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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. Softening agents






2. Coloring agents that do not dissolve into the polymer






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






4. An acid and an alcohol






5. 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






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






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






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






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






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






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






12. 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






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






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






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






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






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






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






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






20. Double bounded organic molecule used to begin addition polymerization






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






22. Number of bonds a molecule has formed






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






24. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains






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






26. 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






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






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






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






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






31. 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






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






33. Atoms attached to the polymer backbone.






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






35. 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






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






37. Relative configuration of adjecent asymmetric carbons






38. 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






39. 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






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






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






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






43. 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






44. 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






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






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






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






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






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






50. Polymer that is made up a single repeat unit