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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. Number of repeat/structural units in a polymer chain






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






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






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






5. 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






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






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






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






9. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains






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






11. 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






12. Coloring agents that do not dissolve into the polymer






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






14. Primary raw material for most polymers






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






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






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






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






19. Relative configuration of adjecent asymmetric carbons






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






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






22. Polymer that is made up a single repeat unit






23. 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






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






25. 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






26. 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






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






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






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






30. Softening agents






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






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






33. An acid and an alcohol






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






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






36. Simple polymeric material produced as pellets in large quantities






37. Molecule containing a highly reactive unpaired electron






38. Double bounded organic molecule used to begin addition polymerization






39. 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






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






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






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






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






44. 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






45. 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






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






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






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






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






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