Thermal degradation of poly(vinyl butyral) in alumina, mullite and silica composites
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Abstract
Thermal degradation of poly(vinyl butyral) (PVB) and its mixtures with alumina, mullite and silica was investigated by non-isothermal thermogravimetry in the temperature range of 323 to 1273 K. The analysis of the data was carried out using a three-dimensional diffusion model. Results showed that the kinetic parameters (activation energy and pre-exponential factor) of the PVB degradation are different for polymer alone, and ceramic/polymer composites. The overall weighted mean apparent activation energy showed an increasing reactivity in the order of PVB<alumina+PVB<mullite+PVB<silica+PVB. This shows that the acidic and basic surface characteristics of the ceramics promote the thermal degradation of PVB and, the more acidic silica affects the degradation more than mullite and alumina. The effect of pellet compression pressure in the range of 4000 to 8000 psig is also investigated.
Keywords
ceramics kinetic analysis polymer PVB thermal degradationPreview
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References
- 1.K. Niwa et al., ‘Multilayer Ceramic Circuit Board with Copper Conductor’, Multilayer Ceramic Devices, Editors: J. B. Blum and W. R. Cannon, Adv. Ceramics, 19 (1986) 41.Google Scholar
- 2.R. R. Tummala, J. Am. Ceram. Soc., 74 (1991) 895.CrossRefGoogle Scholar
- 3.P. Bataille and B. T. Van, J. Thermal Anal., 8 (1975) 141.CrossRefGoogle Scholar
- 4.M. F. Barkht, Pak. J. Sci. Ind. Res., 26 (1983) 35.Google Scholar
- 5.W. K. Shih et al., ‘Pyrolysis of Poly(Vinyl Butyral) Binders; I, Degradation Mechanism,’ p. 549 in Ceramic Transactions, Vol I., Ceramic Powder Science, IIA. Edited by G. L. Messing et al. Am. Ceram. Soc. Westerville, OH, 1988.Google Scholar
- 6.K. E. Howard et al., J. Am. Ceram. Soc., 73 (1990) 2543.CrossRefGoogle Scholar
- 7.Y. N. Sun et al., ‘Pyrolysis Behavior of Acrylic Polymers and Acrylic Polymer/Ceramic Mixtures,’ pp. 538 in Ceramic Transactions, Vol I., Ceramic Powder Science, IIA. Edited by G. L. Messing et al., Am. Ceram. Soc., Westerville, OH, 1988.Google Scholar
- 8.S. Masia et al., J. Material Sci., 24 (1989) 1907.Google Scholar
- 9.G. W. Scheiffele and M. D. Sacks, ‘Pyrolysis of Poly/Vinyl Butyral) Binders: I Degradation Mechanism’, p. 559 in Ceramic Transactions, Vol I., Ceramic Powder Science, IIA. Edited by G. L. Messing et al., Am. Ceram. Soc., Westerville, OH, 1988.Google Scholar
- 10.A. A. Parker et al., J. Appl. Polymer Sci., 48 (1993) 1701.CrossRefGoogle Scholar
- 11.M. J. Cima et al., ‘Firing-Atmosphere Effects on Char Content from Alumina-Polyvinyl Butyral Films’, p. 567 in Ceramic Transactions, Vol. I., Ceramic Powder Science, IIA. Edited by G. L. Messing et al., Am. Ceram. Soc. Westerville, OH, 1988.Google Scholar
- 12.M. T. Bryk, Degradation of Filled Polymers High Temperature and Thermal-Oxidative Processes, Ellis Horwood, New York, NY, 1991.Google Scholar
- 13.V. I. Grachev et al., A Spectroscopic Study of the Kinetics of Thermal Oxidative Degradation of Poly(vinyl butyral), Vysokomol. Soyed. A16: 2 (1974) 317.Google Scholar
- 14.T. C. Yang et al., Heat Capacity of Composites of Alumina, Mullite and Silica, presented at The Polymer processing Society Meeting, West Virginia University, Morgontown, WV, August (1993).Google Scholar
- 15.M. V. Boddu et al., J. Am. Ceram. Soc., 73 (1990) 1701.Google Scholar
- 16.C. H. Bamford and C. F. H. Tipper, Reactions in Solid State, Elsevier Scientific, New York, NY, 1980, p. 74.Google Scholar
- 17.V. N. Klyuchnikov et al., Polymer Sci. U.S.S.R., 31 (1989) 735.CrossRefGoogle Scholar
- 18.T. Ozawa and T. Kato, J. Thermal Anal., 37 (1991) 1299.CrossRefGoogle Scholar
- 19.J. Zsakó and J. Zsakó, Jr., J. Thermal Anal., 19 (1980) 333.CrossRefGoogle Scholar
- 20.T. V. Lee and S. R. Beck, AIChE J., 30 (1984) 517.CrossRefGoogle Scholar
- 21.S. Ma et al., J. Thermal Anal., 37 (1991) 1161.CrossRefGoogle Scholar
- 22.J. W. Cumming, Fuel, 63 (1984) 1436.CrossRefGoogle Scholar