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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. 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






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






3. Number of repeat/structural units in a polymer chain






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






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






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






7. 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






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






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






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






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






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






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






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






15. Atoms attached to the polymer backbone.






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






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






18. Simple polymeric material produced as pellets in large quantities






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






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






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






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






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






24. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain






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






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






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






28. Primary raw material for most polymers






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






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






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






32. 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






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






34. 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






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






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






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






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






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






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






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






42. 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






43. 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






44. 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






45. 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






46. 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






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






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






49. 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






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