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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. Primary raw material for most polymers






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






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






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






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






6. Is not asymetric and cannot have multiple configurations






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






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






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






10. Relative configuration of adjecent asymmetric carbons






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






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






13. Molecule containing a highly reactive unpaired electron






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






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. 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






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






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






19. Simple polymeric material produced as pellets in large quantities






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






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






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






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






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






25. 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






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






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






28. Polymer that is made up a single repeat unit






29. 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






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






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






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






33. 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






34. Long chain polymers that contain at least 85% of an ester of a substituted aromatic carboxylic acid. these fibers are strong and can dyed or made transpared






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






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






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






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






39. 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






40. Porcess of breaking large organic hydrocarbons into smaller molecules






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






42. 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






43. 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






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






45. Covalent bonding of the polymer backbone and side groups






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






47. Coloring agents that do not dissolve into the polymer






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






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






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