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






2. 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






3. 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






4. Primary raw material for most polymers






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






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






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






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






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






10. Relative configuration of adjecent asymmetric carbons






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






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






13. Porcess of breaking large organic hydrocarbons into smaller molecules






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






15. Is not asymetric and cannot have multiple configurations






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






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






18. 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






19. 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






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






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






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






23. 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






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






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






26. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds






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






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






29. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets






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






31. 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






32. 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






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






34. Polymer that is made up a single repeat unit






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






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






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






38. Double bounded organic molecule used to begin addition polymerization






39. 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






40. 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






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






42. Covalent bonding of the polymer backbone and side groups






43. Molecule containing a highly reactive unpaired electron






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






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






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






47. 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






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






49. Atoms attached to the polymer backbone.






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