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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. Coloring agents that do not dissolve into the polymer






2. Is not asymetric and cannot have multiple configurations






3. Formation of side chains along the backbone; presence of branches disrupts the interactions beween adjacent chains; lowering the tensile strength - melting point - stiffness - crystallinity - and density






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






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






6. Double bounded organic molecule used to begin addition polymerization






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






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






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. Molecule containing a highly reactive unpaired electron






11. Part of the polymer processing apparatus through which the polymer is pushed - causing the polymer to form a simple shape - such as a rod or tube






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






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






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






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






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






17. Atoms attached to the polymer backbone.






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






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






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






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






22. Number of bonds a molecule has formed






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






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






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






26. Covalent bonding of the polymer backbone and side groups






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






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






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






30. 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






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






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






33. 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






34. 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






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






36. 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






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






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






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






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






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






42. 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






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






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






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






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






47. Primary raw material for most polymers






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






49. 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






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