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Several lignin‐based activated carbon fibers (ACFs) were prepared by initial synthesis of lignin–phenol–formaldehyde (LPF) resins with varied lignin contents, 8–20%, respectively, and then the melt spinning and thermal treatments. Because the guaiacyl groups of lignin reacted with the formaldehyde, the role of lignin played becomes a dominator for controlling the thermal properties of LPF resin and...
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