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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. 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






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






3. 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






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






5. 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






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






7. Simple polymeric material produced as pellets in large quantities






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






9. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






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






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






16. Two or more polymers mechanically mixed together but without covalent bonding between them






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






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






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






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






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






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






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






24. Relative configuration of adjecent asymmetric carbons






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






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






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






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






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






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






31. 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






32. 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






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






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






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






36. Primary raw material for most polymers






37. An acid and an alcohol






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






39. Coloring agents that do not dissolve into the polymer






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






41. Polymer that is made up a single repeat unit






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






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






44. Number of bonds a molecule has formed






45. 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






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






47. Softening agents






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






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






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