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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. Porcess of breaking large organic hydrocarbons into smaller molecules






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






3. Softening agents






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






5. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants






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






7. Relative configuration of adjecent asymmetric carbons






8. Primary raw material for most polymers






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






10. Is not asymetric and cannot have multiple configurations






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






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






13. 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






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






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






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






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






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






19. 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






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






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






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






23. 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






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






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






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






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






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






29. 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






30. 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






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






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






33. Atoms attached to the polymer backbone.






34. 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






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






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






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






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






39. Number of bonds a molecule has formed






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






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






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






43. Molecule containing a highly reactive unpaired electron






44. 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






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






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






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






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






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






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