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






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






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






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






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






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






7. Number of bonds a molecule has formed






8. Molecule containing a highly reactive unpaired electron






9. 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






10. 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






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






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






13. Is not asymetric and cannot have multiple configurations






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






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






16. 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






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






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






19. 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






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






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






22. 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






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






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






25. Covalent bonding of the polymer backbone and side groups






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






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






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






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






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






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






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






33. 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






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






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






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






37. Double bounded organic molecule used to begin addition polymerization






38. 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






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






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






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






42. Primary raw material for most polymers






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






44. An acid and an alcohol






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






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






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






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






49. Simple polymeric material produced as pellets in large quantities






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