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Dissolution of fir powder and its graft copolymer in ionic liquid

Auflösung von Tannenholzmehl und dessen Pfropfcopolymer in ionischer Flüssigkeit

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Abstract

Ionic liquid of 1-(2-hydroxylethyl)-3-ethyl imidazolium chloride ([HeEIM]Cl) was synthesized and its chemical structure was examined by FTIR and 1HNMR. Dissolution of the fir powder which was activated with 25% NaOH under different conditions in the ionic liquid was studied. Acrylamide (AM) was grafted onto the dissolved fir powder in [HeEIM]Cl and aqueous medium, respectively. Technologic conditions for graft copolymerization were optimized by orthogonal test. The results showed that the ionic liquid exhibited good solubility for the fir powder, the dissolution rate was as high as 18.3%. The graft copolymer prepared in [HeEIM]Cl had higher grafting degree and grafting efficiency than in aqueous medium. The most suitable conditions for graft copolymerization were: mass fraction of AM 25%, fluid ratio of [HeEIM]Cl to wood 30:1, and mass proportion of wood to AM 1:4. FTIR and SEM suggested that AM had been grafted onto the fir powder. XRD and TG indicated that the crystalline structure of the wood fiber had been destroyed thoroughly after being grafted, and the thermal stability of graft copolymer had been improved.

Zusammenfassung

Die ionische Flüssigkeit 1-(2-Hydroxyethyl)-3-ethyl-imidazolchlorid ([HeEIM]Cl) wurde synthetisiert und ihre chemische Struktur wurde mittels FTIR und 1HNMR überprüft. Die Auflösung von Tannenholzmehl, das mit 25 % NaOH unter unterschiedlichen Bedingungen aktiviert worden war, wurde in ionischer Flüssigkeit untersucht. Acrylamid (AM) wurde auf das aufgelöste Tannenholzmehl in [HeEIM]Cl sowie in einem wässrigen Medium aufgepfropft. Mittels orthogonaler Versuche wurden die technologischen Bedingungen der Pfropfcopolymerisation optimiert. Die Ergebnisse zeigten, dass die ionische Flüssigkeit für die Auflösung von Tannenholzmehl gut geeignet war. Die Auflösungsrate betrug bis zu 18,3 %. Das in [HeEIM]Cl hergestellte Pfropfcopolymer wies einen höheren Pfropfgrad und eine höhere Pfropfeffizienz auf als dasjenige, das in wässrigem Medium hergestellt worden war. Die am besten geeigneten Bedingungen einer Propfcopolymerisation ergaben sich bei einem Massenanteil von AM von 25 %, einem Flüssigkeitsverhältnis von [HeEIM]Cl zu Holz von 30:1 und einem Massenverhältnis von Holz zu AM von 1:4. FTIR- und REM-Untersuchungen lassen darauf schließen, dass AM auf das Tannenholzmehl gepfropft wurde. Röntgendiffraktometrie (XRD) und thermogravimetrische Analyse (TG) zeigten, dass die kristalline Struktur der Holzfaser nach der Pfropfung vollkommen zerstört worden war und sich die Wärmebeständigkeit des Pfropfcopolymers verbessert hatte.

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Acknowledgements

The authors gratefully acknowledge the support of the National Natural Science Foundation of China (NSFC) (Grant No.50773017).

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Authors and Affiliations

  1. School of Chemical Engineering, Hefei University of Technology, Tunxi Road No. 193, Hefei, Anhui, 230009, P.R. China

    Liying Guo, Tiejun Shi & Zhong Li

  2. School of Petrochemical Engineering, Shenyang University of Technology, Guanghua Street No. 30, Liaoyang, Liaoning, 111003, P.R. China

    Liying Guo

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  1. Liying Guo
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  2. Tiejun Shi
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Correspondence to Tiejun Shi.

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Guo, L., Shi, T. & Li, Z. Dissolution of fir powder and its graft copolymer in ionic liquid. Eur. J. Wood Prod. 69, 383–389 (2011). https://doi.org/10.1007/s00107-010-0438-6

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  • DOI: https://doi.org/10.1007/s00107-010-0438-6

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