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. Polymer that is made up a single repeat unit






2. 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






3. Primary raw material for most polymers






4. 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






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






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






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






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






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






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






11. 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






12. 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






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






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






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






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






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






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






19. 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






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






21. Relative configuration of adjecent asymmetric carbons






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






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






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






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






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






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






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






30. Double bounded organic molecule used to begin addition polymerization






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






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






33. Coloring agents that do not dissolve into the polymer






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






35. 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






36. 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






37. Covalent bonding of the polymer backbone and side groups






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






39. 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






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






41. 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






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






43. Molecule containing a highly reactive unpaired electron






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






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






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






47. An acid and an alcohol






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






49. Porcess of breaking large organic hydrocarbons into smaller molecules






50. Is not asymetric and cannot have multiple configurations