Improvement of decay resistance of wood via combination treatment on wood cell wall: Swell-bonding with maleic anhydride and graft copolymerization with glycidyl methacrylate and methyl methacrylate

Li, Yongfeng; Dong, Xiaoying; Liu, Yixing; Li, Jian; Wang, Fenghu

doi:10.1016/j.ibiod.2011.08.009

Cited by 77 publications

(48 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…However, these properties can be enhanced through formation of composites. Woodpolymer composites (WPC), prepared by the impregnation of vinyl monomers followed by in situ polymerization by either γ-radiation or catalyst heat treatment, generally exhibit enhanced strength, improved thermal properties and dimensional stability, and resistance to biodeterioration [1][2][3][4] . Impregnation of woods with vinyl or acrylic monomers shows less dimensional stability in the presence of moisture 5 .…”

Section: Introductionmentioning

confidence: 99%

In situ polymerized wood polymer composite: effect of additives and nanoclay on the thermal, mechanical properties

Devi

Maji

2013

Mat. Res.

View full text Add to dashboard Cite

This study concerns the preparation and characterization of wood polymer nanocomposites based on impregnation of styrene acrylonitrile co-polymer-nanoclay intercalating system in presence of glycidyl methacrylate (GMA), a cross linking agent, and vinyl trichloro silane (VTCS) as additives into Simul (Bombex ceiba, L.), a soft wood. The effect of nanoclay and VTCS on the properties of the resultant wood polymer nanocomposites (WPNC) has been evaluated. FTIR spectroscopy shows the interaction among wood, polymers, GMA, nanoclay and VTCS. The penetration of polymer and nanoclay into the wood cell wall is supported by SEM study. The distribution of nanoclay in the SAN polymer matrix present within the wood cell wall has been evidenced by TEM study. TGA results show an improvement in the thermostability of the resultant composites. The inclusion of VTCS enhances the self extinguishing behaviour of the WPNC as revealed by limiting oxygen index (LOI) test. Due to treatment, the resultant WPNC exhibits an improvement in all the properties like water repellancy, dimensional stability, hardness, flexural, tensile and thermal stability compared to untreated wood.

show abstract

Section: Introductionmentioning

confidence: 99%

In situ polymerized wood polymer composite: effect of additives and nanoclay on the thermal, mechanical properties

Devi

Maji

2013

Mat. Res.

View full text Add to dashboard Cite

show abstract

“…O preenchimento parcial dos vasos e poros da madeira de guapuruvu, nos compósitos M:G e M:A, ocorreu pela penetração de moléculas polares do GMA e MAA no interior da parede celular, o que só é possível devido à reatividade entre o grupo carboxílico do MAA e o anel epóxi do GMA com os grupos OH da madeira. A penetração de polímeros na parede celular acarreta, normalmente, em incrementos mais significativos nas propriedades da madeira [11] .…”

Section: Morfologia Dos Compósitosunclassified

“…Essa pequena modificação deu-se pela conversão parcial dos grupos hidroxila em novos grupos éter e o aparecimento de novas estruturas OH oriundas dos copolímeros [11,12] . Nos compósitos M:A e M:G, para ambas frações, observou-se uma diminuição significativa da razão I 3352/1050 , o que indicou substituição parcial dos grupos OH da madeira durante a reticulação oriunda da reação de copolimerização.…”

Section: Figura 2 Espectros De Atr-ir Para Os Polímeros (A) Madeiraunclassified

“…A aplicação de ácido metacrílico (MAA) como agente reticulante de cadeia polimérica e de ligação ainda não foi testada com o objetivo de promover um copolímero reticulado e grafitado na parede celular da madeira. Por outo lado, o glicidil metacrilato (GMA) já foi utilizado para este propósito e mostrou bons resultados [10][11][12] . A inserção de novos aditivos em compósitos polímero-madeira deve ser estudada, entretanto um comparativo com aditivos já conhecidos é interessante para avaliar a aplicabilidade das novas formulações.…”

