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






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






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






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






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






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






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






8. Molecule containing a highly reactive unpaired electron






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






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






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






12. Coloring agents that do not dissolve into the polymer






13. Polymer that is made up a single repeat unit






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






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






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






17. 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






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






19. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties






20. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.






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






22. 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






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






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






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






26. Primary raw material for most polymers






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






28. 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






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






30. Porcess of breaking large organic hydrocarbons into smaller molecules






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






32. 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






33. 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






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






35. 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






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






37. 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






38. 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






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






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






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






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






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






44. 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






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






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






47. Atoms attached to the polymer backbone.






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






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






50. Is not asymetric and cannot have multiple configurations