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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. Smallest repeating unit in a polymer. aka repeat unit






2. 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






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






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






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






6. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






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






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






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






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






15. 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






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






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






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






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






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






21. 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






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






23. 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






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






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






26. Softening agents






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






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






29. Number of bonds a molecule has formed






30. Polymer that is made up a single repeat unit






31. 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






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






33. 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






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






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






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






37. 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






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






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






40. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)






41. Specific arrangements of atoms that cause organic compounds to behave in predictable ways






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. Is not asymetric and cannot have multiple configurations






44. Atoms attached to the polymer backbone.






45. 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






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






47. Primary raw material for most polymers






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






49. Covalent bonding of the polymer backbone and side groups






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