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






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






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






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






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






6. 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






7. 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






8. 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






9. Primary raw material for most polymers






10. 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






11. Coloring agents that do not dissolve into the polymer






12. 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






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






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






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






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






17. 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






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






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






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






21. Atoms attached to the polymer backbone.






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






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






24. Simple polymeric material produced as pellets in large quantities






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






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






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






28. Porcess of breaking large organic hydrocarbons into smaller molecules






29. 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






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






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






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






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






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






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






36. 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






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






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






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






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






41. 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






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






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






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






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






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






47. Covalent bonding of the polymer backbone and side groups






48. Molecule containing a highly reactive unpaired electron






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






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