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






2. Molecule containing a highly reactive unpaired electron






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






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






5. 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






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






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






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






9. Porcess of breaking large organic hydrocarbons into smaller molecules






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






11. Is not asymetric and cannot have multiple configurations






12. 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






13. Simple polymeric material produced as pellets in large quantities






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






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






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






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






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






19. 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






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






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






22. An acid and an alcohol






23. 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






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






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






26. 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






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






28. 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






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






30. 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






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






32. Relative configuration of adjecent asymmetric carbons






33. Atoms attached to the polymer backbone.






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






35. Primary raw material for most polymers






36. Double bounded organic molecule used to begin addition polymerization






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






38. Covalent bonding of the polymer backbone and side groups






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






40. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings






41. Polymer that is made up a single repeat unit






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






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






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






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






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






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






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






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






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