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






2. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed






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






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






5. 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






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






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






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






9. 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






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






11. Molecule containing a highly reactive unpaired electron






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






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






14. Additives that cause swelling - which allows the polymer chains to slide past one another more easily - making the polymer softer and more pliable. also used to decrease the viscosity of cement paste to make it easier to flow






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






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






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






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






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






20. 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






21. 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






22. 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






23. 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






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






25. Conformation that occurs when the largest substituent in a molecule are offset by 60






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






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






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






29. Simple polymeric material produced as pellets in large quantities






30. Coloring agents that do not dissolve into the polymer






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






32. Polymer that is made up a single repeat unit






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






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






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






36. 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






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






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






39. Form of the molecular weight of a sample of polymer chains determined by dividing the mass of the specimen by total number of mols present; always less than weight average molecular weight; all molecules regardless of size correlate well with Mn






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






41. Atoms attached to the polymer backbone.






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






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






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






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






46. 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






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






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






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






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