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






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






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






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






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






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






7. 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






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






9. Primary raw material for most polymers






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






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






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






13. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability






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






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






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






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






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






19. 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






20. Porcess of breaking large organic hydrocarbons into smaller molecules






21. Double bounded organic molecule used to begin addition polymerization






22. 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






23. 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






24. 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






25. Relative configuration of adjecent asymmetric carbons






26. 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






27. 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






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






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






30. An acid and an alcohol






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






32. Softening agents






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






34. Molecule containing a highly reactive unpaired electron






35. Simple polymeric material produced as pellets in large quantities






36. 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






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






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






39. Coloring agents that do not dissolve into the polymer






40. Covalent bonding of the polymer backbone and side groups






41. Is not asymetric and cannot have multiple configurations






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






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






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






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






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






47. 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






48. Atoms attached to the polymer backbone.






49. 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






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