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






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






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






6. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property






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






8. Covalent bonding of the polymer backbone and side groups






9. Simple polymeric material produced as pellets in large quantities






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






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






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






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






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






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






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






17. First step in the process of polymerization - during which a free radical is formed






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






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






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






21. Part of the polymer processing apparatus through which the polymer is pushed - causing the polymer to form a simple shape - such as a rod or tube






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






23. Molecule containing a highly reactive unpaired electron






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






25. 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






26. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly






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






28. 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






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






30. 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






31. Polymers that contain amide (- N-) groups in the chain






32. 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






33. Is not asymetric and cannot have multiple configurations






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






35. Softening agents






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






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






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






39. 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






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






41. 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






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






43. 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






44. Number of bonds a molecule has formed






45. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit






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






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






48. Polymer that is made up a single repeat unit






49. 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






50. An acid and an alcohol