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






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






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






4. 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






5. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






8. 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






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






10. 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






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






12. Relative configuration of adjecent asymmetric carbons






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






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






15. Molecule containing a highly reactive unpaired electron






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






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






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






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






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






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






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






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






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






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






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






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






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






30. Number of bonds a molecule has formed






31. Softening agents






32. Simple polymeric material produced as pellets in large quantities






33. 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






34. 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






35. 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






36. 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






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






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






39. 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






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






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






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






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






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






45. Covalent bonding of the polymer backbone and side groups






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






47. Is not asymetric and cannot have multiple configurations






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






49. Primary raw material for most polymers






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