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






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






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






4. Number of bonds a molecule has formed






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






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






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






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






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






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






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






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






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






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






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






16. 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






17. 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






18. Coloring agents that do not dissolve into the polymer






19. 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






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






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






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






23. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer






24. 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






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






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






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






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






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






30. Polymer that is made up a single repeat unit






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






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






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






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






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






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






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






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






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






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






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






42. 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






43. 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






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






45. Relative configuration of adjecent asymmetric carbons






46. 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






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






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






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






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