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






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






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






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






5. 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






6. Simple polymeric material produced as pellets in large quantities






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






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






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






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






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






12. Atoms attached to the polymer backbone.






13. Relative configuration of adjecent asymmetric carbons






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






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






16. Coloring agents that do not dissolve into the polymer






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






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






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






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






21. 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






22. 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






23. Primary raw material for most polymers






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






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






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






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






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






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






30. 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






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






32. Polymer that is made up a single repeat unit






33. Is not asymetric and cannot have multiple configurations






34. 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






35. 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






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






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






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






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






40. Molecule containing a highly reactive unpaired electron






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






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






43. Softening agents






44. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties






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






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






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






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






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






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