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






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






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






4. Number of bonds a molecule has formed






5. Porcess of breaking large organic hydrocarbons into smaller molecules






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






7. Relative configuration of adjecent asymmetric carbons






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






9. 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






10. Is not asymetric and cannot have multiple configurations






11. 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






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






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






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






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






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






17. 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






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






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






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






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






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






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






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






25. Softening agents






26. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






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






33. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets






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






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






36. 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






37. 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






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






39. 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






40. Coloring agents that do not dissolve into the polymer






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






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






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






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






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






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






47. Polymer that is made up a single repeat unit






48. Atoms attached to the polymer backbone.






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






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