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






2. Is not asymetric and cannot have multiple configurations






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






4. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings






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






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






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






8. Atoms attached to the polymer backbone.






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






10. 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






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






12. An acid and an alcohol






13. Relative configuration of adjecent asymmetric carbons






14. 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






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






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






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






18. 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






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






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






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






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






23. 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






24. Softening agents






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






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






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






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






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






30. 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






31. 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






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






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






34. Number of bonds a molecule has formed






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






36. Coloring agents that do not dissolve into the polymer






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






38. 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






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






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






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






42. Polymer that is made up a single repeat unit






43. 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






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






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






46. 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






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






48. Double bounded organic molecule used to begin addition polymerization






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






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