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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. 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






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






3. Relative configuration of adjecent asymmetric carbons






4. Is not asymetric and cannot have multiple configurations






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






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






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






8. Porcess of breaking large organic hydrocarbons into smaller molecules






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 contains a heated screw which is used to melt the polymer and the polymer forward into the next chamber






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






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






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






14. Molecule containing a highly reactive unpaired electron






15. 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






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






17. 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






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






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






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






21. 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






22. 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






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






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






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






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






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






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






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






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






31. Number of bonds a molecule has formed






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






33. Double bounded organic molecule used to begin addition polymerization






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






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






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






37. 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






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






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






40. An acid and an alcohol






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






42. Softening agents






43. Low- molecular- weight building blocks repeated in the polymer chain






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






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






46. 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






47. Primary raw material for most polymers






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






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






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