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






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






4. Covalent bonding of the polymer backbone and side groups






5. Number of bonds a molecule has formed






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






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






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






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






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






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






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






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






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






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






16. Simple polymeric material produced as pellets in large quantities






17. 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






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






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






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






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






22. 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






23. 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






24. Coloring agents that do not dissolve into the polymer






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






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






27. Softening agents






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






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






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






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






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






33. 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






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






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






36. 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






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






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






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






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






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






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






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






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






45. Is not asymetric and cannot have multiple configurations






46. Part of the polymer processing apparatus through which the polymer is pushed - causing the polymer to form a simple shape - such as a rod or tube






47. Primary raw material for most polymers






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






49. 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






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