Polyhydroxybutyrate (PHB)-based blends and composites

Moreira, Juliana Botelho; Kuntzler, Suelen Goettems; Vaz, Bruna da Silva; Silva, Cleber Klasener da; Costa, Jorge Alberto Vieira; Morais, Michele Greque de

doi:10.1016/b978-0-12-823791-5.00007-7

Cited by 13 publications

(8 citation statements)

References 113 publications

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“…The melting point of PHBCS0 was 268.3 °C with the crystallinity at 81%. These results are similar to the values in the literature [ 8 , 11 , 21 ]. Table 4 shows the decrease in enthalpy fusion from 125 to 76 J/g.…”

Section: Resultssupporting

confidence: 92%

“…In Figure 6 , a single degradation’s temperature was shown in the TGA/DTA plots of all PHB/CS composites after blending and shifted to the right once the content of CS increased. This is because the proper miscibility occurred between PHB and CS at different compositions, and the addition of CS disrupted the regularity of PHB and reduced the crystallinity [ 8 , 11 , 13 , 21 ]. This can be confirmed by the reduction in H m in the DSC curves.…”

Section: Discussionmentioning

confidence: 99%

“…However, the mechanically inferior feature of CS has limited its usage. Therefore, it is reasonable that both PHB and CS showed mutual complementary potentials based on their properties [ 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

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Electrospun PHB/Chitosan Composite Fibrous Membrane and Its Degradation Behaviours in Different pH Conditions

Zhou

et al. 2022

JFB

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Peripheral nerve injury (PNI) is a neurological disorder that causes more than 9 million patients to suffer from dysfunction of moving and sensing. Using biodegradable polymers to fabricate an artificial nerve conduit that replicates the environment of the extracellular matrix and guides neuron regeneration through the damaged sites has been researched for decades and has led to promising but primarily pre-clinical outcomes. However, few peripheral nerve conduits (PNCs) have been constructed from controllable biodegradable polymeric materials that can maintain their structural integrity or completely degrade during and after nerve regeneration respectively. In this work, a novel PNC candidate material was developed via the electrospinning of polyhydroxy butyrate/chitosan (PHB/CS) composite polymers. An SEM characterisation revealed the resultant PHB/CS nanofibres with 0, 1 and 2 wt/v% CS had less and smaller beads than the nanofibres at 3 wt/v% CS. The water contact angle (WCA) measurement demonstrated that the wettability of PHB/CS electrospun fibres was significantly improved by additional CS. Furthermore, both the thermogravimetric analysis (TGA) and differentiation scanning calorimetry (DSC) results showed that PHB/CS polymers can be blended in a single phase with a trifluoracetic solvent in all compositions. Besides, the reduction in the degradation temperature (from 286.9 to 229.9 °C) and crystallinity (from 81.0% to 52.1%) with increasing contents of CS were further proven. Moreover, we found that the degradability of the PHB/CS nanofibres subjected to different pH values rated in the order of acidic > alkaline > phosphate buffer solution (PBS). Based on these findings, it can be concluded that PHB/CS electrospun fibres with variable blending ratios may be used for designing PNCs with controlled biodegradability.

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Section: Resultssupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

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Electrospun PHB/Chitosan Composite Fibrous Membrane and Its Degradation Behaviours in Different pH Conditions

Zhou

et al. 2022

JFB

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“…The chemical structure of PHB contains a hydrophobic methyl group and hydrophilic ester groups, but in general, PHB is a hydrophobic polymer [ 72 ]. The control of its hydrophilicity is an important task, the solution to which can greatly expand the areas of biomedical application of this polymer [ 73 ].…”

Section: Discussionmentioning

confidence: 99%

Biomimetic Materials Based on Poly-3-hydroxybutyrate and Chlorophyll Derivatives

Tyubaeva,

Gasparyan,

Romanov

et al. 2023

Polymers

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Electrospinning of biomimetic materials is of particular interest due to the possibility of producing flexible layers with highly developed surfaces from a wide range of polymers. Additionally, electrospinning is characterized by a high simplicity of implementation and the ability to modify the produced fibrous materials, which resemble structures found in living organisms. This study explores new electrospun materials based on polyhydroxyalkanoates, specifically poly-3-hydroxybutyrate, modified with chlorophyll derivatives. The research investigates the impact of chlorophyll derivatives on the morphology, supramolecular structure, and key properties of nonwoven materials. The obtained results are of interest for the development of new flexible materials with low concentrations of chlorophyll derivatives.

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“…The wide adoption of PHBHs in the industry is not immediate, since their physicochemical properties are not competitive with those of the majority of conventional polymers of fossil origin. That is the main driver for this work, which aims to improve the properties of PHBH by the addition of nanoparticles [37], as stated before. That is why 5000 As presented in Figure 16b (see Table S7) the results clearly show that the environmental impacts are not sensitive to the addition of such small amounts of different reinforcements.…”

Section: Sensitivity Analysis: Nanoreinforcements To Enhance the Prop...mentioning

confidence: 99%

Sustainable PHBH–Alumina Nanowire Nanocomposites: Properties and Life Cycle Assessment

et al. 2022

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Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBH) is a bio-based polyester with the potential to replace some common polymers of fossil origin. However, PHBH presents serious limitations, such as low stiffness, tendency to undergo crystallization over long time periods and low resistance to thermal degradation during processing. In this work, we studied the use of alumina nanowires to generate PHBH–alumina nanocomposites, modifying the properties of PHBH to improve its usability. Solvent casting and melt blending were used to produce the nanocomposites. Then, their physicochemical properties and aquatic toxicity were measured. Finally, LCA was used to evaluate and compare the environmental impacts of several scenarios relevant to the processing and end of life (EoL) conditions of PHBHs. It was observed that, at low concentrations (3 wt.%), the alumina nanowires have a small positive impact on the stiffness and thermal degradation for the samples. However, for higher concentrations, the observed effects differed for each of the applied processing techniques (solvent casting or melt blending). The toxicity measurements showed that PHBH alone and in combination with alumina nanowires (10 wt.%) did not produce any impact on the survival of brine shrimp larvae after 24 and 48 h of exposure. The 18 impact categories evaluated by LCA allowed defining the most environmentally friendly conditions for the processing and EoL of PHBHs, and comparing the PHBH-related impacts to those of some of the most common fossil-based plastics. It was concluded that the preferable processing technique for PHBH is melt blending and that PHBH is unquestionably more environmentally friendly than every other analyzed plastic.

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Polyhydroxybutyrate (PHB)-based blends and composites

Cited by 13 publications

References 113 publications

Electrospun PHB/Chitosan Composite Fibrous Membrane and Its Degradation Behaviours in Different pH Conditions

Electrospun PHB/Chitosan Composite Fibrous Membrane and Its Degradation Behaviours in Different pH Conditions

Biomimetic Materials Based on Poly-3-hydroxybutyrate and Chlorophyll Derivatives

Sustainable PHBH–Alumina Nanowire Nanocomposites: Properties and Life Cycle Assessment

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