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






2. Porcess of breaking large organic hydrocarbons into smaller molecules






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






4. 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






5. Primary raw material for most polymers






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






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






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






9. 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






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






11. Softening agents






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






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






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






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. Double bounded organic molecule used to begin addition polymerization






17. Atoms attached to the polymer backbone.






18. 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






19. 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






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






21. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit






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






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






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






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






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






27. 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






28. Simple polymeric material produced as pellets in large quantities






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






30. Number of bonds a molecule has formed






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






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






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






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






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






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






37. Molecule containing a highly reactive unpaired electron






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






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






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






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






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






43. Covalent bonding of the polymer backbone and side groups






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






45. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.






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






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






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






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






50. Coloring agents that do not dissolve into the polymer