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






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






3. 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






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






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






6. 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






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






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






9. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property






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






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






12. 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






13. An acid and an alcohol






14. Number of bonds a molecule has formed






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






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






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






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






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






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






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






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






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






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






25. 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






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






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






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






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






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






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






32. Atoms attached to the polymer backbone.






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






34. 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






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






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






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






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






40. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.






41. 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






42. 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






43. Molecule containing a highly reactive unpaired electron






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






45. Is not asymetric and cannot have multiple configurations






46. Porcess of breaking large organic hydrocarbons into smaller molecules






47. Covalent bonding of the polymer backbone and side groups






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






49. 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






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