Figure 4a presents the cross-section of thermoplastic wheat flour film. It conveys that after extrusion a homogeneous phase has been obtained for the polymer. The cross-section of the composites having 20% w/w flax fiber content is given in the Fig. 4b. It can be seen that the fibers are very well dispersed in the matrix. These fibers are oriented along the longitudinal direction of material which corresponds to the direction of extrusion. It is clear from the Fig. 4c that a good wetting had occurred between the fiber and matrix. As a result good fiber/matrix interaction occurs and composites perform superior mechanical properties. The TG and DTG curved for the flax fiber are presented in the Fig. 5. It displays two mass losses. The flax is hydrophilic in nature it can absorb moisture and the first mass loss (equal to 7% w/w) corresponds to the evaporation of the water molecules. This is a general behavior observed in various cellulose based
fibers. This is clear from the DTG curve. Below 2008C, the degradation of fibers is lower even though a slight degradation of lignin and hemicellulose occurs at slow rate. However, at higher temperatures, that is between 200 and 5508C, the degradation rate is faster and a major weight loss occurs because of the degradation of cellulose, hemicellulose, and lignin (Tdonset ¼ 308.88C).
Figure 4a presents the cross-section of thermoplastic wheat flour film. It conveys that after extrusion a homogeneous phase has been obtained for the polymer. The cross-section of the composites having 20% w/w flax fiber content is given in the Fig. 4b. It can be seen that the fibers are very well dispersed in the matrix. These fibers are oriented along the longitudinal direction of material which corresponds to the direction of extrusion. It is clear from the Fig. 4c that a good wetting had occurred between the fiber and matrix. As a result good fiber/matrix interaction occurs and composites perform superior mechanical properties. The TG and DTG curved for the flax fiber are presented in the Fig. 5. It displays two mass losses. The flax is hydrophilic in nature it can absorb moisture and the first mass loss (equal to 7% w/w) corresponds to the evaporation of the water molecules. This is a general behavior observed in various cellulose basedfibers. This is clear from the DTG curve. Below 2008C, the degradation of fibers is lower even though a slight degradation of lignin and hemicellulose occurs at slow rate. However, at higher temperatures, that is between 200 and 5508C, the degradation rate is faster and a major weight loss occurs because of the degradation of cellulose, hemicellulose, and lignin (Tdonset ¼ 308.88C).
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