Abstract
Through the phase-separation system, the functionality controllable lignin-based polymers (lignophenols) with 1, 1-bis (aryl) propane units were synthesized. Ligno-p-cresol with the reactive sites on the Cl-cresolic and the terminal phenolic units were hydroxymethylated (HM) to give network-type polymers by heating. On the other hand, ligno-2, 4-dimethylphenol with reactive sites only on the terminal phenolic units gave linear-type polymers. The polymerization of lignophenols could be controlled by mixing HM-ligno-p-cresol and HM-ligno-2, 4-dimethylphenol. Under alkaline conditions, the resulting polymers were depolymerized effectively to small fragments by the switching function (nucleophilic attack of C1-phenolic nuclei to C2). The recyclable composites with high dimensional stability were prepared by the combination of cellulose and HM-lignophenols. Using the switching function of lignophenols, the composites were re-separated into lignophenols and cellulose.
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