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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. 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






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






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






4. 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






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






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






7. Primary raw material for most polymers






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






9. Polymer that is made up a single repeat unit






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






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






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






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






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






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






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






17. Relative configuration of adjecent asymmetric carbons






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






19. Number of bonds a molecule has formed






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






21. Softening agents






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






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






24. 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






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






26. 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






27. 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






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






29. 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






30. Double bounded organic molecule used to begin addition polymerization






31. Molecule containing a highly reactive unpaired electron






32. Covalent bonding of the polymer backbone and side groups






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






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






35. Is not asymetric and cannot have multiple configurations






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






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






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






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






40. Simple polymeric material produced as pellets in large quantities






41. Coloring agents that do not dissolve into the polymer






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






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






44. 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






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






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






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






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






49. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability






50. Long chain polymers that contain at least 85% of an ester of a substituted aromatic carboxylic acid. these fibers are strong and can dyed or made transpared