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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. An acid and an alcohol






2. Covalent bonding of the polymer backbone and side groups






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






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






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






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






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






8. 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






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






10. 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






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






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






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






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






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






16. 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






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






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






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






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






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






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






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






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






25. Number of bonds a molecule has formed






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






27. 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






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






29. Relative configuration of adjecent asymmetric carbons






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






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






32. 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






33. Atoms attached to the polymer backbone.






34. 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






35. Primary raw material for most polymers






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






37. 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






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






39. Coloring agents that do not dissolve into the polymer






40. 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






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






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






43. Simple polymeric material produced as pellets in large quantities






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






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






46. 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






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






48. Double bounded organic molecule used to begin addition polymerization






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






50. 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