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






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






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






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






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






7. 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






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






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






10. Relative configuration of adjecent asymmetric carbons






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






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






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






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






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






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






17. Porcess of breaking large organic hydrocarbons into smaller molecules






18. Softening agents






19. Atoms attached to the polymer backbone.






20. 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






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






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. 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






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






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






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






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






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






29. 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






30. 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






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






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






33. 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






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






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






36. 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






37. 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






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






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






40. Simple polymeric material produced as pellets in large quantities






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






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






43. 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






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






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






46. 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






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






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






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






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