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






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






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






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






5. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit






6. Molecule containing a highly reactive unpaired electron






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






8. 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






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






10. Primary raw material for most polymers






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






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






13. 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






14. 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






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






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






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






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






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






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






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






22. 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






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






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






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






26. 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






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






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






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






31. Configuration of a substituent in a polymer - in which the substituent is located on the same side of the polymer chain in all repeating units






32. 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






33. Covalent bonding of the polymer backbone and side groups






34. 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






35. 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






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






37. Coloring agents that do not dissolve into the polymer






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






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






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






41. Is not asymetric and cannot have multiple configurations






42. 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






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






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






45. Number of bonds a molecule has formed






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






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






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






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






50. 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