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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. 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






2. Molecule containing a highly reactive unpaired electron






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






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






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






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






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






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






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






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






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






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






13. Polymer that is made up a single repeat unit






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






15. Porcess of breaking large organic hydrocarbons into smaller molecules






16. Covalent bonding of the polymer backbone and side groups






17. Softening agents






18. Double bounded organic molecule used to begin addition polymerization






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






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






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






22. Primary raw material for most polymers






23. 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






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






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






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






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






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






29. An acid and an alcohol






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






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






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






33. 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






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






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






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






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






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






39. 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






40. 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






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






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






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






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






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






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






47. Coloring agents that do not dissolve into the polymer






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






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






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