Mechanical properties and thermal stability of rice husk ash filled epoxy foams

Abstract

Mechanical properties and thermal stability of epoxy foams filled with white and black rice husk ash were studied. Epoxy foams were prepared from a commercial system and filled with different amounts of both the ashes (0, 6.8, 12.8, 18.0, and 22.7 wt %). The incorporation of both the ashes modified the final morphology of the foam, decreasing the average cell size and increasing the number of cells per volume unit. For all filler percentages used, the specific modulus and strength results showed that the white ash is more effective as reinforcing agent than the black ash.The initial degradation temperature was not affected by the content and type of ash used as the filler. The integral procedure decomposition temperature, weight loss, and char residue results were related to the ash type and atmosphere used in the thermogravimetric analysis.

Revalorization of rice husk waste as a source of cellulose and silica

“…Data obtained from TGA experiments were transformed in ASCII format and analyzed using a statistics computer program. The initial decomposition temperature (IDT) was measured as the onset of weight loss taken at 1 % [17]. Multiple parameters were calculated from derivative thermogravimetric analysis (DTGA): T sh is the mean value of the range of temperatures of the shoulder located on the left of the main peak; T α the temperature of the maximum of the main peak and T β is the temperature of the maximum of the secondary peak located on the right of the main peak [6].…”

“…On the other hand, the solution rich in silica (SII-In1) was washed with distilled water several times until neutral pH and then it was frozen and lyophilized obtaining a dried powder (SII-In2). Finally the last sample was calcinated in an oven under air atmosphere at 600 o C for 2 h (SII-In3) [17].…”

Effect of SiO2on rheology, morphology, thermal, and mechanical properties of high thermal stable epoxy foam

“…This phenomenon may be explained that the incorporation of SiO 2 into the basic system produces a nucleating effect during foaming process, and increases the number of bubbles per volume unit. 17 This phenomenon is due to the pore structure of epoxy foams as shown in Figures 4 and 5. Interestingly, when the content of SiO 2 is above 5 wt %, the pore morphology with a bimodal size distribution is observed [ Figure 4(f)], which could be explained by qualitative thermodynamic approach.…”

Composites based on sintering rice husk–waste tire rubber mixtures

“…The world production of rice husk was about 122 million tons during the period 2003/2004, which is mainly used for incineration with energy recovery [9] and the production of ashes which are normally applied as filler of polymeric matrices [10][11][12] or as additive for concrete [13]. Other less explored route to revalorize this residue is a replacement of wood in particle boards [14], without any previous treatment.…”