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






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






3. 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






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






5. Is not asymetric and cannot have multiple configurations






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






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






8. 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






9. Polymer that is made up a single repeat unit






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






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






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






13. 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






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






15. An acid and an alcohol






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






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






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






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






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






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






23. Number of bonds a molecule has formed






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






25. 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






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






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






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






29. Molecule containing a highly reactive unpaired electron






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






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






32. 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






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






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






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






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






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






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






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






41. 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






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






43. 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






44. 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






45. 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






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






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






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






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






50. Softening agents