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






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






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






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






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






6. An acid and an alcohol






7. 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






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






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






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






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






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






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






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






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






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






17. Additives that cause swelling - which allows the polymer chains to slide past one another more easily - making the polymer softer and more pliable. also used to decrease the viscosity of cement paste to make it easier to flow






18. 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






19. Primary raw material for most polymers






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






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






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






23. 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






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






25. 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






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






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






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






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






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






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






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






33. Molecule containing a highly reactive unpaired electron






34. Double bounded organic molecule used to begin addition polymerization






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






36. 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






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






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






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






40. 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






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






42. 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






43. Is not asymetric and cannot have multiple configurations






44. Conformation that occurs when the largest substituent in a molecule are offset by 60






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






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






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






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






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






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