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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. Atoms attached to the polymer backbone.






2. 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






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






4. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group






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






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






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






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






9. 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






10. Coloring agents that do not dissolve into the polymer






11. Simple polymeric material produced as pellets in large quantities






12. An acid and an alcohol






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






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






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






16. 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






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






18. 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






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






20. Primary raw material for most polymers






21. Porcess of breaking large organic hydrocarbons into smaller molecules






22. Relative configuration of adjecent asymmetric carbons






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






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






25. 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






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






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






28. 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






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






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






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






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






33. 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






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






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






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






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






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






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






40. 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






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






42. 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






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






44. Is not asymetric and cannot have multiple configurations






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






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






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






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






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