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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. 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






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






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






4. 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






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






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






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






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






9. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret






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






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






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






13. 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






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






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






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






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






18. Relative configuration of adjecent asymmetric carbons






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






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






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






22. Double bounded organic molecule used to begin addition polymerization






23. 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






24. Simple polymeric material produced as pellets in large quantities






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






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






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






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






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






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






31. Polymer that is made up a single repeat unit






32. An acid and an alcohol






33. 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






34. Covalent bonding of the polymer backbone and side groups






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






36. Molecule containing a highly reactive unpaired electron






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






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






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






40. Is not asymetric and cannot have multiple configurations






41. 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






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






43. 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






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






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






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






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






48. 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






49. 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






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