Lignin demethylation for modifying halloysite nanotubes towards robust phenolic foams with excellent thermal insulation and flame retardancy

Li, Ming; Shan, Junqiang; Hu, Youqin; Gao, Cheng; Long, Haoyu; Shen, Tao; Tan, Zhuotao; Zhuang, Wei; Liu, Dong; Zhu, Chenjie

doi:10.1002/app.52019

Cited by 12 publications

(5 citation statements)

References 38 publications

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“…[44] Lignin prepared by this method is a suitable substitute for phenol in ligninbased PF resin adhesives. Demethylation can be performed using various methods with different catalysts, such as SO 3 2À (Scheme 3a), [45] HBr (Scheme 3b), [46] and a combination of 1dodecanethiol, hydroiodic acid, and iodocyclohexane (Scheme 3c). [47] The specific method used depends on the lignin type and desired properties of the modified lignin when considered as a substitute for the preparation of PF resin adhesives.…”

Section: Demethylation Modification Of Ligninmentioning

confidence: 99%

“…[45] Copyright (2016), with permission from RSC Publishing; (b) HBr, reproduced from Ref. [46] Copyright (2021), with permission from John Wiley and Sons; (c) combination of 1-dodecanethiol, hydroiodic acid, and iodocyclohexane, reproduced from Ref. [47] Copyright (2017), with permission from American Chemical Society.…”

Section: Phenolation Modification Of Ligninmentioning

confidence: 99%

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Advances of Modified Lignin as Substitute to Develop Lignin‐Based Phenol‐Formaldehyde Resin Adhesives

Peng,

Jiang,

et al. 2023

ChemSusChem

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Traditionally, phenols used to prepare phenol‐formaldehyde (PF) resin adhesives are obtained from phenolic compounds and various chemicals, which are extracted from petroleum‐based raw materials. Lignin, a sustainable phenolic macromolecule in the cell wall of biomass with an aromatic ring and a phenolic hydroxyl group similar to those of phenol, can be an ideal substitute for phenol in PF resin adhesives. However, only a few lignin‐based adhesives are produced on a large scale in industry, mainly because of the low activity of lignin. Preparing lignin‐based PF resin adhesives with exceptional achievements by modifying lignin instead of phenol is an efficient method to improve the economic benefits and protect the environment. In this review, the latest progress in the preparation of PF resin adhesives via lignin modification, including chemical, physical, and biological modifications, is discussed. In addition, the advantages and disadvantages of different lignin modification methods for adhesives are compared and discussed, and future research directions for the synthesis of lignin‐based PF resin adhesives are proposed.

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Section: Demethylation Modification Of Ligninmentioning

confidence: 99%

Section: Phenolation Modification Of Ligninmentioning

confidence: 99%

Advances of Modified Lignin as Substitute to Develop Lignin‐Based Phenol‐Formaldehyde Resin Adhesives

Peng,

Jiang,

et al. 2023

ChemSusChem

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“…Lignin demethylation over halogen acids (HI, HBr) is also used to increase the hydroxyl content of lignin with the intent to improve lignin reactivity. [134][135][136] Wang et al used HBr and HI as the nucleophilic reagents for lignin demethylation. The results showed that the molar amounts of phenolic hydroxyls increased to 0.67 mmol g −1 for the HI-DL (demethylated lignin), and 0.64 mmol g −1 for the HBr-DL, from 0.52 mmol g −1 for the initial lignin.…”

Section: Synthesis Of Lpr From Modified Ligninmentioning

confidence: 99%

Lignin as a green and multifunctional alternative to phenol for resin synthesis

Sun

Wang

et al. 2023

Green Chem.

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“…Li et al [192] produced BPF foams using demethylated lignin (DL) modified with halloysite nanotubes (HNTs). Initially, lignin was demethylated in the presence of HBr and other solvents in a microwave reactor at 90 °C for 90 min.…”

Section: Synthesis Of Biobased Phenol Formaldehyde Foamsmentioning

confidence: 99%

“…4) via high-speed mechanical stirrer. The resulting mixture was kept at 80 °C for 75 min to cure to obtain the final foam [192].…”

Section: Synthesis Of Biobased Phenol Formaldehyde Foamsmentioning

confidence: 99%

Recent Developments in Biobased Foams and Foam Composites for Construction Applications

DSouza,

Ng,

Charpentier

et al. 2023

ChemBioEng Reviews

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A surge of research into renewable foams has yielded an array of high‐performance polymeric materials, many of which exhibit promising properties for next generation thermal insulating materials. Biobased materials are of particular interest, due to growing concerns towards enhancing the circular economy while reducing fossil fuel dependency in the construction industry. This review outlines recent developments in biobased foams based on biobased polyurethanes (BPU), biobased phenol formaldehyde (BPF) and cellulose nanofibers (CNF) foams. These three areas of polymers are of particular interest due to their early stage of market adoption, yet significant industrial potential. As our focus is on construction materials, we will review their thermal, mechanical, and fire‐retardant performance, their synthesis/fabrication methods and future prospects. Improving the scalability, reproducibility and cost‐effectiveness of their production is vital for successful commercialization adoption.

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Lignin demethylation for modifying halloysite nanotubes towards robust phenolic foams with excellent thermal insulation and flame retardancy

Cited by 12 publications

References 38 publications

Advances of Modified Lignin as Substitute to Develop Lignin‐Based Phenol‐Formaldehyde Resin Adhesives

Advances of Modified Lignin as Substitute to Develop Lignin‐Based Phenol‐Formaldehyde Resin Adhesives

Lignin as a green and multifunctional alternative to phenol for resin synthesis

Recent Developments in Biobased Foams and Foam Composites for Construction Applications

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