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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. Number of repeat/structural units in a polymer chain






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






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






4. 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






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






6. Atoms attached to the polymer backbone.






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






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






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






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






11. An acid and an alcohol






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






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






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






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






16. 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






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






18. 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






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






20. Specific arrangements of atoms that cause organic compounds to behave in predictable ways






21. 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






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






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






24. 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






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






26. Primary raw material for most polymers






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






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






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






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






32. Softening agents






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






34. 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






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






36. Is not asymetric and cannot have multiple configurations






37. 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






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






39. Coloring agents that do not dissolve into the polymer






40. Double bounded organic molecule used to begin addition polymerization






41. Polymer that is made up a single repeat unit






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






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






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






45. 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






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






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






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






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