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






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






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






4. 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






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






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






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






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






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






10. Term used to represent the average molecular weight of a sample containing a wide range of polymer chain lengths. this term is used to avoid confusion between the number average and the weight molecular average weight






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






12. Double bounded organic molecule used to begin addition polymerization






13. Polymer that is made up a single repeat unit






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






15. 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






16. Softening agents






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






18. 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






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






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






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






22. Covalent bonding of the polymer backbone and side groups






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






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






25. 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






26. Simple polymeric material produced as pellets in large quantities






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






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






29. 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






30. Number of bonds a molecule has formed






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






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






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






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






35. Primary raw material for most polymers






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






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






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






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






40. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






43. 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






44. 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






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






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






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






48. 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






49. An acid and an alcohol






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