Usage of Pulp and Paper Secondary Sludge for Biocomposite Production: FTIR and DSC Analysis
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Abstract
This work studies the potential of secondary sludge from pulp and paper mills to be used as raw material for biocomposite production. To this end, a secondary sludge sample is characterized through different techniques including Fourier Transform Infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). Furthermore, the cellular biopolymers of the secondary sludge are extracted and characterized. The results indicate the presence of a considerable amount of lignocellulosic substances along with cellular biopolymers in the secondary sludge. These biopolymers may be used in biocomposites as reinforcement as well as part of the polymeric matrix. Moreover, amine and amide groups identified in the extracted biopolymers, when mixed with commercial polymeric resins, can serve as molecular anchors. The thermal analysis shows that the extracted cellular biopolymers act as a homogeneous blend of polymers. This test also reveals the thermosetting nature of the extracted biopolymers resulting in the loss of their properties after being heated once. The presented results suggest that secondary sludge from pulp and paper mills may have potential applications in biocomposite production as reinforcement along with thermosetting polymeric matrices.
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