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






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






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






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






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






6. Second- order thermodynamic transition in which the onset of large scale chain mobility occures in polymers. Bellow Tg the polymer is glasslike and brittle. above Tg the polymer becomes rubbery and flexible






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






8. 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






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






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






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






13. Porcess of breaking large organic hydrocarbons into smaller molecules






14. 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






15. 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






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






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






18. 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






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






20. Atoms attached to the polymer backbone.






21. Number of bonds a molecule has formed






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






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






24. Polymer that is made up a single repeat unit






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






26. Primary raw material for most polymers






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






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






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






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






31. Double bounded organic molecule used to begin addition polymerization






32. Coloring agents that do not dissolve into the polymer






33. 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






34. Softening agents






35. 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






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






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






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






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






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






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






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






43. Simple polymeric material produced as pellets in large quantities






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






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






46. 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






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






48. 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






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






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