ESR studies of radicals generated by ultrasonic irradiation of lignin solution. An application of the spin trapping method

Seino, Teruyuki; Yoshioka, Aki; Fujiwara, Mai; Chen, K.-L.; Erata, Tomoki; Tabata, M.; Takai, Mitsuo

doi:10.1007/s002260000080

Cited by 33 publications

(15 citation statements)

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“…The (2,4,6-tri-tert-butylbenzyl)-(2,6-diethyl-4,8-dimethyl-hydro-s-indacenyl)nitroxide radical N Å formed (Scheme 4) (g = 2.0062, a Hb = 13.93G, d; a N = 11.82G, 1.1.1. t.; a Har = 0.90, 1.2.1. t) was identified from its characteristic H b -N coupling [34,41,42] (Fig. 4).…”

Section: O [39] (Eq (3) In Chart 3) In Order To Trap Intermediate Cmentioning

confidence: 99%

From polysubstituted 1,5-dihydro-s-indacene lithium derivatives to polysubstituted hydro-s-indacenyl radicals by a new method involving a single electron transfer from an electron rich olefin

Katir

Rivière

Rivière-Baudet

et al. 2010

Inorganica Chimica Acta

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Section: O [39] (Eq (3) In Chart 3) In Order To Trap Intermediate Cmentioning

confidence: 99%

From polysubstituted 1,5-dihydro-s-indacene lithium derivatives to polysubstituted hydro-s-indacenyl radicals by a new method involving a single electron transfer from an electron rich olefin

Katir

Rivière

Rivière-Baudet

et al. 2010

Inorganica Chimica Acta

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“…Ultrasound energy was used to increase lignin extraction yield and purity or to remove the major inorganic load from the alkali lignin with no significant modifications observed in the properties (composition, structure; at 20 kH, 100 W) of the isolated lignin samples [18][19][20] or to polymerization for high molecular weight lignin [21]. Seino et al [22] claim that the b-O-4 majority [23,24] bonds of lignin can be homolytically cleaved to some extent by sonication.…”

Section: Introductionmentioning

confidence: 99%

Obtaining lignin nanoparticles by sonication

Gilca

Popa

Crestini

2015

Ultrasonics Sonochemistry

241

139

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a b s t r a c tLignin, the main natural aromatic polymer was always aroused researchers interest. Currently around 90% of this biomaterial is burned for energy. It has a very complex and complicated structure which depends on the separation method and plant species, what determine difficulties to use as a raw material widely. This research presents a physical method to modify lignin by ultrasonic irradiation in order to obtain nanoparticles. The nanoparticles synthesized were dimensionally and morphologically characterized. At the same time the preoccupations were to determine the structural and compositional changes that occurred after sonication. To achieve this, two types of commercial lignins (wheat straw and Sarkanda grass) were used and the modifications were analyzed by FTIR-spectroscopy, GPC-chromatography, 31 P-NMR-spectroscopy and HSQC0. The results confirm that the compositional and structural changes of nanoparticles obtained are not significantly modified at the intensity applied but depend on the nature of lignin.

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“…Based on these recent results, it is evident that no demonstrations of polymer‐based nanocomposites reinforced with NL obtained by ultrasonic treatment have been reported to date, notwithstanding the great potential of this approach in view of the development of more environmentally sustainable lignin treatment processes. Indeed, the few reports on ultrasonication of lignin mainly focused on the characterization of the effects of this treatment on the chemical, physical, and morphological properties of lignin, with no detailed investigation on the use of such ultrasonically treated lignin nanoparticles in nanocomposite systems.…”

Section: Introductionmentioning

confidence: 99%

Lignin nanoparticles by ultrasonication and their incorporation in waterborne polymer nanocomposites

González

Levi

Turri

et al. 2017

J of Applied Polymer Sci

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Lignin nanoparticles (nanolignin, NL) were prepared in this work by ultrasonic treatment of softwood kraft lignin to obtain lignin‐water dispersions with excellent colloidal stability. A thorough characterization of the chemical, physical, and morphological properties of the new NL particles allowed for direct comparisons with the untreated parent material. Such NL particles were incorporated into a waterborne thermoplastic polyurethane matrix at different concentrations to yield bio‐based nanocomposite materials. The effect of the bio‐filler type (NL vs. untreated lignin) and loading on the chemical, physical, thermal, and morphological characteristics of the resulting nanocomposites was extensively investigated. In addition, tensile tests carried out on these systems highlighted the superior mechanical properties of NL‐based nanocomposites compared to composite materials incorporating untreated lignin. The results of this study provide a direct demonstration of an easy and environmentally friendly approach to obtain waterborne polyurethane‐based nanocomposites reinforced with NL in a relatively straightforward and accessible way and clearly evidence the potential of lignin nanoparticles as fully bioderived fillers for advanced nanocomposite applications. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45318.

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ESR studies of radicals generated by ultrasonic irradiation of lignin solution. An application of the spin trapping method

Cited by 33 publications

References 0 publications

From polysubstituted 1,5-dihydro-s-indacene lithium derivatives to polysubstituted hydro-s-indacenyl radicals by a new method involving a single electron transfer from an electron rich olefin

From polysubstituted 1,5-dihydro-s-indacene lithium derivatives to polysubstituted hydro-s-indacenyl radicals by a new method involving a single electron transfer from an electron rich olefin

Obtaining lignin nanoparticles by sonication

Lignin nanoparticles by ultrasonication and their incorporation in waterborne polymer nanocomposites

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