Lignocellulosic Materials as Reinforcement of Polyhydroxybutyrate and its Copolymer with Hydroxyvalerate: A Review

Robledo‐Ortíz, Jorge R.; González‐López, Martín Esteban; Campo, Alan S. Martín del; Pérez‐Fonseca, Aida Alejandra

doi:10.1007/s10924-020-01979-2

Cited by 17 publications

(9 citation statements)

References 93 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The maximum degradation temperatures of PHB P226-based composites were similar to those of the pristine matrix (around 280 °C), but for composites with PHB P209E ( Figure 11 A), the incorporation of high contents of cellulose fibers, e.g., 40 wt.% load, increased the maximum thermal degradation from 236 °C to over 280 °C. This increase proves that, although the compatibility of PHB with the micronized fibers is not excellent, as seen in the SEM micrographs, there is some degree of interfacial adhesion between them [ 35 ]. Even if increases in the thermal stability have been reported in other studies, as is the example of PHB reinforced with agave fibers [ 39 ], the effects of the fiber incorporation on the thermal stability of PHB-based composites are debatable, with most studies showing decreases on the stability upon incorporation of natural fibers such as piassava [ 67 ], flax [ 66 ] almond shell, or rice husk [ 68 ].…”

Section: Resultsmentioning

confidence: 96%

“…This phenomenon has been extensively described in the literature and is usually attributed to the different phobic nature of the constituents [ 32 , 33 , 34 ]. However, due to the carboxylic and hydroxyl end groups of PHB and PLA, there is a high degree of compatibility between these matrices and cellulose fibers when compared with common thermoplastic matrices, such as PP or PE [ 15 , 35 ]. The fact that fractured fibers are more prevalent on the micrographs than the pulled-out fibers is also evidence of such a compatibility.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Effect of the Micronization of Pulp Fibers on the Properties of Green Composites

et al. 2021

View full text Add to dashboard Cite

Green composites, composed of bio-based matrices and natural fibers, are a sustainable alternative for composites based on conventional thermoplastics and glass fibers. In this work, micronized bleached Eucalyptus kraft pulp (BEKP) fibers were used as reinforcement in biopolymeric matrices, namely poly(lactic acid) (PLA) and poly(hydroxybutyrate) (PHB). The influence of the load and aspect ratio of the mechanically treated microfibers on the morphology, water uptake, melt flowability, and mechanical and thermal properties of the green composites were investigated. Increasing fiber loads raised the tensile and flexural moduli as well as the tensile strength of the composites, while decreasing their elongation at the break and melt flow rate. The reduced aspect ratio of the micronized fibers (in the range from 11.0 to 28.9) improved their embedment in the matrices, particularly for PHB, leading to superior mechanical performance and lower water uptake when compared with the composites with non-micronized pulp fibers. The overall results show that micronization is a simple and sustainable alternative for conventional chemical treatments in the manufacturing of entirely bio-based composites.

show abstract

Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Effect of the Micronization of Pulp Fibers on the Properties of Green Composites

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Agriculture wastes are an important type of lignocellulosic biomass, such as bagasse, palm residues, corncob, and straw, among several others [ 1 , 3 , 4 ]. These lignocellulosic materials have been widely used to produce composites due to their advantages of possessing biodegradability, a low cost, a lower density, and less abrasiveness than synthetic fibers [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

Valorization of Sugarcane Straw for the Development of Sustainable Biopolymer-Based Composites

et al. 2021

Self Cite

View full text Add to dashboard Cite

Sugarcane straw (SCS) is a common agro-industrial waste that is usually incinerated or discarded in fields after harvesting, increasing the importance of developing added-value applications for this residue. In this study, sustainable biocomposites were produced, and the effect of sugarcane straw as a filler/reinforcement of commercial biopolymers was evaluated. Biocomposites were prepared using polylactic acid (PLA), polyhydroxybutyrate (PHB), polyhydroxybutyrate-co-hydroxyvalerate (PHBV), or green polyethylene (Green-PE) with different fiber contents (20, 30, and 40 wt.%). Dry-blending followed by compression molding was used for the biocomposites preparation. The results showed that PLA, PHB, and PHBV biocomposites retained the same impact strength as the neat matrices, even with 40 wt.% of sugarcane straw. The flexural and tensile modulus of PLA, PHB, and PHBV biocomposites increased with 20% of SCS, whereas, in Green-PE biocomposites, these properties increased at all fiber contents. Since any compatibilizer was used, both the flexural and tensile strength decreased with the addition of SCS. However, even with the highest content of SCS, the tensile and flexural strength values were around 20 MPa, making these materials competitive for specific industrial applications.

show abstract

“…However, the environmental concern urges to replace petroleum‐based WPCs that are only partially biodegradable and difficult to recycle. In this sense, biopolymers emerged as one of the most attractive alternatives for replacing conventional polymers 8,9 …”

Section: Introductionmentioning

confidence: 99%

“…The most common synthesis route is the ring‐opening polymerization of lactide 13 . On the other hand, PHB is obtained by microbial fermentation, being synthesized and accumulated by bacteria as energy storage under nutritional stress conditions 9,12,14,15 . Nevertheless, these biopolymers have some significant drawbacks, such as low thermal stability and brittleness, which can be overcome by blending them together.…”

Section: Introductionmentioning

confidence: 99%

Influence of the blending method over the thermal and mechanical properties of biodegradable polylactic acid/polyhydroxybutyrate blends and their wood biocomposites

Pérez‐Fonseca

Herrera-Carmona

González‐García

et al. 2021

Polymers for Advanced Techs

Self Cite

View full text Add to dashboard Cite

This study focused on the effect of the processing method on the thermal, mechanical, and biodegradation properties of polylactic acid/polyhydroxybutyrate (PLA/PHB) blends and their wood biocomposites. The blending techniques were dry‐blending or twin‐screw extrusion, both followed by compression molding. PLA/PHB blends were prepared using 15 and 25% wt. of PHB and biocomposites with 20 and 30% wt. of wood particles. Moreover, a compatibilizer was used during the extrusion process to achieve better matrix‐fiber adhesion. The results showed that the crystallinity of PLA significantly increased with PHB and wood, especially after twin‐screw extrusion. The best results in tensile, flexural, and impact strength were obtained with the extruded and compatibilized PLA/PHB blends, with values higher than the neat biopolymers. The compatibilized biocomposite with 15% wt. PHB, and 20% wt. wood particles showed higher tensile, flexural, and impact properties than PLA. The biodegradation test showed that all samples were disintegrated (above 40%) after 40 days in compost medium, observing slight decreases in the biodegradation rate when PHB or wood particles were added. Even when the lower mechanical properties were obtained with the dry‐blending technique, they are still competitive for different applications, providing the possibility to produce blends and biocomposites, avoiding the extrusion process that requires more energy consumption and longer processing times.

show abstract

Lignocellulosic Materials as Reinforcement of Polyhydroxybutyrate and its Copolymer with Hydroxyvalerate: A Review

Cited by 17 publications

References 93 publications

Effect of the Micronization of Pulp Fibers on the Properties of Green Composites

Effect of the Micronization of Pulp Fibers on the Properties of Green Composites

Valorization of Sugarcane Straw for the Development of Sustainable Biopolymer-Based Composites

Influence of the blending method over the thermal and mechanical properties of biodegradable polylactic acid/polyhydroxybutyrate blends and their wood biocomposites

Contact Info

Product

Resources

About