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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 chains of molecules with small monomer units repeated from end to end






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






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






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






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






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






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






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






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






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






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






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






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






14. 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






15. Double bounded organic molecule used to begin addition polymerization






16. Relative configuration of adjecent asymmetric carbons






17. 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






18. 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






19. Molecule containing a highly reactive unpaired electron






20. An acid and an alcohol






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






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






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






24. 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






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






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






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






28. 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






29. Coloring agents that do not dissolve into the polymer






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






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






32. 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






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






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






35. 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






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






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






39. Softening agents






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






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






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






43. 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






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






45. Is not asymetric and cannot have multiple configurations






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






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






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






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






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