Modification of Poplar Wood via Polyethylene Glycol Impregnation Coupled with Compression

Abstract

Wood permeability and compressibility are affected by cell wall structure and chemical composition. These properties can be improved by appropriate wood pretreatments. Low-density poplar wood was converted to a more dense structure by the following steps: First, lignin and hemicellulose were removed using a mixture of NaOH and Na2SO3. Second they were impregnated with polyethylene glycol (PEG, mean molecular weight of 1200), nano-SiO2, and a silane coupling agent at atmospheric temperature and pressure. Finally, impregnated wood was compressed at 150 °C. Results showed that the tracheid lumens on the transverse section of the compressed wood almost vanished. Specifically, the lumens in the wood cells, especially those that were compressed, were almost completely filled with PEG. In FTIR, the asymmetric absorption peaks of Si–O–Si at 1078–1076 cm−1 were clearly observed, which confirms the existence of bonding between nano-SiO2 and wood. The highest melting enthalpy and crystallization enthalpy showed a heat storage capacity of modified wood, which were 20.7 and 9.8 J/g, respectively. Such phase change capabilities may have potential applications in regulating the rate of change of room temperature. In summary, the modified wood could be utilized as material for construction to conserve energy.

Enhancing ablation and oxidation resistance of phenolic resin with modified pickling asbestos

“…The FT‐IR spectra (Figure S1a) and thermal degradation curves (Figure S1b) of MPA show that PA is successfully grafted, and the modification has little effect on its thermal stability. From the FT‐IR spectra of BPR, PABPR, and MPABPR composites (Figure 1E), it can be observed that the characteristic peak of SiOSi appears in PABPR and MPABPR composites at 950 cm −1 , confirming the successful compounding of PA and MPA with BPR 33 . Meanwhile, the tensile vibration absorption peak of the phenol hydroxyl group also changes near 3200 cm −1 , indicating that there exists a non‐covalent interaction between MPA and matrix.…”

“…From the FT-IR spectra of BPR, PABPR, and MPABPR composites (Figure 1E), it can be observed that the characteristic peak of Si O Si appears in PABPR and MPABPR composites at 950 cm À1 , confirming the successful compounding of PA and MPA with BPR. 33 Meanwhile, the tensile vibration absorption peak of the phenol hydroxyl group also changes near 3200 cm À1 , indicating that there exists a non-covalent interaction between MPA and matrix. In order to further illustrate the interaction between MPA and resin matrix, we fitted the peak infrared spectra of the composite in the range of 3000-3700 cm À1 , and the results are shown in Figure 1F,G and Table S2.…”

Study on aging behavior of polyethylene glycol under three wavelengths of ultraviolet light irradiation

“…3 The PEG2000 studied in this article plays an important role in the eld of cultural relics protection, 4 and it is oen used for dehydration and reinforcement protection of waterlogged wooden cultural relics. 5,6 It is mainly inltrated into the wood cells, and aer the wood is dehydrated; it is lled in the wood cells to strengthen the wood. The repaired wooden cultural relics are easily susceptible to environmental factors such as light, temperature, moisture, oxygen, and chemical media during storage, resulting in changes in the performance and structure of the polyethylene glycol lled in the wooden cultural relics, thus affecting the restoration and long-term preservation of the wooden cultural relics.…”

Study on aging behavior of polyethylene glycol under three wavelengths of ultraviolet light irradiation

“…Polyethylene glycol (PEG) is often used for dehydration and reinforcement protection of waterlogged wooden cultural relics [1][2][3] . It is mainly infiltrated into the wood cells, and after the wood is dehydrated, it is filled in the wood cells to strengthen the wood.…”