Test your basic knowledge |

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. Second- order thermodynamic transition in which the onset of large scale chain mobility occures in polymers. Bellow Tg the polymer is glasslike and brittle. above Tg the polymer becomes rubbery and flexible






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






4. 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






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






6. Coloring agents that do not dissolve into the polymer






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






8. 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






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






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






11. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination






12. 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






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






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






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






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






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






18. 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






19. Is not asymetric and cannot have multiple configurations






20. Covalent bonding of the polymer backbone and side groups






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






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






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






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






25. Additives whose primary purpose is to reduce the final cost of the product






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






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






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






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






30. 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






31. 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






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






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






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






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






36. Relative configuration of adjecent asymmetric carbons






37. Primary raw material for most polymers






38. Atoms attached to the polymer backbone.






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






40. Porcess of breaking large organic hydrocarbons into smaller molecules






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






42. 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






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






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






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






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






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






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






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