Modification of rapeseed straw with organic acid anhydrides

Paukszta, Dominik; Doczekalska, Beata; Ostrowski, Adam; Bartkowiak, M.

doi:10.1177/0021998314534096

Cited by 8 publications

(8 citation statements)

References 38 publications

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“…A certain amount of free radicals in the native rapeseed straw is frequently observed as a result of generation of radicals during the plant growth, which has been repeatedly reported . After mercerization and chemical treatment, the number of free radicals increases, which has been also observed in our previous studies …”

Section: Resultssupporting

confidence: 84%

“…Additionally, broad unresolved and superimposed lines were observed for all samples (rather small for native), especially for the composites (Figure ). Similarly as in the previous work we assigned these lines to paramagnetic impurities (presumably Fe 3+ , Mn 2+ , Cu 2+ , etc.) which entered the straw and the composites upon chemical treatment and/or recycling process.…”

Section: Resultsmentioning

confidence: 73%

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Recycling of lignocellulosics filled polypropylene composites. I. Analysis of thermal properties, morphology, and amount of free radicals

Paukszta

Markiewicz

Ostrowski

et al. 2014

J of Applied Polymer Sci

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Composites of isotactic polypropylene filled with comminuted rapeseed straw are studied. Improvement in interfacial adhesion is achieved by chemical modification of the lignocellulose filler. Composites were subjected to recycling by extrusion. The effect of multiple recycling of the composites on the process of nucleation and crystallization of polypropylene matrix, surface topography, and free radical generation was checked. On the basis of differential scanning calorimetry data, a significant influence of the recycling on nucleation activity of the lignocellulose filler was evidenced. A relation between the filler particle size and multiple recycling was established by observations under a polarization microscope, while scanning electron microscope analyses confirmed the positive effect of chemical modification of rapeseed straw on the interfacial adhesion. The composite structure changes forced by multiple recycling are discussed in the context of free radical generation. Concentration of free radicals in the rapeseed straw samples and composites was measured by the electron paramagnetic resonance spectroscopy to show that it was higher in the systems subjected to multiple recycling. Interestingly, the composites after multiple recycling showing elevated concentration of free radicals are also characterized by higher nucleation activity.

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Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 73%

Recycling of lignocellulosics filled polypropylene composites. I. Analysis of thermal properties, morphology, and amount of free radicals

Paukszta

Markiewicz

Ostrowski

et al. 2014

J of Applied Polymer Sci

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“…All treated samples presented infrared bands between 1730 and 1750 cm -1 . This indicates reactions between MA molecules and wood hydroxyl groups to form ester bonds (monoester and/or diester bonds) (Paukszta et al 2014). This contributes to the ASE values obtained.…”

Section: Fourier Transform Infrared Spectroscopy Analysis (Ftir)mentioning

confidence: 70%

Maleic Anhydride Treated Wood: Effects of Drying Time and Esterification Temperature on Properties

Essoua¹,

Blanchet²,

Landry³

et al. 2015

BioResources

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To improve technical performance of wood siding, treatment with maleic anhydride was applied. The effects on technical performance of drying time and esterification temperature parameters were analyzed. Wood samples of lodgepole pine and white pine were treated and tested. Results indicated that treatment improves technical performance of wood (dimensional stability, fungal degradation resistance, and accelerated aging). FTIR spectroscopy analysis showed spectra with peaks at 1750 to 1730 cm -1 . These correspond to ester bonds formed between wood hydroxyl groups and MA carboxylic acid groups. SEM images indicate that the MA quantity in wood cavities was increased with decreasing esterification temperature. Weight percent gain (WPG) increased with decreasing time and temperature of esterification. Artificial aging and fungal degradation performances were monitored using FTIR analysis. Esterification temperature had no important effect on fungal degradation. Weight loss after fungal exposure of treated samples was not only due to fungal action but also due to evaporation of MA during the drying step. Regarding artificial aging, degradation of wood components and ester bonds were less for samples esterified at 180 °C than those esterified at 160 °C or 140 °C.

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“…Regarding the chemical analyses by Fourier transform infrared spectroscopy (FTIR), the spectra of all treated specimens (Fig. 6) presented peaks between 1720 and 1750 cm -1 corresponding to ester bonds (Paukszta et al 2014). Ester groups resulted from polymerization reactions between glycerol and citric acid molecules, and between the carboxylic groups of citric acid and wood hydroxyl (OH) groups (monoester and/or diester linking).…”

Section: Swelling (α) Shrinkage (β) and Anti-swelling Efficiency Anmentioning

confidence: 99%

Pine Wood Treated with a Citric Acid and Glycerol Mixture: Biomaterial Performance Improved by a Bio-byproduct

et al. 2016

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Wood material is a good reservoir for biogenic carbon storage. The use of wood material for outdoor products such as siding in the building construction sector presents limits. These limits are bound to the nature of wood material (hygroscopic property and anatomical structure). They are responsible for the dimensional variation associated with moisture content variations. Fungal attacks and coating layers adhesion on wood surface, are other problems. This research investigated the feasibility of impregnation with environmentally friendly chemicals, i.e., a citric acidglycerol mixture (CA-G). The anti-swelling efficiency (ASE), hardness, biodegradation, and coating adhesion tests were performed on softwood specimens. ASE results were up to 53%. The equilibrium moisture content of the treated specimens was less than half of the untreated ones. FTIR spectroscopy showed bands at 1720 to 1750 cm -1 , indicating the presence of ester bonds, and scanning electron microscopy images confirmed the polymerization and condensation of treatment solution inside the wood structure. Hardness and decay resistance were increased; however, treatment reduces coating adhesion. In conclusion, CA-G represents a promising eco-responsible solution for improving the technical performance of outdoor wood products.

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Modification of rapeseed straw with organic acid anhydrides

Cited by 8 publications

References 38 publications

Recycling of lignocellulosics filled polypropylene composites. I. Analysis of thermal properties, morphology, and amount of free radicals

Recycling of lignocellulosics filled polypropylene composites. I. Analysis of thermal properties, morphology, and amount of free radicals

Maleic Anhydride Treated Wood: Effects of Drying Time and Esterification Temperature on Properties

Pine Wood Treated with a Citric Acid and Glycerol Mixture: Biomaterial Performance Improved by a Bio-byproduct

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