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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. 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






2. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






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






8. Primary raw material for most polymers






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






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. Is not asymetric and cannot have multiple configurations






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






13. 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






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






15. 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






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






17. Number of bonds a molecule has formed






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






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






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






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






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






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






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






25. 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






26. Coloring agents that do not dissolve into the polymer






27. Relative configuration of adjecent asymmetric carbons






28. 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






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






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






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






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






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






34. 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






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






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






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






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






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






40. 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






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






42. 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






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






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






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






46. Simple polymeric material produced as pellets in large quantities






47. 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






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






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






50. 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