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






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






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






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






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






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






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






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






9. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device






10. 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






11. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






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. 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






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






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






20. Additives that cause swelling - which allows the polymer chains to slide past one another more easily - making the polymer softer and more pliable. also used to decrease the viscosity of cement paste to make it easier to flow






21. Number of bonds a molecule has formed






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






23. Coloring agents that do not dissolve into the polymer






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






25. 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






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






27. Simple polymeric material produced as pellets in large quantities






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






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






30. Primary raw material for most polymers






31. 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






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






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






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






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






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






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






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






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






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






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






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






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






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






45. 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






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






47. 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






48. Is not asymetric and cannot have multiple configurations






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






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