Polymer00050 - Higher clay content led to slightly lower...

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39 Table 2.2 Thermal characteristics of fluoroelastomer nanocomposites Samples E a a T g b T 5% c T max d (kJ/mol) ( o C) ( o C) ( o C) Neat FC 2660 81.0 -10.0 452.3 492.4 FC 2660/ 2% S-clay 75.3 -8.5 425.7 475.0 FC 2660/ 4% S-clay 64.5 -8.2 410.0 469.5 FC 2660/ 2% FS-clay 71.1 -6.9 440.7 489.2 FC 2660/ 4% FS-clay 69.2 -3.2 434.9 470.6 FC 2660/ 2% T-G 127.0 -8.0 458.6 494.6 FC 2660/ 4% T-G 124.8 -7.4 454.8 495.1 FC 2660/ 2% UT-SiO 2 72.3 -5.5 458.6 496.3 FC 2660/ 4% UT-SiO 2 67.8 -5.0 466.3 496.5 FC 2660/ 2% T-SiO 2 65.2 -3.9 460.8 498.7 FC 2660/ 4% T-SiO 2 32.6 -3.0 471.1 500.8 a. Ea is activation energy; b. T g is glass transition temperature; c. T 5% is onset degradation temperature; d. T max is temperature of maximum degradation rate. Nanoclay moderately reduced the activation energy of the fluoroelastomer in all four formulations (Table 2).
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Unformatted text preview: Higher clay content led to slightly lower energy for both FS-clay and S-clay, while FS-clay showed a larger effect on reducing Ea than S-clay. Quaternary ammonium salt treated organoclay has been shown to decrease the activation energy of vulcanization and the reason has been ascribed to the accelerating effect of the quaternary ammonium salt (Paciorek, et al. 2003). FS-clay is also an organoclay prepared by treating original clay with a fluoroaliphatic quaternary ammonium, therefore, it is also able to accelerate the process. Moreover, the fluoroaliphatic tail of the ammonium on the surface of FS-clay increased its compatibility with the fluoroelastomer matrix, which improved the dispersion of FS-clay and therefore further promoted the vulcanization of the elastomer....
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This note was uploaded on 08/18/2011 for the course MATSE 447 taught by Professor Colby,r during the Spring '08 term at Pennsylvania State University, University Park.

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