Characterization and Thermal Stability of Acetylated Slicewood Production by Alkali-Catalyzed Esterification

Hung, Ke-Chang; Yang, Chen-Ning; Yang, Tiankui; Wu, Tung-Lin; Chen, Yonglong; Wu, Jyh‐Horng

doi:10.3390/ma10040393

Cited by 12 publications

(3 citation statements)

References 29 publications

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“…As shown in Table 3 , the E a at 10% conversion of various lignocellulosic materials increase in order of Taiwan red pine (146–161 kJ/mol), makino bamboo (158–175 kJ/mol), India-charcoal trema (185–194 kJ/mol) and Chinese fir (194–202 kJ/mol). The E a is defined as the minimum energy that must be overcome to start a chemical reaction [ 27 ]. As the E a value increases, the minimum energy required to start thermal decomposition also increases.…”

Section: Resultsmentioning

confidence: 99%

Characterization of Wood-Plastic Composites Made with Different Lignocellulosic Materials that Vary in Their Morphology, Chemical Composition and Thermal Stability

et al. 2017

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Abstract:In this study, four kinds of lignocellulosic fibers (LFs), namely, those from Chinese fir (Cunninghamia lanceolata), Taiwan red pine (Pinus taiwanensis), India-charcoal trema (Trema orientalis) and makino bamboo (Phyllostachys makinoi), were selected as reinforcements and incorporated into high-density polyethylene (HDPE) to manufacture wood-plastic composites (WPCs) by a flat platen pressing process. In addition to comparing the differences in the physico-mechanical properties of these composites, their chemical compositions were evaluated and their thermal decomposition kinetics were analyzed to investigate the effects of the lignocellulosic species on the properties of the WPCs. The results showed that the WPC made with Chinese fir displayed a typical M-shaped vertical density profile due to the high aspect ratio of its LFs, while a flat vertical density profile was observed for the WPCs made with other LFs. Thus, the WPC made with Chinese fir exhibited higher flexural properties and lower internal bond strength (IB) than other WPCs. In addition, the Taiwan red pine contained the lowest holocellulose content and the highest extractives and α-cellulose contents, which gave the resulting WPC lower water absorption and flexural properties. On the other hand, consistent with the flexural properties, the results of thermal decomposition kinetic analysis showed that the activation energy of the LFs at 10% of the conversion rate increased in the order of Taiwan red pine (146-161 kJ/mol), makino bamboo (158-175 kJ/mol), India-charcoal trema (185-194 kJ/mol) and Chinese fir (194-202 kJ/mol). These results indicate that the morphology, chemical composition and thermal stability of the LFs can have a substantial impact on the physico-mechanical properties of the resulting WPCs.

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Section: Resultsmentioning

confidence: 99%

Characterization of Wood-Plastic Composites Made with Different Lignocellulosic Materials that Vary in Their Morphology, Chemical Composition and Thermal Stability

et al. 2017

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“…Therefore, the initial blocking of the hydroxyl end group blocks to some extent the second degradation process (Persenaire et al, 2001). Works with other polymers also showed that their acetylation lead to an increase of the thermal stability of the modified polymer (Hung et al, 2017;Yang et al, 2018b).…”

Section: Resultsmentioning

confidence: 99%

Amphiphilic Modified Galactomannan as a Novel Potential Carrier for Hydrophobic Compounds

Cerqueira

Pinheiro

Pastrana

2019

Front. Sustain. Food Syst.

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“…The average E a of BF/WF/HDPE composites increased to 204.6 kJ/mol after the fiber loading level increased to 6.7 wt.%. E a is a key factor used to ascertain the reaction rate, indicative of the minimum energy necessary to reach an activating molecule from the reactant molecule in the chemical reaction [42]. Different reactions are matched with different activation energies.…”

Section: Kinetics Of Wpc Reinforced With Bfsmentioning

confidence: 99%

Thermal Decomposition Kinetics of Basalt Fiber-Reinforced Wood Polymer Composites

Zhang

Huang

2020

Polymers

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Thermogravimetric analysis (TGA) was used for the observation of the pyrolysis kinetics characteristics of high density polyethylene (HDPE)-based composites enhanced by a variety of basalt fibers (BFs) and wood flour (WF). The improved Coats-Redfern (C-R), Flynn-Wall-Ozawa (F-W-O), Friedman, and Kissinger methods were utilized to ascertain the specific apparent activation energy (Ea) of each component and composite material. The results indicate that BFs do not decompose under 800 °C, while the pyrolysis of WF and waste HDPE showed two significant weight loss zones (250–380 °C and 430–530 °C), relative to cellulose/hemicellulose and HDPE thermal degradation, respectively. The average Ea of WF/BF/HDPE composites over the entire pyrolysis process obtained by the modified C-R method fluctuated in a range of 145–204 kJ/mol and increased with the BF content, which was higher than that of WPC (115–171 kJ/mol). The value of Ea computed by the F-W-O method was significantly lower than that computed with the improved C-R method, which could validate the reliability of two methods by comparing with the literature. The Friedman and Kissinger methods were not applicable to this composite material reinforced by mixed fillers, so the obtained Ea values were quite different from the previous two methods. The changes in Ea showed that the addition of BFs could improve the average Ea and further enhance the thermal stability and flame resistance of the composites.

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Characterization and Thermal Stability of Acetylated Slicewood Production by Alkali-Catalyzed Esterification

Cited by 12 publications

References 29 publications

Characterization of Wood-Plastic Composites Made with Different Lignocellulosic Materials that Vary in Their Morphology, Chemical Composition and Thermal Stability

Characterization of Wood-Plastic Composites Made with Different Lignocellulosic Materials that Vary in Their Morphology, Chemical Composition and Thermal Stability

Amphiphilic Modified Galactomannan as a Novel Potential Carrier for Hydrophobic Compounds

Thermal Decomposition Kinetics of Basalt Fiber-Reinforced Wood Polymer Composites

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