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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. Porcess of breaking large organic hydrocarbons into smaller molecules






2. 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






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






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






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






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






7. 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






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






9. Polymer that is made up a single repeat unit






10. Number of repeat/structural units in a polymer chain






11. Primary raw material for most polymers






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






13. 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






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






15. Double bounded organic molecule used to begin addition polymerization






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






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






18. Atoms attached to the polymer backbone.






19. 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






20. Number of bonds a molecule has formed






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






22. Molecule containing a highly reactive unpaired electron






23. 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






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






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






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






27. 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






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






29. Covalent bonding of the polymer backbone and side groups






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






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






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






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






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






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






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






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






39. 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






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






41. 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






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






43. 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






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






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






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






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






48. Is not asymetric and cannot have multiple configurations






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






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