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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. Molecule containing a highly reactive unpaired electron






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






4. 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






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






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






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






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






9. 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






10. An acid and an alcohol






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






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






13. Number of bonds a molecule has formed






14. 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






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






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






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






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






19. Softening agents






20. 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






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






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






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






24. 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






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






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






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






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






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






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






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






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






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






34. 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






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






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






37. 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






38. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






41. Primary raw material for most polymers






42. Simple polymeric material produced as pellets in large quantities






43. 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






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






45. Coloring agents that do not dissolve into the polymer






46. Atoms attached to the polymer backbone.






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






48. Double bounded organic molecule used to begin addition polymerization






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






50. Covalent bonding of the polymer backbone and side groups