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






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






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






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






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






6. Is not asymetric and cannot have multiple configurations






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






8. An acid and an alcohol






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






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






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






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






13. 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






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






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






16. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






19. 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






20. 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






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






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






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






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






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






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






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






28. 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






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






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






31. 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






32. Simple polymeric material produced as pellets in large quantities






33. Primary raw material for most polymers






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






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






36. 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






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






38. 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






39. Softening agents






40. Double bounded organic molecule used to begin addition polymerization






41. 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






42. Covalent bonding of the polymer backbone and side groups






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






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






45. 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






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






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






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






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






50. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group