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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. Smallest repeating unit in a polymer. aka repeat unit






2. Coloring agents that do not dissolve into the polymer






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






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






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






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






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






8. 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






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






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






11. Atoms attached to the polymer backbone.






12. An acid and an alcohol






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






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






15. Polymer that is made up a single repeat unit






16. 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






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






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






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






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






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






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






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






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






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






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






27. 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






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






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






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






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






32. Simple polymeric material produced as pellets in large quantities






33. 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






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






35. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties






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






37. 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






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






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






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






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






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






43. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance






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






45. 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






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






47. Primary raw material for most polymers






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






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






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