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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. 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






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






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






4. Softening agents






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






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






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






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






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






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






11. 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






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






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






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






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






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






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






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






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






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






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






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






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






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






25. Polymer that is made up a single repeat unit






26. 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






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






28. Polymers that contain amide (- N-) groups in the chain






29. 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






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






31. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups






32. 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






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






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






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






36. 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






37. 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






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






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






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






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






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. An acid and an alcohol






44. Double bounded organic molecule used to begin addition polymerization






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






46. Atoms attached to the polymer backbone.






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






48. Simple polymeric material produced as pellets in large quantities






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






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