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In this study, chemically modified walnut shells (WS) were used as the filling material for synthesis of bio‐based epoxy composites and added to the matrix at varied mass ratios (10%–50%). The shells were initially treated with alkali and then modified with three different organic acids (citric acid [CA], oxalic acid [OA], and formic acid [FA]). The WS were characterized by Fourier transform infrared...
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