Poly(lactic acid)/pulp fiber composites: The effect of fiber surface modification and hydrothermal aging on viscoelastic and strength properties

Paunonen, Sara; Berthold, Fredrik; Immonen, Kirsi

doi:10.1002/app.49617

Cited by 11 publications

(6 citation statements)

References 35 publications

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“…That points out that besides acting as a plasticizer, ELO can enhance even further the interaction between the matrix and the fibers. Despite some authors reporting that no major differences could be observed on the SEM micrographs upon incorporation of ELO in green composites of PLA reinforced with birch kraft pulp fibers [33,48], which was attributed to the reasonable interfacial adhesion already observed on the composites without the additive, some other studies revealed similar results to the ones obtained in the present work. For instance, composites of PLA with hazelnut shell flour (HSF) containing 7.5 wt.% ELO showed remarkably different fracture micrographs revealing improved interfacial adhesion [49].…”

Section: Morphological Characterizationsupporting

confidence: 76%

Improving the Processability and Performance of Micronized Fiber-Reinforced Green Composites through the Use of Biobased Additives

et al. 2022

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Green composites made of bioplastics reinforced with natural fibers have gained considerable attention over recent years. However, the use of natural fibers in composites usually compromise some key properties, such as the impact strength and the processability of the final materials. In the present study, two distinct additives, namely an epoxidized linseed oil (ELO) and a sugar-based surfactant, viz. GlucoPure® Sense (GPS), were tested in composite formulations of poly(lactic acid) (PLA) or poly(hydroxybutyrate) (PHB) reinforced with micronized pulp fibers. Both additives showed a plasticizing effect, which led to a decrease in the Young’s and flexural moduli and strengths. At the same time, the elongation and flexural strain at break were considerably improved on some formulations. The melt flow rate was also remarkably improved with the incorporation of the additives. In the PHB-based composites, an increment of 230% was observed upon incorporation of 7.5 wt.% ELO and, in composites based on PLA, an increase of around 155% was achieved with the introduction of 2.5 wt.% GPS. ELO also increased the impact strength to a maximum of 29 kJ m−2, in formulations with PLA. For most composites, a faster degradation rate was observed on the formulations with the additives, reaching, in the case of PHB composites with GPS, a noteworthy weight loss over 75% under burial testing in compost medium at room temperature.

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Section: Morphological Characterizationsupporting

confidence: 76%

Improving the Processability and Performance of Micronized Fiber-Reinforced Green Composites through the Use of Biobased Additives

et al. 2022

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“…For instance, after the addition of 10 and 20 wt% of untreated CMF, the Tg of PLA was reduced to 57.7 °C and 56.1 °C, respectively. It can be assumed that the presence of moisture in fibers leads to the degradation of PLA chains, resulting in the lower values of Tg (Paunonen et al 2020).…”

Section: Characterization Of Pla-based Biocompositesmentioning

confidence: 99%

Development of bio-based membranes for building envelope applications from poly(lactic acid) and cellulose microfibers

Chomachayi

Blanchet

Hussain

2022

BioRes

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A bio-based membrane was developed for building envelope applications. Biocomposites with enhanced water vapor permeability were fabricated based on poly(lactic acid) (PLA) and cellulose microfibers (CMF). To improve the interfacial adhesion between PLA and fibers, polyethylene glycol (PEG) was used as a compatibilizer for the modification of CMF. The properties of prepared PLA-based biocomposites were investigated in terms of their morphology, thermal stability, thermomechanical properties, and water vapor permeability. The morphological investigation showed the improved dispersion of cellulose fibers in the PLA matrix after modification of the bio-filler with PEG. The thermogravimetric analysis illustrated that the addition of modified CMFs increased the thermal stability of materials. Moreover, the water vapor permeability of PLA-based biocomposites was enhanced by adding modified CMFs to the PLA matrix. The results suggest that the utilization of PEG as a biopolymer compatibilizer represents a cost-effective and environmentally friendly method to improve the properties of PLA/CMF biocomposites. The developed membranes are potential materials for the fabrication of bio-based membranes with permeable properties that facilitate the transmission of entrapped water vapor through the building, eventually prolonging the service life of building envelope materials.

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“…21 Due to the recognition of the issues of natural and synthetic ACEM materials, a series of strategies had been proposed to enhance their surface functional properties. [22][23][24] Hongsriphan and Sanga 25 applied chitosan solutions with different concentrations (0.25, 0.50, 1.00, and 2.00% w/v) to deposit an antibacterial layer on the surface of PLA; the results showed that the chitosan coating had enhanced the water vapor transmission rate, mechanical properties, and antibacterial activity against Staphylococcus aureus and Escherichia coli. Stoleru et al 26 adopted cold radiofrequency plasma in a nitrogen atmosphere to first activate surface active sites of PLA, and then to graft chitosan molecular via carbodiimide chemistry, achieving stable antibacterial activity, surface performance and wet hydrophilicity properties.…”

Section: Introductionmentioning

confidence: 99%

Chitosan–gelatin enhanced antibacterial and biological properties of PLA and PGA braided threads for juvenile pseudomyopia treatment

Zhang

2021

Textile Research Journal

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Polylactic acid (PLA) and polyglycolide acid (PGA) have been the most widely used biomedical materials in the acupoint catgut-embedding therapy (ACET) fields. However, a lack of antibacterial and biological properties is a definite obstacle that hinders its further application in juvenile pseudomyopia treatment. Here, four different kinds of PLA and PGA threads were fabricated, and were then modified using chitosan–gelatin coating method. Afterwards, PLA and PGA braided threads were fully characterized with respect to structure, mechanical and biological properties. The results showed that the surface roughness of PLA and PGA had been greatly improved; FT-IR analysis proved the existence of chitosan and gelatin molecules, the modified PLA (M-PLA-a = 87.1° ± 1.5°, M-PLA-b = 83.5° ± 1.4°) had smaller contact angle values than that of non-modified PLA (PLA-a = 108.6° ± 2.6°, PLA-b = 116.2° ± 3.1°), and that of the modified PGA (M-PGA-a = 79.3° ± 3.2°, M-PGA-b = 73.8° ± 1.8°) was smaller compared with that of the non-modified PGA (PGA-a = 98.2° ± 1.7°, PGA-b = 83.5° ± 1.4°). Based on the mechanical testing results, the tensile property and flexibility of samples increased slightly, and their swelling behavior also increased correspondingly. All the prepared samples exhibited non-toxicity with cell viability of more than 75%, and samples M-PGA-b presented the largest cell attachment ratios. In sum, this work exhibited great potential in the ACET application for juvenile pseudomyopia treatment.

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Poly(lactic acid)/pulp fiber composites: The effect of fiber surface modification and hydrothermal aging on viscoelastic and strength properties

Cited by 11 publications

References 35 publications

Improving the Processability and Performance of Micronized Fiber-Reinforced Green Composites through the Use of Biobased Additives

Improving the Processability and Performance of Micronized Fiber-Reinforced Green Composites through the Use of Biobased Additives

Development of bio-based membranes for building envelope applications from poly(lactic acid) and cellulose microfibers

Chitosan–gelatin enhanced antibacterial and biological properties of PLA and PGA braided threads for juvenile pseudomyopia treatment

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