Improving the thermal stability of wood-based cellulose by esterification

Agustin, Melissa B.; Nakatsubo, Fumiaki; Yano, Hiroyuki

doi:10.1016/j.carbpol.2018.02.071

Cited by 38 publications

(22 citation statements)

References 46 publications

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“…Owing to superior physical properties such as high mechanical strength, low thermal expansion, high aspect ratios, and transparency, cellulose nanofibers (CNF) can be used as an innovative biomass material in the fields of medicine, cosmetics, and pharmaceuticals. Consequently, CNF has been extensively used in academic and industry circles [12][13][14][15] .…”

Section: Use Of Cellulose Nanofibers As a Denture Immersing Solutionmentioning

confidence: 99%

Use of cellulose nanofibers as a denture immersing solution

et al. 2020

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The purpose of this study was to investigate the influence of cellulose nanofibers (CNF) solution on the mechanical and biological properties of denture base resins (DBR). Two types of CNFs obtained from bamboo (BB) and needle-leaved (NB) trees were used in this study. We prepared 18 different CNF solutions based on their fibrillation (A-low, B-middle, and C-high) and concentration (0.05, 0.10, and 0.20 wt%). A heat-polymerized acrylic resin was used as DBR. The contact angles for each specimen were measured after immersion. The flexural properties of the immersed specimens, and the biological properties of the CNF solutions were examined. Specimens immersed in CNF-NB-C-0.05 wt% solution presented with the lowest contact angles. Specimens in CNF-NB-C and CNF-BB-A groups showed higher flexural modulus values. No cytotoxic or antimicrobial effects were observed for the CNF solutions. This study suggest that CNF solution may improve the surface wettability of the DBR without affecting its flexural property.

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Section: Use Of Cellulose Nanofibers As a Denture Immersing Solutionmentioning

confidence: 99%

Use of cellulose nanofibers as a denture immersing solution

et al. 2020

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“…A favourable procedure starting from alkali immersion for one hour and ending up with ten-hour pivaloyl chloride reaction was adopted by comparing three types of treatment to cellulose fiber. It was an economic modification marked by limited modifier, whose mass ratio to pulp fiber only came to 1:1.6 as compared to Agustin's method [8], and less side products. With the addition of 5 wt % PAM apparent performance of composite as well as miscibility of fiber and ABS was improved due to the formation of interlinked three-element structure.…”

Section: Discussionmentioning

confidence: 99%

“…It can also not be neglected that reagent with tertiary butyl, like pivaloyl chloride, has the nature of limited degree of substitution on cellulose. Yano's group found the maximum DS of 0.6 [8]. When extending reaction time to 20 h, one can hardly find signal for ester.…”

Section: Ftir Analysismentioning

confidence: 97%

“…When compared to type2, type3 reduced the amount of catalyst, but added more pivaloyl chloride and then increased the reaction time to 20 h. By designing different reaction conditions modification with longer reaction time and more volume of reactant was contrasted with that including a shorter time, but more capacity of catalysis. Unlike Agustin's method, which adopts acyl chloride to hydroxyl molar ratio of 5:1 with excessive pyridine [8], this procedure generally reduces the volume of reagent and investigates synergistic effects of alkali treatment and esterification on cellulose.…”

Section: Characterizationmentioning

confidence: 99%

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Interface Reinforcement of Pulp Fiber Based ABS Composite with Hydrogen Bonding Initiated Interlinked Structure via Alkaline Oxidation and tert-Butyl Grafting on Cellulose

Zhu

2019

Polymers

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Interface optimization in preparing natural fiber based biocomposite becomes a key factor that determines overall properties, especially mechanical performance. The solution for upgrading interfacial adhesion stemmed from polar fiber and nonpolar polymer remains unclear. Here, a kind of pulp fiber/acrylonitrile-butadiene-styrene (ABS) composite with content ratio of 1:1 was fabricated by functionalizing the cellulose fiber to coordinate interaction between fiber and ABS. With addition of 5 wt % polyacrylamide (PAM) there existed an interlinked three-element structure in composite. Three types of treatment to cellulose fiber, including alkali immersion, pivaloyl chloride grafting for 10 h and 20 h were conducted. Pulp fiber that was treated with alkali for one hour, followed by pivaloyl chloride reaction for ten hours, proved to be effective for interfacial adhesion. X-ray Photoelectron Spectroscopy (XPS) analysis reveals 21.9% of carbonyl and 12.1% of ester function in this fiber, which corresponds to oxidation and grafting. For its composite SEM picture displays that most of cellulose fiber are rooted in ABS and evident traces of tearing or fracture can be observed after tension test. DMA test indicates that this modified pulp fiber/ABS composite exhibits great compatibility, because of combined loss modulus peak ranging from 80 °C to 100 °C. Moreover, the well miscible composite has a tensile strength of 58.1 MPa and elastic modulus of 2515 MPa, increasing by nearly 50% and 60% from those of pure ABS, respectively.

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“…Similarly, such concern can also be found in bottom‐up cellulose materials. To address this concern, many strategies have been developed ( Figure ), including coating (e.g., bulk coating, lumen coating, and fiber coating), [ 79,132–134 ] hybridization with other components (e.g., carbonaceous materials,polymers, minerals, and metals), [ 135–138 ] acetylation treatment, [ 139,140 ] counter‐ion exchange, crosslinking treatment, [ 63 ] esterification, [ 141 ] furfurylation, [ 103 ] and so on. For example, mineral nanoparticle and oil based organic coating have been widely used in wood industry to improve the stability of wood product.…”

Section: Materials Fabrications and Structuresmentioning

confidence: 99%

Nanoscale Ion Regulation in Wood‐Based Structures and Their Device Applications

Chen

2020

Advanced Materials

104

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Ion transport and regulation are fundamental processes for various devices and applications related to energy storage and conversion, environmental remediation, sensing, ionotronics, and biotechnology. Wood‐based materials, fabricated by top‐down or bottom‐up approaches, possess a unique hierarchically porous fibrous structure that offers an appealing material platform for multiscale ion regulation. The ion transport behavior in these materials can be regulated through structural and compositional engineering from the macroscale down to the nanoscale, imparting wood‐based materials with multiple functions for a range of emerging applications. A fundamental understanding of ion transport behavior in wood‐based structures enhances the capability to design high‐performance ion‐regulating devices and promotes the utilization of sustainable wood materials. Combining this unique ion regulation capability with the renewable and cost‐effective raw materials available, wood and its derivatives are the natural choice of materials toward sustainability.

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Improving the thermal stability of wood-based cellulose by esterification

Cited by 38 publications

References 46 publications

Use of cellulose nanofibers as a denture immersing solution

Use of cellulose nanofibers as a denture immersing solution

Interface Reinforcement of Pulp Fiber Based ABS Composite with Hydrogen Bonding Initiated Interlinked Structure via Alkaline Oxidation and tert-Butyl Grafting on Cellulose

Nanoscale Ion Regulation in Wood‐Based Structures and Their Device Applications

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