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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. 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






2. Polymer that is made up a single repeat unit






3. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly






4. Coloring agents that do not dissolve into the polymer






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






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






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






8. 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






9. 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






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






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






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






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






14. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance






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






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






17. 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






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






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






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






21. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel






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






23. Porcess of breaking large organic hydrocarbons into smaller molecules






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






25. 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






26. Relative configuration of adjecent asymmetric carbons






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






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






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






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






31. Atoms attached to the polymer backbone.






32. 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






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






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






35. Softening agents






36. Covalent bonding of the polymer backbone and side groups






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






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






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






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






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






42. 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






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






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






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






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






47. 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






48. An acid and an alcohol






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






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