Biodegradable poly (lactic acid)-poly (ε-caprolactone)-nanolignin composite films with excellent flexibility and UV barrier performance

Yang, Weijun; Qi, Guochuang; Ding, Hui; Xu, Pengwu; Dong, Weifu; Zhu, Xiangmiao; Zheng, Ting; Ma, Piming

doi:10.1016/j.coco.2020.100497

Cited by 55 publications

(18 citation statements)

References 22 publications

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“…When the LNP- g -PLLA copolymer was loaded, the strength and modulus were gradually enhanced until they reached 38.4 and 1847 MPa when 15 wt % of the copolymer was inserted, whereas the elongation at break was dramatically decreased to 8.2%. The significant improvement in the mechanical performance was supposed to be attributed to the interfacial compatibility between PDLA and the LNP- g -PLLA copolymer, combined with the inherent reinforcement effect of lignin nanoparticles. , …”

Section: Results and Discussionmentioning

confidence: 67%

“…The significant improvement in the mechanical performance was supposed to be attributed to the interfacial compatibility between PDLA and the LNP-g-PLLA copolymer, 22 combined with the inherent reinforcement effect of lignin nanoparticles. 38,41 Ultraviolet Spectroscopy. lignin, especially in its nanosize, has a remarkable UV resistance effect.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Fabrication of UV- and Heat-Resistant PDLA/PLLA-g-Nanolignin Composite Films by Constructing Interfacial Stereocomplex Crystallites

Yang

Xiao

Ding

et al. 2021

ACS Sustainable Chem. Eng.

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In the present work, a lignin nanoparticle grafted on a PLLA copolymer (LNP-g-PLLA) was prepared via ring-open polymerization with L-lactide as the raw material and −OH of lignin as the initiator. Then, PDLA/PLLA-g-nanolignin composite films with various quantities of LNP-g-PLLA were fabricated by a solvent casting method. Results from differential scanning calorimetry and wide-angle X-ray diffraction evidenced the formation of SC at the interface between PDLA and the LNP-g-PLLA copolymer, which was helpful to improve the heat resistance. Dynamic mechanical analysis showed that the storage moduli of the PDLA/15g-LNP composite sample are 547 and 264 MPa at 80 and 140 °C, respectively, while they are only 12 and 4 MPa for pure PDLA. The tensile test results illustrated a significant improvement in the mechanical performance, which was supposed to be attributed to the interfacial compatibility between PDLA and the LNP-g-PLLA copolymer, resulting in the enhancement of the HC crystallization of PDLA. Furthermore, PDLA/PLLA-g-nanolignin composite films were found to have excellent UV resistance due to the inherent UV shielding property of lignin nanoparticles. When the LNP-g-PLLA amount was 9.0 wt %, the PDLA/9g-LNP film shielded nearly 100 wt % of UV-B irradiation, while only quite limited UV-A irradiation was transmitted. The excellent heat resistance and UV shielding properties endow the composite films with great potential application in some heatable and UV shielding packaging.

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Section: Results and Discussionmentioning

confidence: 67%

Section: ■ Results and Discussionmentioning

confidence: 99%

Fabrication of UV- and Heat-Resistant PDLA/PLLA-g-Nanolignin Composite Films by Constructing Interfacial Stereocomplex Crystallites

Yang

Xiao

Ding

et al. 2021

ACS Sustainable Chem. Eng.

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“…More interestingly, lignin could also simultaneously react with lactide and caprolactone monomer to synthesize a poly(caprolactone- co -lactide) (PCLLA) rubbery layer, and then poly( d -lactide) (PDLA) was formed by the polymerization of d -lactide as the outer segments to prepare a lignin–rubber–PDLA hybrid material, which could obviously enhance the interaction between lignin and PLA . In the research of Yang et al, the incorporation of 6 wt % lignin- g -poly(caprolactone- co -lactide) could contribute to improved mechanical properties of the PLA/PCL blend, which was attributed to the PLA and PCL chains of the lignin-based copolymer providing better interfacial adhesion and mobility with the thermoplastic matrix . Such copolymer materials composed of lignin and lactide or caprolactone monomer are a class of novel materials used as slight toughening additives or functional materials, and the further investigation of these composites by optimizing synthetic conditions and formulas is necessary for the development or application of lignin-derived biodegradable composites.…”

