Temperature dependence of the thermal conductivity and thermal diffusivity of treated oil-palm-fiber-reinforced phenolformaldehyde composites

✍ Scribed by Kedar Singh; N. S. Saxena; M. S. Sreekala; S. Thomas

• Publisher: John Wiley and Sons
• Year: 2003
• Tongue: English
• Weight: 102 KB
• Volume: 89
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.12557

✦ Synopsis

Abstract

The effective thermal conductivity (λ~e~) and effective thermal diffusivity (χ~e~) of oil‐palm‐fiber‐reinforced treated composites were measured simultaneously with the transient plane source technique from 50 to 110°C. The fibers of the composites were treated with sodium hydroxide alkali, silanol, and acetic acid. The experimental results for the different treated composites showed that there were variations in λ~e~ and χ~e~ over this temperature range. However, the maximum values of λ~e~ and χ~e~ were observed at 90°C, in the vicinity of the glass‐transition temperatures of these composites. An effort was also made to predict the temperature dependence of λ~e~ and χ~e~ through the development of an empirical model. The theoretically predicted values of λ~e~ and χ~e~ for these composites were in excellent agreement with the experimental results over the entire range of investigated temperatures. Sudden increases in λ~e~ and χ~e~ in the glass‐transition region of these composites were indicative of the fact that the crosslinking density decreased and was at a minimum at the temperature at which λ~e~ and χ~e~ showed their maxima. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 3458–3463, 2003