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






2. 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






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






4. 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






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






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






7. 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






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






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






10. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






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. Form of the molecular weight of a sample of polymer chains determined by dividing the mass of the specimen by total number of mols present; always less than weight average molecular weight; all molecules regardless of size correlate well with Mn






17. Is not asymetric and cannot have multiple configurations






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






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






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






21. Number of bonds a molecule has formed






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






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






24. Covalent bonding of the polymer backbone and side groups






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






26. 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






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






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






29. Double bounded organic molecule used to begin addition polymerization






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






31. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed






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






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






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






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






36. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups






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






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






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






40. Relative configuration of adjecent asymmetric carbons






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






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






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






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






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






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






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






48. 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






49. 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






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







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