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






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






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






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






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






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






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






8. 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






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






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






11. 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






12. Molecule containing a highly reactive unpaired electron






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






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






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






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






17. Coloring agents that do not dissolve into the polymer






18. 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






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






20. Softening agents






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






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






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






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






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






26. 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






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






28. Number of bonds a molecule has formed






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






30. Atoms attached to the polymer backbone.






31. Double bounded organic molecule used to begin addition polymerization






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






33. 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






34. 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






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






36. Simple polymeric material produced as pellets in large quantities






37. 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






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






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






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






41. 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






42. 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






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






44. Relative configuration of adjecent asymmetric carbons






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






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






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






48. Is not asymetric and cannot have multiple configurations






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






50. Pigments or dyes that change the way light is absorbed or reflected by a polymer