Rapid homogeneous esterification of cellulose induced by microwave irradiation

Satgé, Céline; Verneuil, Bernard; Branland, Pierre; Granet, Robert; Krausz, Pierre; Rozier, J; Petit, Christophe

doi:10.1016/s0144-8617(02)00004-8

Cited by 90 publications

(39 citation statements)

References 10 publications

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“…Cellulose, being the most abundant natural polysaccharide, is also attracting a huge attention and indeed several examples of its chemical modification can be found in literature. Microwave heating was employed for the synthesis of common cellulose derivatives like esters (Satgé et al, 2002) and carbammates (Guo et al, 2009) as well as for the graft copolymerization of methyl methacrylate initiated with ceric amonium nitrate (Wan et al, 2011). Guar Gum is an edible galactomannan isolated from a legume native of the northwestern India and finds wide application as water thickener due to the ability of forming highly viscous colloidal dispersions.…”

Section: Grafting and Chemical Modification Of Natural Polymersmentioning

confidence: 99%

Synthesis and processing of biodegradable and bio-based polymers by microwave irradiation

Frediani¹,

Giachi²,

Rosi³

et al. 2011

Microwave Heating

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Section: Grafting and Chemical Modification Of Natural Polymersmentioning

confidence: 99%

Synthesis and processing of biodegradable and bio-based polymers by microwave irradiation

Frediani¹,

Giachi²,

Rosi³

et al. 2011

Microwave Heating

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“…They are utilized as plasticizers, lubricants, as a component of perfumes, cosmetics, pharmaceuticals, food preservatives or intermediate compounds for the synthesis of drugs, fine chemicals or others [11][12][13][14][15][16]. The solventfree, microwave-assisted synthesis of many types of ester compounds during direct esterification or transesterification methods have been reported [17][18][19][20][21][22][23][24]. However, little information regarding the microwave-assisted synthesis of flavor esters derivatives of monoterpene compounds such as geraniol, nerol or citronellol have been described.…”

Section: Introductionmentioning

confidence: 99%

Thermal properties of neryl long-chain esters obtained under microwave irradiation

Worzakowska

2015

J Therm Anal Calorim

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Thermal properties of novel, neryl long-chain esters obtained through the esterification process of nerol, different chain lengths acidic components such as succinic anhydride, glutaric anhydride, adipic acid or sebacic acid and diol components such as ethylene glycol or diethylene glycol in solvent-free conditions under microwave irradiation were studied by TG/FTIR-coupled method. The studies confirmed that the use of microwave irradiation allowed obtaining flavor esters in absolutely shorter reaction time (only minutes) with high purity and yield compared to conventional method. The prepared novel, neryl long-chain esters were high thermal stable compounds and decomposed at three stages under air conditions including the breaking of ester bonds, oxidation and decarboxylation processes of formed intermediate products in a gaseous phase and thus the emission of various gaseous products. It was indicated on the same, complex and parallel decomposition mechanism under oxidative conditions for the present and previously studied long-chain esters of primary order terpene alcohols showing it independence on the type of alcohol used for their synthesis.

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“…Generally, it was a time-consuming process to obtain fully substituted cellulose esters with fatty acids in DMA/LiCl. However, acylation of cellulose with acyl chlorides in DMA/LiCl by microwave irradiation gave esters with a DS approaching 3 in times as short as 3 min [9,10]. Microwave-induced acylation of cellulose by fatty acids or acyl chlorides was a rapid method to prepare LCCEs [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…However, acylation of cellulose with acyl chlorides in DMA/LiCl by microwave irradiation gave esters with a DS approaching 3 in times as short as 3 min [9,10]. Microwave-induced acylation of cellulose by fatty acids or acyl chlorides was a rapid method to prepare LCCEs [9][10][11]. One of the potential disadvantages of the acylation of cellulose with acyl chlorides was the degradation of cellulose or cellulose esters for the existence of HCl produced in the reaction [3].…”

Section: Introductionmentioning

confidence: 99%

Thermal Properties and Thermal Degradation of Cellulose Tri-Stearate (CTs)

Huang

2012

Polymers

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Cellulose tri-stearate (CTs) was synthesized employing trifluoroacetic anhydride (TFAA), stearic acid (SA), with microcrystal cellulose (MCC) and characterized with FT-IR and 1 H-NMR. The degree of substitution of CTs was determined by the traditional saponification method and 1 H-NMR. The thermal properties of CTs were investigated by the thermogravimetric analysis (TGA) under Ar flow in dynamic heating conditions. Thermal stability, activation energy, as well as the degradation mechanism of the decomposition process were revealed. The results showed that the thermal stability of CTs is superior to that of raw materials-MCC, and that the degradation of CTs in argon is a first-order weight loss; the initial decomposition temperature and the temperature corresponding to maximum degradation rate (T p ) increase with an increase in heating rate. The activation energy values were calculated with the Ozawa method, Coats-Redfern method and Kinssinger method, respectively. Analyses of experimental results suggest that the degradation mechanism 0.10 < α < 0.80 is F2 type, A3 for α < 0.1, and R3 for α > 0.80. The degradation mechanism of CTs in the whole conversion range is a complex mechanism, and is the combination of A3, F2 and R3.

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Rapid homogeneous esterification of cellulose induced by microwave irradiation

Cited by 90 publications

References 10 publications

Synthesis and processing of biodegradable and bio-based polymers by microwave irradiation

Synthesis and processing of biodegradable and bio-based polymers by microwave irradiation

Thermal properties of neryl long-chain esters obtained under microwave irradiation

Thermal Properties and Thermal Degradation of Cellulose Tri-Stearate (CTs)

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