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. 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






2. Molecule containing a highly reactive unpaired electron






3. Primary raw material for most polymers






4. 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






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






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






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






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






9. Polymer that is made up a single repeat unit






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






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






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






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






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






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






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






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






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






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






20. 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






21. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






25. An acid and an alcohol






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






27. 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






28. Atoms attached to the polymer backbone.






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






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






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






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






33. Is not asymetric and cannot have multiple configurations






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






35. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion






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






37. Coloring agents that do not dissolve into the polymer






38. 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






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






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






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. Number of repeat/structural units in a polymer chain






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






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






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






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






47. Two or more polymers mechanically mixed together but without covalent bonding between them






48. Softening agents






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






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