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. Softening agents






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






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






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






5. Relative configuration of adjecent asymmetric carbons






6. Double bounded organic molecule used to begin addition polymerization






7. Atoms attached to the polymer backbone.






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






9. 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






10. 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






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






12. 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






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. 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






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






16. 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






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






18. Molecule containing a highly reactive unpaired electron






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






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






21. Covalent bonding of the polymer backbone and side groups






22. 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






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






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






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






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






27. 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






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






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






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






31. Is not asymetric and cannot have multiple configurations






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






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






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






35. Primary raw material for most polymers






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






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






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






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






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






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






42. 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






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






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






45. An acid and an alcohol






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






47. Simple polymeric material produced as pellets in large quantities






48. 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






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






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