A preliminary survey of the interfacial bonding of some tropical hardwoods towards succinic anhydride and 2-octen-1-yl succinic anhydride molecules: Impact of lignin and carbohydrate polymers structure on the chemical reactivity

Safou-Tchiama, Rodrigue; Jeso, B. De; Akagah, Aristide Gervais; Sèbe, Gilles; Pétraud, Michel

doi:10.1016/j.indcrop.2007.03.001

Cited by 21 publications

(11 citation statements)

References 27 publications

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“…The cellulose content listed in Table 1 showed that T. gabonensis displayed the lowest one while that exhibited by A. klaineana's wood (47.9±01.0) was close to that previously published by Savard et al (1960), Lal et al (1977 and Minkuè M'Eny (2000) who found 47.9%, 47.8% and 50.3±0.7% respectively. In addition, the cellulose fibers length we found for A. klaineana was accordingly shorter than its corresponding cellulose-hemicellulose complex studied by Richter and Dallwitz (2000), Medzegue (2007) and Safou-Tchiama et al (2007) who found respective fibers length of 635-1810 m, 820-1160 m and 682 m for unground samples.…”

Section: Discussioncontrasting

confidence: 59%

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Chemical reactivity and supramolecular susceptibility of hardwood celluloses towards succinic anhydride

Safou-Tchiama¹,

Barhé²,

Soulounganga³

et al. 2018

Int. J. Bio. Chem. Sci

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In order to understand the chemical reactivity and the relative susceptibility of I  and I β cellulose allomorphs of some tropical hardwoods with coupling agents bearing succinic moiety, their cellulose fibers were isolated and esterified by succinic anhydride molecule heated at 120 °C for 4 h in dimethylformamide(DMF)/pyridine(Py) used as swelling solvent. The morphological structure of Testulea gabonensis (T. gabonensis), Julbernardia pellegriniana (J. pellegriniana), Aucoumea klaineana (A. klaineana) and Tieghemella africana (T. africana) fibers were characterized by the MORFI® apparatus. The fibers were the longest for T. africana (769 m), J. pellegriniana (717 m) and T. gabonensis (700 m) while those from A. klaineana were the shortest (624 m). No difference was found between T. gabonensis, A. klaineana and T. africana fibers width which varied from 24.0 to 24.2 m while J. pellegriniana cellulose exhibited the smallest width (18.6 m). The cellulose fibers of T. gabonensis, T. africana and J. pellegriniana displayed the better reactivity as revealed by their respective weigh per cent gains: 16.57  1.11%, 14.16  0.67% and 12.96  0.77% compared with A. klaineana (11.85  0.62%). The latter exhibited the lowest decrease of crystallinity among those cellulose esters. Nevertheless, solid state 13 C NMR showed a strong reactivity of amorphous cellulose and chains exposed on crystal surfaces than interior crystallite chains. Any evidence of I  and I  allomorphs esterification was found in those cellulose fibers with the exception of T. africana which displayed a decrease of I  and I  allomorphs without a preferential reactivity of I  cellulose. The trend of heterogeneous phase esterification of cellulose fibers with succinic anhydride in DMF/Py at 120 °C for 4 hours to be merely controlled by amorphous phase and chains exposed on crystal surface was discussed.

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Section: Discussioncontrasting

confidence: 59%

“…To avoid any hydrolysis of ester bonds in the cellulose esters, the samples were not wet. The dry cellulose (1) (2) powder put into a zirconium oxide rotor (4 mm internal diameter), using the cross polarization technique and magic angle spinning (CP/MAS) at 4 and 8 kHz. All the spectra were run for 15 h (25 000 scans).…”

Section: Cp/mas Nmr Characterizationmentioning

confidence: 99%

Chemical reactivity and supramolecular susceptibility of hardwood celluloses towards succinic anhydride

