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Test your basic knowledge |

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






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






3. Molecule containing a highly reactive unpaired electron






4. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals






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






6. 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






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






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






9. 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






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






11. 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






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






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






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






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






16. Smallest repeating unit in a polymer. aka repeat unit






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






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






19. 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






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






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






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






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






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






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






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






27. Porcess of breaking large organic hydrocarbons into smaller molecules






28. Softening agents






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






30. Polymer that is made up a single repeat unit






31. 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






32. 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






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






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






35. Coloring agents that do not dissolve into the polymer






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






37. Primary raw material for most polymers






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






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






40. 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






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






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






43. 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






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






45. Covalent bonding of the polymer backbone and side groups






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






47. An acid and an alcohol






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






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






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






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