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






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






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






4. An acid and an alcohol






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






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






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






8. Polymer that is made up a single repeat unit






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






10. Simple polymeric material produced as pellets in large quantities






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






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






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






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






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






16. Softening agents






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






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






19. 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






20. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






25. 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






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






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






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






29. 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






30. Atoms attached to the polymer backbone.






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






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






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






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






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






36. Number of bonds a molecule has formed






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






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






39. Molecule containing a highly reactive unpaired electron






40. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






43. 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






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






45. 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






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






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






48. 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






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






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