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Modern Material Science And Engineering 2

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes. 2 minutes extra for reading the instructions.
  • 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. Relative configuration of adjecent asymmetric carbons






2. 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






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






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






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






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






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






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






9. 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






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






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






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






14. Is not asymetric and cannot have multiple configurations






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. Smallest repeating unit in a polymer. aka repeat unit






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






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






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






20. An acid and an alcohol






21. Simple polymeric material produced as pellets in large quantities






22. 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






23. 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






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






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






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






27. 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






28. Number of bonds a molecule has formed






29. Primary raw material for most polymers






30. 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






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






32. Softening agents






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






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






35. Polymer that is made up a single repeat unit






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






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






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






39. 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






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






41. 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






42. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






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






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






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






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






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