Section: Graft Copolymerizationmentioning

confidence: 99%

“…153 In the research of Yang et al, the incorporation of 6 wt % lignin-g-poly(caprolactone-co-lactide) could contribute to improved mechanical properties of the PLA/PCL blend, which was attributed to the PLA and PCL chains of the lignin-based copolymer providing better interfacial adhesion and mobility with the thermoplastic matrix. 154 Such copolymer materials composed of lignin and lactide or caprolactone monomer are a class of novel materials used as slight toughening additives or functional materials, and the further investigation of these composites by optimizing synthetic conditions and formulas is necessary for the development or application of lignin-derived biodegradable composites. As shown in Table 2, there are two main methods to improve the compatibility between lignin and BPPs for better mechanical properties.…”

Section: ■ Graft Copolymerizationmentioning

confidence: 99%

Technical Lignin Valorization in Biodegradable Polyester-Based Plastics (BPPs)

Zhou

Wang

Xiong

et al. 2021

ACS Sustainable Chem. Eng.

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Synthetic plastics have been reshaping the planet since the early 20th century. They have brought plenty of conveniences to our lives; meanwhile, plastic wastes discarded into the environment are resistant to biodegradation, accumulating in soil, water, and even in organisms. Biodegradable polyester-based plastics (BPPs), such as polylactic acid (PLA), poly(butylene adipate-co-terephthalate) (PBAT), poly(butylene succinate) (PBS), polycaprolactone (PCL), and poly(β-hydroxybutyric acid) (PHB) are considered to be ecofriendly and sustainable alternatives and have thrived rapidly in the past few decades. However, the applications of BPPs have been limited by their high prices compared to conventional plastics, while blending with lowcost fillers has been deemed to be a facile and efficient solution to the foregoing issues. Technical lignin, a class of biodegradable aromatic polymers, has been extracted/isolated at a large scale as a coproduct in the conventional paper-making and the emerging lignocellulosic biorefinery industries. The economically competitive BPP composites reinforced by coproduct lignin could not only facilitate the lignin valorization but also improve the economic viability of the lignocellulosic biorefinery. At present, the key obstacle lies in the incompatibility between lignin and BPPs resulting from self-aggregation and thermal condensation of lignin due to its polyhydroxy aromatic structures. Herein, we overviewed a series of effective approaches to promote the interaction between lignin and BPPs by adding plasticizers and blocking the hydroxyl groups. Furthermore, lignin can act as functional fillers endowing lignin/BPP composites favorable versatilities and expanding their applications in the fields of flame retardant packaging, food packaging, medical materials, outside packaging, and mulching films. In the end, we review the developments of lignin/BPP blending composites in the future and propose current problems that need to be solved.

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“…For example, lignin nanoparticles (LNPs) are helpful to fabricate novel and well-performing bio-nanocomposite materials [ 13 , 14 , 15 , 16 , 17 , 18 ]. Anti-ultraviolet (UV)/anti-bacterial coatings [ 19 , 20 ], the controlled release of drugs [ 21 , 22 ] and the adsorption of heavy metal ions [ 23 ] are a couple of proven examples.…”

Section: Introductionmentioning

confidence: 99%

Lignin Nanoparticles and Alginate Gel Beads: Preparation, Characterization and Removal of Methylene Blue

et al. 2022

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A novel and effective green system consisting of deep eutectic solvent (DES) was proposed to prepare lignin nanoparticles (LNPs) without any lignin modification. The LNPs are obtained through the dialysis of the kraft lignin-DES solution. The particle size distribution, Zeta potential and morphology of the LNPs are characterized by using dynamic light scattering (DLS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The average diameter of LNPs is in the range 123.6 to 140.7 nm, and the LNPs show good stability and dispersibility in water. The composite beads composed of LNPs and sodium alginate (SA) are highly efficient (97.1%) at removing methylene blue (MB) from the aqueous solution compared to 82.9% and 77.4% by the SA/bulk kraft lignin composite and pure SA, respectively. Overall, the LNPs-SA bio-nanocomposite with high adsorption capacity (258.5 mg/g) could be useful in improving water quality and other related applications.

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Biodegradable poly (lactic acid)-poly (ε-caprolactone)-nanolignin composite films with excellent flexibility and UV barrier performance

Cited by 55 publications

References 22 publications

Fabrication of UV- and Heat-Resistant PDLA/PLLA-g-Nanolignin Composite Films by Constructing Interfacial Stereocomplex Crystallites

Fabrication of UV- and Heat-Resistant PDLA/PLLA-g-Nanolignin Composite Films by Constructing Interfacial Stereocomplex Crystallites

Technical Lignin Valorization in Biodegradable Polyester-Based Plastics (BPPs)

Lignin Nanoparticles and Alginate Gel Beads: Preparation, Characterization and Removal of Methylene Blue

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