High solid content production of environmentally benign ultra-thin lignin-based polyurethane films: Plasticization and degradation

Zhang, Yan; Wang, Jingya; Fang, Xiangchen; Liao, Jianjun; Zhou, Xin; Zhou, Shihua; Bai, Fudong; Peng, Shaozhong

doi:10.1016/j.polymer.2019.121572

Cited by 36 publications

(16 citation statements)

References 38 publications

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“…More specifically, components extracted from wood products were the focus of many studies. This includes cellulose, 21,22 tannins, 6,23–25 and lignin 3,4,8,10,11,12,20,22,26,27,28–37,38–47,48,49 . Cellulose, is the main component of the wood structure and was generally liquefied to enter the polyol phase, using crude glycerol 21 or ethylene carbonate 22 .…”

Section: Introductionmentioning

confidence: 99%

“…The approaches include the liquefaction into a polyol 22,30,32,44 (mainly polyethylene glycol, ethylene carbonate or glycerol, sometime microwaves assisted 12,31,36,37 ), the functionalization, 38,40,46,49,55 the depolymerization, 3 the oxypropylation 12 or the introduction as filler 20,34 . The final product can be a film, 11,40,43 an elastomer, 27,45 a rigid foam 3,4,10,20,32,35,36,42,45,54 or a flexible foam 12,31,33,34,37,38,41,45 . If some of those studies were really promising, none of those technologies actually reached yet the market, as they all include some road blocks.…”

Section: Introductionmentioning

confidence: 99%

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Influence of lignin's pH on polyurethane flexible foam formation and how to control it

Maillard

Osso

Faye

et al. 2020

J of Applied Polymer Sci

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Low pH of commercial lignins has a catastrophic impact on the polyurethane foaming reactions. Experiments were performed with 10 wt% of lignin with various pHs in polyols. Virgin lignin (pH 2.5, 35% moisture) has the most negative impact as it reduces the initial foam rising rate by 85% and the foam's final height by 35% as compared to the reference foam, lignin free. Drying of this lignin at 80°C for 12 h can reduce this impact while alkaline treatment to bring the lignin's pH to 6.6 almost cancel it. As revealed by in situ dielectric constant measurements, both reactions, gelling via polymerization and blowing via CO2 degassing, are impacted. In situ Fourier transform infrared analysis of the foaming process demonstrated that blowing reaction is the most pH sensitive. Two methods to counter the pH influence by pH modification were tested and provide interesting results but also significant drawbacks limiting their applicability.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of lignin's pH on polyurethane flexible foam formation and how to control it

Maillard

Osso

Faye

et al. 2020

J of Applied Polymer Sci

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“…However, the decrease in decomposition temperatures was higher for PLA bio-composites than in our PHBV bio-composites. Zhang et al [ 71 ] reported a considerable decrease in initial decomposition temperature for the ATBC-plasticized polyurethanes. As was stated in the DSC section, the low concentration (1 wt.…”

Section: Resultsmentioning

confidence: 99%

The Influence of Additives and Environment on Biodegradation of PHBV Biocomposites

et al. 2022

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The biodegradation of polyhydroxybutyrate-co-hydroxyvalerate (PHBV) ternary biocomposites containing nature-based plasticizer acetyl tributyl citrate (ATBC), heterogeneous nucleation agents—calcium carbonate (CaCO3) and spray-dried lignin-coated cellulose nanocrystals (L-CNC)—in vermicomposting, freshwater biotope, and thermophilic composting have been studied. The degree of disintegration, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and the evaluation of surface images taken by scanning electron microscopy (SEM) were conducted for the determination influence of different environments and additives on the biodegradation of PHBV. Furthermore, the method adapted from ISO 14855-1 standard was used for thermophilic composting. It is a method based on the measurement of the amount of carbon dioxide evolved during microbial degradation. The highest biodegradation rate was observed in the thermophilic condition of composting. The biodegradation level of all PHBV-based samples was, after 90 days, higher than 90%. Different mechanisms of degradation and consequently different degradation rate were evaluated in vermicomposting and freshwater biotope. The surface enzymatic degradation, observed during the vermicomposting process, showed slightly higher biodegradation potential than the hydrolytic attack of freshwater biotope. The application of ATBC plasticizers in the PHBV matrix caused an increase in biodegradation rate in all environments. However, the highest biodegradation rate was achieved for ternary PHBV biocomposites containing 10 wt. % of ATBC and 10 wt. % of CaCO3. A considerable increase in the degree of disintegration was evaluated, even in freshwater biotope. Furthermore, the slight inhibition effect of L-CNC on the biodegradation process of ternary PHBV/ATBC/L-CNC could be stated.

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“…[ 79 ] Moreover, using PCL and other biodegradable secondary polyols can also endow polyurethane with biodegradability. [ 80 ] Previous study used the diisocyanate derived from vanillic acid to react with unmodified lignin and produced a high‐biomass content polyurethane coating, which achieved an adhesive strength greater than 9 MPa with glass (9 MPa was the maximum allowable instrumental reading). [ 81 ]…”

Section: Lignin‐based Polyurethane Elastomermentioning

confidence: 99%

Lignin‐Based Polyurethane: Recent Advances and Future Perspectives

Chen

Zhu

et al. 2020

Macromol. Rapid Commun.

113

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Polyurethane (PU), as a polymer material with versatile product forms and excellent performance, is used in coatings, elastomers, adhesives, and foams widely. However, the raw materials (polyols and isocyanates) of PU are usually made using petroleum‐derived chemicals. With the concern for depletion of petroleum resources and the associated negative impact on the environment, developing technologies that can use renewable raw materials as feedstock has become a research hotspot. Lignin, as an abundant, natural, and renewable organic carbon resource, has been explored as raw material for making polyurethanes because it possesses rich hydroxyl groups on its surface. Meanwhile, compared to vegetable oils, lignin does not compete with food supply and performance of the resulting products is superior. Lignin or modified lignin has been shown to impart the polyurethane material with additional functionalities, such as UV‐blocking ability, hydrophobicity, and flame retardancy. However, the utilization of lignin has encountered some challenges, such as product isolation, heterogeneity, aggregation, steric hindrance, and low activity. This paper summarizes recent research progress on utilizing lignin and modified lignin for bio‐based polyurethane synthesis with a focus on elastomers and foams. Opportunities and challenges for application of the lignin‐based polyurethanes in various fields are also discussed.

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High solid content production of environmentally benign ultra-thin lignin-based polyurethane films: Plasticization and degradation

Cited by 36 publications

References 38 publications

Influence of lignin's pH on polyurethane flexible foam formation and how to control it

Influence of lignin's pH on polyurethane flexible foam formation and how to control it

The Influence of Additives and Environment on Biodegradation of PHBV Biocomposites

Lignin‐Based Polyurethane: Recent Advances and Future Perspectives

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