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






2. Molecule containing a highly reactive unpaired electron






3. 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






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






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






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






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






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






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






10. Primary raw material for most polymers






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






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






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






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






15. Coloring agents that do not dissolve into the polymer






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






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






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






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






20. 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






21. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






27. 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






28. 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






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






30. 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






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






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






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






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






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






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






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






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






39. 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






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






41. 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






42. 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






43. Covalent bonding of the polymer backbone and side groups






44. Simple polymeric material produced as pellets in large quantities






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






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






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






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






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






50. 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