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






2. 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






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






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






5. 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






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






7. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






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






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






14. 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






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






16. Formation of side chains along the backbone; presence of branches disrupts the interactions beween adjacent chains; lowering the tensile strength - melting point - stiffness - crystallinity - and density






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






18. 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






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






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






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






22. Softening agents






23. Double bounded organic molecule used to begin addition polymerization






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






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






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






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






28. 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






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






30. Number of bonds a molecule has formed






31. One method of expressing the molecular weight of sample of polymers with averaging based on weight; this method is more useful when large molecules in the sample dominate the behavior






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






33. Simple polymeric material produced as pellets in large quantities






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






35. Relative configuration of adjecent asymmetric carbons






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






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






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






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






40. Polymer that is made up a single repeat unit






41. 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






42. 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






43. Coloring agents that do not dissolve into the polymer






44. Covalent bonding of the polymer backbone and side groups






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






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






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






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






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






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