Effect of the temperature of the heat treatment of pine wood on subsequent in situ polymerization with poly(methyl methacrylate)

The objective of this study was to evaluate a two‐step Pinus elliottii modification process comprising thermal treatment at different temperatures (180 °C, 200 °C, or 220 °C) for 2 h followed by vacuum‐pressure treatment and in situ polymerization with a highly pure solution of poly (methyl methacrylate) (PMMA). The treated samples were then characterized based on weight loss, weight gain, density, Fourier transform infrared spectroscopy, chemical constituents, thermal stability, dimensional stability, surface hydrophobicity, morphology, color changes, and mechanical properties. Thermal modification prior to impregnation increased thermal stability (~100%–150%) in comparison with heat‐treated pine wood. Furthermore, after the two‐step treatment, the color presented similar patterns and a lower level of water uptake (~40%–60%). Post‐treatment with PMMA recovered the losses in both stiffness and strength brought by thermal modification at 180 °C and 200 °C; however, the treatment at 220 °C was found to be unsuitable for the two‐step process. © 2022 Society of Chemical Industry and John Wiley & Sons, Ltd.

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