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Modern Material Science And Engineering 2

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
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  • Match each statement with the correct term.
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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. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains






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






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






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






6. 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






7. 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






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






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






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






11. Molecule containing a highly reactive unpaired electron






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






13. 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






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






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






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






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






18. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






21. 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






22. Primary raw material for most polymers






23. 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






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






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






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






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






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






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






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






31. Double bounded organic molecule used to begin addition polymerization






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






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






34. Simple polymeric material produced as pellets in large quantities






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






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






37. Covalent bonding of the polymer backbone and side groups






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






39. 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






40. Polymer that is made up a single repeat unit






41. Number of bonds a molecule has formed






42. Coloring agents that do not dissolve into the polymer






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






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






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






47. Atoms attached to the polymer backbone.






48. Is not asymetric and cannot have multiple configurations






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






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