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






2. Atoms attached to the polymer backbone.






3. 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






4. Softening agents






5. Term used to represent the average molecular weight of a sample containing a wide range of polymer chain lengths. this term is used to avoid confusion between the number average and the weight molecular average weight






6. Polymers comprised of two or more different monomers that attach to the chain in long runs of one type of monomer - followed by another monomer AAAAAAAAAAAAABBBBBBBBBBBBBBBBBBAAAAAAAA






7. 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






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






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






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






11. Number of bonds a molecule has formed






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






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






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






15. Formation of a polymer that occurs when two potentially reactive end groups on a polymer react to form a new covalent bond between the polymer chain. this reaction also forms a byproduct - which is typically water






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






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






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






19. Coloring agents that do not dissolve into the polymer






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






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






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






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






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






25. 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






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






27. 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






28. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






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






34. 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






35. 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






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






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






38. Relative configuration of adjecent asymmetric carbons






39. Molecule containing a highly reactive unpaired electron






40. Double bounded organic molecule used to begin addition polymerization






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






42. Simple polymeric material produced as pellets in large quantities






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






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






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






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






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






48. 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






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






50. Carbon atom capable of multiple configurations due to four different substituents