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






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






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






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






6. An acid and an alcohol






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






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






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






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






11. Simple polymeric material produced as pellets in large quantities






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






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






14. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants






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






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






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






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






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






20. Double bounded organic molecule used to begin addition polymerization






21. Coloring agents that do not dissolve into the polymer






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






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






24. 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






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






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






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






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






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






30. 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






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






32. Polymer that is made up a single repeat unit






33. 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






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






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. Covalent bonding of the polymer backbone and side groups






37. 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






38. 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






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






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






41. 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






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






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






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






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






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






47. Primary raw material for most polymers






48. 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






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






50. 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