High-performance Esterified-Poly (vinyl alcohol)-Citric acid-Lignin resin and its application to Wet-spun nanocellulose Filament-Reinforced polymer composite

Agumba, Dickens O.; Kumar, Bijender; Latif, Muhammad; Panicker, Pooja S.; Pham, Hoa D.; Kim, Jaehwan

doi:10.1016/j.compositesa.2021.106735

Cited by 21 publications

(39 citation statements)

References 43 publications

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“…The H-PCL30 resin was prepared by blending 7 wt % PVA-lignin solution (6.5:3.5) with citric acid in a ratio of 7:3 and processed according to the previous report. 10 The resin was placed in an aluminum U-channel bath and degassed for 10 min before the fiber coating process. The H-PCL-coated NCLF was heated at 180 °C for 40 min in a vacuum oven (Lab Companion OV4-30, Jeio Tech, South Korea) to form E-PCL-NCLF.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…The H-PCL30 resin was prepared by blending 7 wt % PVA-lignin solution (6.5:3.5) with citric acid in a ratio of 7:3 and processed according to the previous report . The resin was placed in an aluminum U-channel bath and degassed for 10 min before the fiber coating process.…”

Section: Methodsmentioning

confidence: 99%

“…Our group has reported the esterified PCL (E-PCL) resin applicable to fabricating all-green fiber-reinforced polymer composites. 10 Hydrogen-bonded PVA−CA−lignin (H-PCL) resin was synthesized and impregnated into NCLF mats, which form an NFRPC by hot pressing. However, its mechanical strength is 363.42 MPa and the water contact angle (WCA) is 104.4°, low for high-performance composites.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Nanocellulose, nano-sized cellulose owned from natural resources, has been extensively examined as a building block for strong, renewable, biodegradable, lightweight, and nontoxic composite materials. − Cellulose nanofiber (CNF) is a decorative element of nanocellulose well known for its high aspect ratio, high mechanical properties, transparency, and flexibility. − Due to these distinct properties, it is constantly in the spotlight regarding production and processing. These explicit aspects of CNFs paved the way for their broad applications in natural fiber-reinforced polymer composites (NFRPCs). − However, various concerns with employing CNFs as a composite reinforcement include their short length, inherent hydrophilicity, and weak interfacial bonding. , In fabricating strong and tough long fiber with CNFs, their alignment is essential, which requires sophisticated and diverse alignment processes, but most of these techniques are costly and complex, making industrial scaling of the long fiber fabrication difficult . Owing to the molecular structure of CNF and its inherent strength, a wide range of approaches for fiber fabrication such as wet spinning, cold drawing, wet stretching, self-assembly, and electrospinning are currently effective in the field of research. − In addition, external electric and magnetic field alignment approaches were investigated to achieve well-aligned CNFs with superior mechanical performance. − …”

Section: Introductionmentioning

confidence: 99%

“…It is prepared by coating poly(vinyl alcohol) (PVA)–citric acid (CA)–lignin (PCL) resin on a pristine NCLF and esterifying them, which is called E-PCL-NCLF. Our group has reported the esterified PCL (E-PCL) resin applicable to fabricating all-green fiber-reinforced polymer composites . Hydrogen-bonded PVA–CA–lignin (H-PCL) resin was synthesized and impregnated into NCLF mats, which form an NFRPC by hot pressing.…”

Section: Introductionmentioning

confidence: 99%

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High-Strength, Multifunctional, and Long Nanocellulose Hybrid Fibers Coated with Esterified Poly(vinyl alcohol)–Citric Acid–Lignin Resin

Panicker

Agumba

Kim

2022

ACS Sustainable Chem. Eng.

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In natural fiber-reinforced polymer composites, strong and tough nanocellulose long fibers (NCLFs) are in high demand. Despite the availability of diverse cellulose nanofiber (CNF) preparations, efficient production of continuous high-strength NCLFs remains a challenge. This study reports a synergistic approach that entails wet spinning and coating CNF with a bio-based and hydrogen-bonded polyvinyl alcohol–citric acid–lignin (H-PCL) resin followed by esterification at 180 °C to form esterified poly(vinyl alcohol)–citric acid–lignin (E-PCL)–NCLF. Morphology assessments on the cross-sectional images of E-PCL-NCLF by scanning electron microscopy revealed a homogeneous coating of H-PCL resin with an average coating thickness of 0.8 μm. The prepared fiber showed a dramatic increase in the mechanical properties with a Young’s modulus of 31.20 GPa (49% increase), a tensile strength of 684.61 MPa (138% increase), and a toughness of 12.90 MJ/m3 (10% increase) with a strain at break of 3.26%. The reported approach imparted multifunctional characteristics in the prepared EPCL-NCLF regarding high hydrophobicity, antioxidant activity, and thermal stability. These remarkable enhancements make the prepared EPCL-NCLF a promising candidate for all-green natural fiber-reinforced polymer composites.

