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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 that attach to the chain in long runs of one type of monomer - followed by another monomer AAAAAAAAAAAAABBBBBBBBBBBBBBBBBBAAAAAAAA






2. Porcess of breaking large organic hydrocarbons into smaller molecules






3. Specific arrangements of atoms that cause organic compounds to behave in predictable ways






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






5. Molecule containing a highly reactive unpaired electron






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






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






8. 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






9. 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






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






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






12. Is not asymetric and cannot have multiple configurations






13. 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






14. Number of bonds a molecule has formed






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






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






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






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






19. 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






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






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






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






24. Relative configuration of adjecent asymmetric carbons






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






26. Primary raw material for most polymers






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






28. 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






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






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






31. 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






32. 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






33. 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






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






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






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






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






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






39. Covalent bonding of the polymer backbone and side groups






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






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






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






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






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






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






46. Polymer that is made up a single repeat unit






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






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






49. Softening agents






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