SEM was performed with a field emission scanning electron microanalyzer (Zeiss Supra 40). All samples were gold-sputtered for 50 s at a constant current of 30 mA before observation. TEM was performed on H-7650 (Hitachi) operating at an acceleration voltage of 100 kV. The x-ray microtomography was conducted on Y.Cheetah (YXLON) for the 3D microstructural information. The raw data were reconstructed using the software VGStudio MAX 2.2 by assembling the static images in sequence. The skeletal densities of CPF and CMF were 1.3 ± 0.1 and 1 ± 0.1 g cm−3, respectively, according to the pycnometer method. The in-site observation of the compressive process of polymeric woods was recorded with a monocular microscope (JT-1400B). The thermal conductivity was measured using the transient plane source technique. The vertical test was performed on a CFZ-2 type instrument (Jiangning Analysis Instrument Co.) according to the UL 94 test standard. The specimens used were of dimensions 130 mm × 13 mm × 3 mm. LOI was measured according to ASTM D2863. The apparatus used was an HC-2 oxygen index meter (Jiangning Analysis Instrument Co.). The specimens used for the test were of dimensions 100 mm × 6.5 mm × 3 mm.

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