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






2. 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






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






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






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






6. 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






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






8. Double bounded organic molecule used to begin addition polymerization






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






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






11. 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






12. Relative configuration of adjecent asymmetric carbons






13. 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






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






15. An acid and an alcohol






16. Atoms attached to the polymer backbone.






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






18. Molecule containing a highly reactive unpaired electron






19. 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






20. 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






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






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






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






25. 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






26. Polymer that is made up a single repeat unit






27. Simple polymeric material produced as pellets in large quantities






28. Primary raw material for most polymers






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






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






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






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






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






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






35. Is not asymetric and cannot have multiple configurations






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






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






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






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






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






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






42. 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






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






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






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






47. Softening agents






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






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






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