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






2. Polymer that is made up a single repeat unit






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






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






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






6. An acid and an alcohol






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






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






9. Relative configuration of adjecent asymmetric carbons






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






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






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






13. 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






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






15. Covalent bonding of the polymer backbone and side groups






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






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






18. 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






19. 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






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






21. 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






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






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






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






25. 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






26. 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






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






28. 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






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






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






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






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






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






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






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






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






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






38. 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






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






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






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






42. Softening agents






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






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






45. Porcess of breaking large organic hydrocarbons into smaller molecules






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






47. Number of bonds a molecule has formed






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






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






50. 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