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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. Broad category of polymers that includes polymers containing urethane linkages






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






3. 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






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






5. Coloring agents that do not dissolve into the polymer






6. 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






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






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






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






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






11. 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






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






13. Second- order thermodynamic transition in which the onset of large scale chain mobility occures in polymers. Bellow Tg the polymer is glasslike and brittle. above Tg the polymer becomes rubbery and flexible






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






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






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






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






19. 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






20. 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






21. 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






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






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






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






25. Simple polymeric material produced as pellets in large quantities






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






27. Atoms attached to the polymer backbone.






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






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






30. Covalent bonding of the polymer backbone and side groups






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






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






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






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






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






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






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






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






39. Porcess of breaking large organic hydrocarbons into smaller molecules






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






41. Primary raw material for most polymers






42. 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






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






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






45. Part of the polymer processing apparatus through which the polymer is pushed - causing the polymer to form a simple shape - such as a rod or tube






46. 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






47. Softening agents






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






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






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