Preparation of modified hydrolysis lignin and its use for filling epoxy polymers and enhancing their flame resistance

Alalykin, A. A.; Vesnin, R. L.; Kozulin, Denis A.

doi:10.1134/s1070427211090278

Cited by 25 publications

(14 citation statements)

References 2 publications

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“…Moreover, its aromatic chemical leads to a high char yield after decomposition (around 40% at 900°C). 31 Various lignins (raw and chemically modified) were recently incorporated in various flame retardant systems for biobased polymers and biobased composites, [32][33][34][35] In the present study, combinations of nanoclays, lignin and APP at micronic scale, will be proposed to try to combine the interest of the formation of metallic phosphates and charring activity on PBS fire retardancy. New developments aiming to use lignin at nanometric scale in flame retardant systems are also in progress and will be detailed in a next article.…”

Section: Marney Et Almentioning

confidence: 99%

“…Moreover, its aromatic chemical leads to a high char yield after decomposition (around 40% at 900°C) . Various lignins (raw and chemically modified) were recently incorporated in various flame retardant systems for biobased polymers and biobased composites, including PBS since the pioneering work of De Chirico et al who incorporated lignin with APP in PP. Owing to the nature of the chemical groups linked to their aromatic structures, lignins can be dehydrated by polyacids such as APP and hence can be integrated in intumescent flame retardant systems.…”

Section: Introductionmentioning

confidence: 99%

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Thermal stability and fire reaction of poly(butylene succinate) nanocomposites using natural clays and FR additives

Dumazert

Rasselet

Pang

et al. 2017

Polymers for Advanced Techs

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Section: Marney Et Almentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal stability and fire reaction of poly(butylene succinate) nanocomposites using natural clays and FR additives

Dumazert

Rasselet

Pang

et al. 2017

Polymers for Advanced Techs

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“…The amount of hydroxyl groups in the initial THL was established from the data given in [4] (Table 1). Reactivity of OH-groups in THL depends not only on their amount in the initial sample but also on spatial organization of the THL macromolecule.…”

Section: Resultsmentioning

confidence: 99%

Mechanism of Interaction Between Hydrolytic Lignin and Poly(acrylonitrile)

Sazanov

Krutov

Ipatova

et al. 2017

Eurasian Chem. Tech. J.

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Interaction between polyacrylonitrile (PAN) and hydrolytic lignin (THL) in mixed binary solution dimethyl sulfoxide/water (70:30) allowed us to obtain homogeneous forming solution of the THL/PAN composite. This forming solution was used for preparation of fibers and films which served as precursors for carbon materials. In the present work, we considered and substantiated the proposed mechanism of the formation of the THL/PAN composite based on the structure of the initial polymers. We believe that interaction between reactive groups present in PAN and THL leads to the formation of graft copolymer. Fundamentally, this reaction is possible and may proceed according to the wellknown Ritter mechanism It was demonstrated that the process of grafting nitrile groups to THL macromolecules is controlled by duration and temperature of interaction between the initial compounds in solution; this process is completed in 10 h at a temperature of 120 °C. Tentative calculation shows that for each statistically averaged PAN macromolecule there are five THL molecules with activated hydroxyl groups. These forming solutions are suitable for moulding fibers which serve as precursors for carbon fibrous materials.

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“…Lignin phosphorylation has been carried out under different conditions using various phosphorus reagents, such as phosphorus trihalides, phosphorus oxyhalides, phosphorus thiohalides, phosphorus oxides, and phosphorus sulfides, for instance. [44][45][46][47] Tetrahydrofuran, 38,48 pyridine, 39,49 acetonitrile, 47 dimethylformamide, formaldehyde 44,45 and urea 37 were also used as solvents for phosphorylation in different studies. The reaction conditions were reported to occur in the time range of 1-12 h and the temperature range of 25-180°C.…”

Section: Introductionmentioning

confidence: 99%

“…38,47,49,50 The phosphorylated group on lignin has facilitated its use as a high-performance flame-retardant additive in polyurethane, polybutylene succinate, polypropylene, epoxy and polylactic acid. 39,[44][45][46][47] The proposed application is attributed to the fact that the phosphorylation of aromatic compounds Fig. 1 General S N 2 reaction mechanism between lignin and substrate to form a new product and a leaving group (L).…”

Section: Introductionmentioning

confidence: 99%

Grafting strategies for hydroxy groups of lignin for producing materials

2019

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Lignin is one of the most abundant biopolymers on Earth and is considered as the primary resource of aromatic compounds. Recently, lignin has attracted attention from scientists and industrialists due to its inherent potential arising from its unique structure, which leads to its possible use in many applications.Many efforts have been made to ameliorate the reactivity and compatibility of lignin in different areas. Although methods have been proposed for endowing lignin with different properties, there continues to be a considerable demand for discovering new and effective ways of unraveling the beneficial uses of this aromatic polymer. Considering the structure of lignin, different grafting modifications can occur on the aliphatic and/or aromatic groups of lignin. To date, there has been a lack of fundamental understanding of the modification pathways of lignin for generating lignin-based products. In this review paper, we discuss comprehensively the chemical reactions that were introduced in the literature for preparing lignin with different features via modifying its phenolic and aliphatic hydroxy groups for altered uses. This review paper critically and comprehensively elaborates on the recent progress in lignin reactions as well as the challenges, advantages and disadvantages associated with the reaction procedures and the product development processes. Furthermore, the research gap in reaction strategies and product development are described throughout this study.

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Preparation of modified hydrolysis lignin and its use for filling epoxy polymers and enhancing their flame resistance

Cited by 25 publications

References 2 publications

Thermal stability and fire reaction of poly(butylene succinate) nanocomposites using natural clays and FR additives

Thermal stability and fire reaction of poly(butylene succinate) nanocomposites using natural clays and FR additives

Mechanism of Interaction Between Hydrolytic Lignin and Poly(acrylonitrile)

Grafting strategies for hydroxy groups of lignin for producing materials

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