optimal composition in synthetic graphite (SG)–phenolic nanocomposites subjected to an in-plane heat flux. Several numerical and analytical studies have been devoted to transient thermal analysis to investigate the effect of main parameters in
. 2. Ashraf , M. A. , Ashraf , M. , Ali , Q. ( 2010 ) Response of two genetically diverse wheat cultivars to salt stress at different growth stages: leaf lipid peroxidation and phenolic
.G., Hong, S.P., Hung, M.H.: Removal and bioconversion of phenol in wastewater by thermostable b-tyrosinase. Enzyme Microb. Technol. 19 , 374–377 (1996). Hung M.H. Removal and
Thermochemical characterization of phenolic resins
Thermogravimetric and pyrolysis-GC studies
Abstract
Phenol-formaldehyde resins (I andII), synthesised at a monomer feed ratio of F/P = 1.0 and 1.5, were cured at 130‡C for 48 h without any catalyst (Ia, IIa), with 0.1% ferric acetyl acetonate (Ib, IIb) and with 0.1 %p-toluenesulphonic acid (Ic, IIc). Thermogravimetric studies indicate that the decomposition of the cured products takes place in two distinct stages: The first stage (T=340–480‡C; α=0.045–0.16; δE 1 = 140±10-239±24 and 60±3–65±2 kJ mol−1 for seriesI andII respectively) was attributed to the predominant cleavage of formal linkages. The main stage decomposition (T=460–640‡C; α=0.114–0.393; δE 2=115±8–169±8 and 91±6–103±7 kJ mol−1 for seriesI andII respectively) was attributed to reactions leading to graphitisation. δE 2 values were correlated to the extent of cure as measured by IR spectroscopy and pyrolysis-GC. The effect of catalysts on the extent of cure and on the activation energy was evaluated.
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., Piližota, V., Hribar, J. & Simčič M. (2009a): Total phenol content and antioxidant activity of water solutions of plant extracts. Croat. J. Fd Sci. Technol. , 1 , 1–7. Simčič M
Introduction Phenol is a chemical product mainly of anthropogenic origin, since in nature it can be found only in the decomposition of organic remains, such as in resins or in wood combustion. The main sources are refineries