Safou-Tchiama¹,

Barhé²,

Soulounganga³

et al. 2018

Int. J. Bio. Chem. Sci

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“…Acetylation decreased the crystallinity of newspaper fibers. Several researchers showed that the treatment of fiber with anhydride led to a reduction of crystallinity. According to the literature , the reaction between acetic anhydride with cellulose takes place mainly in the amorphous cellulose regions or at the edges of crystalline cellulose regions; the reagents first react with the chain ends on the surface of crystallites, as they cannot diffuse into the crystalline region, resulting in the opening of some of the hydrogen‐bonded cellulose chains.…”

Section: Resultsmentioning

confidence: 99%

Effect of chemical treatment on newspaper fibers reinforced polymer poly(vinyl chloride) composites

Nedjma

Djidjelli

Boukerrou

et al. 2014

Vinyl Additive Technology

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Natural fibers used as reinforcement in composite materials present specific mechanical properties, which are comparable to glass fibers. In addition, they have the advantage of being renewable and recyclable. However, their main drawback is their inherent susceptibility to moisture expansion, which has the effect of inducing a decrease in mechanical properties, and of debonding in the composite. In this study, lignocellulosic fibers from newspapers were modified with acetic anhydride, NaOH, and KMnO 4 in order to enhance the interfacial adhesion between poly(viny lchloride) (PVC) matrix and the newspaper fibers. Composites samples were prepared with different treated fibers at the same loading (20 wt%). X-ray and scanning electron microscopy (SEM) were used to characterize the fiber's surfaces. The mechanical, morphological, and thermal properties of PVC/newspaper composites were also studied. Moreover, the maximum improvement in the mechanical properties (tensile strength) was obtained for the permanganate treated PVC/newspaper composites.

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“…Figure 2 shows the comparison between the 13 C NMR spectra of the SSA (b) and cellulose (a), where we can observe the signs that represent the chemical shifts assigned to six carbon atoms present in a monomer unit of cellulose. Signs related to the parts assigned to the crystalline and amorphous carbon 6 are respectively 64 and 55 ppm, and suggest that the hydroxyl groups of complex carbohydrates have been esterified by succinic anhydride (Safou-Tchiama et al 2007). The signals at 88 and 83 ppm refer to the C4.…”

Section: Characterizationmentioning

confidence: 99%

Sawdust Derivative for Environmental Application: Chemistry, Functionalization and Removal of textile dye from aqueous solution

Pinto

Bezerra

Silva

et al. 2016

An. Acad. Bras. Ciênc.

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The adsorption of Violet Remazol 5R (VR 5) on wood sawdust modified with succinic anhydride (SSA) as a function of contact time, pH, and initial dye concentrations was investigated using a batch technique under ambient conditions. The SSA obtained was confirmed by IR spectroscopy, thermogravimetry and 13 C NMR, and degrees of substitution (DS) were calculated. A study on the effect of the pH on the adsorption of VR 5 showed that the optimum pH was 2.0. The interactions were assayed with respect to the pseudofirst-order and pseudo-second-order kinetic models, and were found to follow closely the pseudo-secondorder. The isotherm was adjusted to the Langmuir, the Freundlich and the Temkin sorption models. SSA is a promising material for the removal of dye textile from aqueous solutions, and under conditions studied the removal percentage achieved was 51.7%.

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A preliminary survey of the interfacial bonding of some tropical hardwoods towards succinic anhydride and 2-octen-1-yl succinic anhydride molecules: Impact of lignin and carbohydrate polymers structure on the chemical reactivity

Cited by 21 publications

References 27 publications

Chemical reactivity and supramolecular susceptibility of hardwood celluloses towards succinic anhydride

Chemical reactivity and supramolecular susceptibility of hardwood celluloses towards succinic anhydride

Effect of chemical treatment on newspaper fibers reinforced polymer poly(vinyl chloride) composites

Sawdust Derivative for Environmental Application: Chemistry, Functionalization and Removal of textile dye from aqueous solution

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