Heterogeneous modification of softwoods cellulose nanofibers with oleic acid: Effect of reaction time and oleic acid concentration

Almasi, Hadi; Ghanbarzadeh, Babak; Dehghannia, J.; Pirsa, Sajad; Zandi, Mohsen

doi:10.1007/s12221-015-4294-1

Cited by 31 publications

(26 citation statements)

References 36 publications

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“…The high intensity OH stretching vibration is due to hydrogen bonding of exposed hydroxyl group in starting NC. Otherwise, decreased intensity of this group in modified material is due to introduction of fatty acid residues contributing to shielding effect of surface groups (Almasi, Ghanbarzadeh, Dehghannya et al, 2015). The absorption peak at 1736 cm −1 derived from the ester carbonyl groups confirms successful modification with OA and FAs isolated from LO and SO (Fig.…”

Section: Ftir Analysis Of Nanocellulosementioning

confidence: 68%

“…The degree of substitution value (DS Gr ) per anhydroglucose unit was determined by gravimetric measurements and calculated using the equations S1 and S2 (Supporting information) (Almasi, Ghanbarzadeh, Dehghannia, Pirsa, & Zandi, 2015).…”

Section: Degree Of Substitution Per Anhydroglucose Unitmentioning

confidence: 99%

“…Pretreatments of the cellulose fibers can modify their surface in a way to avoid water absorption and to increase the surface roughness (Kalia, Kaith, & Inderjeet, 2009). However, only limited work has been published on NC surface modification by carboxylic fatty acids (Almasi, Ghanbarzadeh, Dehghannya, Entezami, & Khosrowshahi Asl, 2015;Wei, Stark, Sabo, & Matuana, 2016;Yoo & Youngblood, 2016). Besides, there is a necessity to achieve complete residual water removal so to provide compatibility between the cellulose surface and polymer .…”

Section: Introductionmentioning

confidence: 99%

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Novel modified nanocellulose applicable as reinforcement in high-performance nanocomposites

Rušmirović

Ivanović

Pavlović

et al. 2017

Carbohydrate Polymers

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The influence of modification and vacuum/supercritical CO (scCO) drying methods on the surface properties, morphology and thermal stability of cellulose nanocrystals (NC) was presented in this study. Introduction of reactive vinyl groups on NC surface was performed by either direct esterification with oleic acid, linseed or sunflower oil fatty acids; or by amidation of maleic acid/ethylene diamine with methyl ester of fatty acid. Obtained modified NC (m-NC) were characterized using FTIR and Raman spectroscopy; and by determination of acid, iodine and ester values. Structural analysis of m-NC showed varieties of forms, from spongy to nanostructural non-uniform layered morphology with observable agglomeration, which confirmed morphology dependence on modification/processing methods Thermogravimetry-MS spectrometry showed different thermal stability and degradation pathways of NC/m-NC. Incorporation of 1 wt% of reactive m-NC in unsaturated polyester lead to high performance nanocomposites and contributed to increase of stress at break in the range from 76 to 93%.

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Section: Ftir Analysis Of Nanocellulosementioning

confidence: 68%

Section: Degree Of Substitution Per Anhydroglucose Unitmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Novel modified nanocellulose applicable as reinforcement in high-performance nanocomposites

Rušmirović

Ivanović

Pavlović

et al. 2017

Carbohydrate Polymers

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“…Scattered radiation was detected at ambient temperature in the angular region (2θ) of 3 • to 70 • at a rate of 10 • /min and a step size of 0.02. The crystallinity index (CrI) of the cellulose derivatives was calculated by the following equation [23]:…”

Section: X-ray Diffraction (Xrd) Analysismentioning

confidence: 99%

Esterification of Cellulose with Long Fatty Acid Chain through Mechanochemical Method

2021

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Mechanochemical reaction, a green synthetic esterification route was utilized to prepare long-chain cellulose esters from microcrystalline cellulose. The influence of reaction conditions such as reaction temperature and time were elucidated. Only low dosage of oleic acid, 1-butyl-3-metylimidazolium acetate, and p-toluenesulfonyl chloride were required. The success of modification reaction was confirmed by Fourier transforms infrared spectroscopy as a new absorbance peak at 1731 cm−1 was observed, which indicated the formation of carbonyl group (C=O). Solid-state nuclear magnetic resonance was also performed to determine the structural property and degree of substitution (DS) of the cellulose oleate. Based on the results, increasing reaction temperature and reaction time promoted the esterification reaction and DS. DS values of cellulose oleates slightly decreased after 12 h reaction time. Besides, X-ray diffraction analysis showed the broadening of the diffraction peaks and thermal stability decreased after esterification. Hence, the findings suggested that grafting of oleic acid’s aliphatic chain onto the cellulose backbone lowered the crystallinity and thermal stability.

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“…The biopolymer materials are reversible to the environment unlike petroleum polymers and they do not pollute the environment. [4][5][6][7][8][9] Soy protein isolate contains at least 90% protein, which is extracted from soybean meal by removing fat and carbohydrates. The use of isolated soy protein (ISP) in various industries is due to increasing the protein content of the product, high water absorption, and emulsifier properties of isolated soy protein.…”

Section: Introductionmentioning

confidence: 99%

Specific Removal of Nitrite from Lake Urmia Sediments by Biohydrogel Based on Isolated Soy Protein/Tragacanth/Mesoporous Silica Nanoparticles/Lycopene

Asadzadeh

Pirsa

2020

Global Challenges

Self Cite

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In this study, a biodegradable biohydrogel based on isolated soy protein/tragacanth containing mesoporous silica nanoparticles and lycopene pigment (ISP/TG/MPS/Lyc) is prepared. The physicochemical characteristics and structure of the biohydrogel are investigated by scanning electron microscopy, Fourier‐transform infrared spectroscopy (FTIR), X‐ray diffraction, and thermal gravimetry analysis (TGA) techniques. Mechanical properties (tensile strength and elongation at break point), antioxidant activity, water solubility, water absorption capacity (WAC), and the humidity content of the biohydrogels are studied. Five optimal biohydrogels including pure ISP, ISP/TG, ISP/MPS, ISP/Lyc, and ISP/TG/MPS/Lyc are used for chemical treatment of Lake Urmia sediments. For this purpose, biochemical oxygen demand (BOD), chemical oxygen demand (COD), nitrate, and nitrite of sediments are examined before and after treatment with biohydrogels. According to the FTIR results, there is only physical interaction between lycopene and isolated soy protein. According to the TGA results, adding silica mesoporous to biohydrogel increases its thermal stability. Tragacanth gum and lycopene pigment reduce water solubility and increase the WAC of biohydrogel. The biohydrogel significantly reduces the BOD and COD of the sediments. The biohydrogel reduces nitrite content up to 90%, while reducing nitrate content by almost 30%. The results show that the biohydrogel containing lycopene selectively purifies nitrite from the sediment solution of Lake Urmia.

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Heterogeneous modification of softwoods cellulose nanofibers with oleic acid: Effect of reaction time and oleic acid concentration

Cited by 31 publications

References 36 publications

Novel modified nanocellulose applicable as reinforcement in high-performance nanocomposites

Novel modified nanocellulose applicable as reinforcement in high-performance nanocomposites

Esterification of Cellulose with Long Fatty Acid Chain through Mechanochemical Method

Specific Removal of Nitrite from Lake Urmia Sediments by Biohydrogel Based on Isolated Soy Protein/Tragacanth/Mesoporous Silica Nanoparticles/Lycopene

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