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






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






3. An acid and an alcohol






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






5. 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






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






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






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






9. Coloring agents that do not dissolve into the polymer






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






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






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






13. Molecule containing a highly reactive unpaired electron






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






15. 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






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






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






18. 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






19. Double bounded organic molecule used to begin addition polymerization






20. Primary raw material for most polymers






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






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






23. 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






24. 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






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






26. 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






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






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






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






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






31. Polymer that is made up a single repeat unit






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






33. Is not asymetric and cannot have multiple configurations






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






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






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






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






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






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






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






41. 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






42. Simple polymeric material produced as pellets in large quantities






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






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






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






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






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






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






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






50. Softening agents