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






2. Covalent bonding of the polymer backbone and side groups






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






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






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






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






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






8. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






11. Number of bonds a molecule has formed






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






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






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






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






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






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






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






19. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end






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






21. 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






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






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






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






25. 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






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






27. 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






28. Relative configuration of adjecent asymmetric carbons






29. 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






30. Softening agents






31. An acid and an alcohol






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






33. 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






34. Is not asymetric and cannot have multiple configurations






35. 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






36. Long chain polymers that contain at least 85% of an ester of a substituted aromatic carboxylic acid. these fibers are strong and can dyed or made transpared






37. Atoms attached to the polymer backbone.






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






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






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






41. 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






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






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






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






45. 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






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






47. Coloring agents that do not dissolve into the polymer






48. 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






49. 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






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