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Section: ■ Materials and Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

High-Strength, Multifunctional, and Long Nanocellulose Hybrid Fibers Coated with Esterified Poly(vinyl alcohol)–Citric Acid–Lignin Resin

Panicker

Agumba

Kim

2022

ACS Sustainable Chem. Eng.

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Advanced Green Thermoset Resin Tailored for Nanocellulose‐Based Filament‐Reinforced Polymer Composite and Sustainable Development

Agumba

Panicker

Pham

et al. 2022

Advanced Sustainable Systems

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White pollution has caused extensive damage to the environment, thus making sustainable development necessary. Bioresources such as starch and cellulose are attractive candidates for sustainable materials. Despite the enticing aspects, engineering high‐performance materials from starch and cellulose have not been feasible due to the suboptimal performance of the final products. Here, this work reports a high‐strength and all‐green resin synthesized from low‐cost and abundant sustainable resources of starch, citric acid (CA), and lignin through esterification. The resulting resin discloses a record high strength (158.79 ± 6.51 MPa) and toughness (6.26 ± 0.39 MJ m−3), well above the existing starch‐based and epoxy resins. The adhesion strength (23.94 ± 1.092 MPa) of the resin to cellulose film highlights its feasibility in developing high‐performance cellulose‐reinforced polymer composite. A nanocellulose‐based long filament is manufactured via wet‐spinning on a continuous rapid fiber production system and knit into mats to ascertain the hypothesis. By integrating the resin into nanocellulose‐based filament mats through hand‐layup, hot‐pressing, and postcuring, an all‐green composite is conceived with excellent flexural strength (315.9 ± 20.1 MPa) and stiffness (34.4 ± 1.16 MPa). The high‐strength and all‐green resin can be used in natural fiber composites for automotive, packaging, and optics.

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Facile chemical modification of poly(vinyl alcohol) to an organosoluble, flame‐retardant copolymer using dichloroacetic acid

Km,

Ravishankar,

Raghavachari

2023

J of Applied Polymer Sci

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Applications of poly(vinyl alcohol) (PVOH) are largely limited due to its poor flame resistance. In this work, organosolubility, and flame resistance are imparted to PVOH through green chemical transformation using dichloroacetic acid (DCAA). Unlike the conventional solvent‐based strategies, PVOH was modified by simply mixing it with DCAA and heating the mixture without employing any additional reagents/catalysts/solvents. This resulted in the formation of a random copolymer, poly(vinyl alcohol‐co‐vinyl dichloroacetate), which was not soluble in water but was soluble in organic solvents such as acetone, methanol, and dimethylsulfoxide. Furthermore, the copolymer was inherently self‐extinguishing, and did not melt drip or show glowing combustion. Additionally, dummy currency notes coated with this copolymer displayed exceptional self‐extinguishing and non‐glowing properties when removed from the flame, proving the copolymer's suitability for flame‐retardant sizing/coating applications.

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High-performance Esterified-Poly (vinyl alcohol)-Citric acid-Lignin resin and its application to Wet-spun nanocellulose Filament-Reinforced polymer composite

Cited by 21 publications

References 43 publications

High-Strength, Multifunctional, and Long Nanocellulose Hybrid Fibers Coated with Esterified Poly(vinyl alcohol)–Citric Acid–Lignin Resin

High-Strength, Multifunctional, and Long Nanocellulose Hybrid Fibers Coated with Esterified Poly(vinyl alcohol)–Citric Acid–Lignin Resin

Advanced Green Thermoset Resin Tailored for Nanocellulose‐Based Filament‐Reinforced Polymer Composite and Sustainable Development

Facile chemical modification of poly(vinyl alcohol) to an organosoluble, flame‐retardant copolymer using dichloroacetic acid

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