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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. Molecule containing a highly reactive unpaired electron






2. 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






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






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






5. 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






6. Relative configuration of adjecent asymmetric carbons






7. 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






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






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






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






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






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






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






14. Atoms attached to the polymer backbone.






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






16. 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






17. Pigments or dyes that change the way light is absorbed or reflected by a polymer






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






19. Covalent bonding of the polymer backbone and side groups






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






21. Simple polymeric material produced as pellets in large quantities






22. Softening agents






23. 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






24. Double bounded organic molecule used to begin addition polymerization






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






26. Polymer that is made up a single repeat unit






27. 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






28. 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






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






30. An acid and an alcohol






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






32. 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






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






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






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






36. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed






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






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






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






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






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






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






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






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






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






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






47. Coloring agents that do not dissolve into the polymer






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






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






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