Section: Introductionunclassified

See 1 more Smart Citation

Compósitos polímero-madeira preparados por polimerização in situ de metil metacrilato usando aditivos bifuncionais

et al. 2015

View full text Add to dashboard Cite

ResumoO presente trabalho teve por objetivo a confecção de compósitos polímero-madeira por meio de polimerização in situ de metil metacrilato (MMA), utilizando ácido metacrílico (MAA) e glicidil metacrilato (GMA) como agentes de ligação e reticulação. Amostras de madeira de guapuruvu foram impregnadas em um sistema de vácuo e pressão e polimerizadas em estufa a 90°C por 10h, usando 1,5% de peroxido de benzoíla como catalisador. Os compósitos foram caracterizados por meio de testes de absorção de água e estabilidade dimensional, molhabilidade, ATR-IR, TGA, MEV e WPG. Os espectros de ATR-IR mostraram incrementos nas bandas a 1746, 1460, e 1145 cm -1 , referentes as estruturas químicas dos polímeros dentro da madeira, confirmado posteriormente pelas imagens de MEV. A termogravimetria apontou reações químicas entre os copolímeros e a parede celular da madeira nos compósitos com GMA e MAA. Os compósitos preparados com MMA apresentaram incrementos acima de 50% nas propriedades higroscópicas e de estabilidade dimensional, entretanto a adição de GMA e MAA resultou em maiores incrementos nas mesmas propriedades, entre 66-90%. Palavras-chave: polimerização por radicais livres, Schizolobium parahyba, catálise térmica, reticulantes, agentes de ligação. AbstractWe prepared wood/polymer composites by in situ polymerization of methyl methacrylate (MMA) using glycidyl methacrylate (GMA) and methacrylic acid (MAA) as cross-linkers and coupling agents. The guapuruvu wood samples were impregnated in a vacuum/pressure system and polymerized at 90 °C for 10 h, using benzoyl peroxide at 1.5 wt % as catalyst. We characterized the composites through water uptake, dimensional stability tests, wettability, ATR-FTIR spectroscopy, TGA, SEM, and WPG. ATR-FTIR spectra showed an increase of the peaks at 1746, 1460, and 1145 cm -1 , corresponding to the chemical structures of the polymers into the pores and capillaries of the wood. This was further confirmed in the SEM images. TGA curves showed evidences for a chemical interaction between the copolymer and the wood cell wall in the composites with GMA and MAA. Hygroscopicity and dimensional stability properties of the composites prepared with MMA improved by 50%. Nevertheless, the addition of GMA and MAA resulted in additional increases for hydrophobicity and dimensional stability of the samples, ~ 66 -90%.

show abstract

“…However, slicewood or veneers have some undesirable properties such as dimensional instability, photodegradation, combustibility, and susceptibility to biological degradation. These serve to limit their exterior applications and long-term utilization (Saka and Ueno 1997;Li et al 2011). Therefore, one unprecedented challenge stands on how to overcome these disadvantageous characteristics.…”

Section: Introductionmentioning

confidence: 99%

Comparisons and Characteristics of Slicewood Acetylation with Acetic Anhydride by Liquid Phase, Microwave, and Vapor Phase Reactions

Yang¹,

Hung²,

Wu³

et al. 2014

BioResources

View full text Add to dashboard Cite

This study compared and characterized slicewood acetylation with acetic anhydride using conventional liquid phase, microwave, and vapor phase reactions. The results revealed that there were no significant differences in the flexural properties between the unmodified and acetylated slicewood, regardless of the reaction method used. Furthermore, findings concluded that the slicewood acetylated with a vapor phase reaction required less modifying agent to achieve high levels of weight percent gain (WPG). The correlations between the anti-swelling efficiency (ASE) and the WPG of the slicewood acetylated with a vapor phase reaction were higher than the conventional liquid phase and microwave reactions. The reactivity of the cellulose hydroxyl groups was sensitive to the C2 and C6 reactive sites for all three acetylation methods. However, the reactivity was more pronounced at the C2 position with a vapor phase reaction compared to the other two reactions. Nevertheless, slicewood acetylation with acetic anhydride was found to not have a significant influence on viscoelastic properties for any of the different reaction methods.

show abstract

Improvement of decay resistance of wood via combination treatment on wood cell wall: Swell-bonding with maleic anhydride and graft copolymerization with glycidyl methacrylate and methyl methacrylate

Cited by 77 publications

References 34 publications

In situ polymerized wood polymer composite: effect of additives and nanoclay on the thermal, mechanical properties

In situ polymerized wood polymer composite: effect of additives and nanoclay on the thermal, mechanical properties

Compósitos polímero-madeira preparados por polimerização in situ de metil metacrilato usando aditivos bifuncionais

Comparisons and Characteristics of Slicewood Acetylation with Acetic Anhydride by Liquid Phase, Microwave, and Vapor Phase Reactions

Contact Info

Product

Resources

About