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






2. 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






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






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






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






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






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






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






10. 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






11. 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






12. Covalent bonding of the polymer backbone and side groups






13. Is not asymetric and cannot have multiple configurations






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






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






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






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






18. 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






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






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






21. Primary raw material for most polymers






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






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






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






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






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






27. Formation of a polymer that occurs when two potentially reactive end groups on a polymer react to form a new covalent bond between the polymer chain. this reaction also forms a byproduct - which is typically water






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






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






30. 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






31. 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






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






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






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






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






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






37. Relative configuration of adjecent asymmetric carbons






38. Simple polymeric material produced as pellets in large quantities






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






40. 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






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






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






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






44. 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






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






46. Porcess of breaking large organic hydrocarbons into smaller molecules






47. Softening agents






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






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






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