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






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






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






4. 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






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






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






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






8. 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






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






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






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






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






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






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






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






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






17. Is not asymetric and cannot have multiple configurations






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






19. 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






20. Covalent bonding of the polymer backbone and side groups






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






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






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






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






25. Porcess of breaking large organic hydrocarbons into smaller molecules






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






27. 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






28. 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






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






30. Relative configuration of adjecent asymmetric carbons






31. 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






32. 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






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






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






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






36. Double bounded organic molecule used to begin addition polymerization






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






38. Atoms attached to the polymer backbone.






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






40. Primary raw material for most polymers






41. Term used to represent the average molecular weight of a sample containing a wide range of polymer chain lengths. this term is used to avoid confusion between the number average and the weight molecular average weight






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






43. 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






44. 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






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






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






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






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






50. 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