Desenvolvimento e caracterização de biocompósitos de polihidroxibutirato e fibra de bananeira

Nery, Tatiana Barreto Rocha; Santos, Zora Ionara Gama dos; José, Nadia Mamede

doi:10.1590/s1517-707620180004.0591

Cited by 8 publications

(5 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Given the hydroxyl functional groups on the ends of natural fibers that confer them a hydrophilic behavior, there is a polarity variation between the fiber–matrix interface ( Figure 1 ), contributing to their poor adhesion [ 9 ]. In the case of PHA matrices, limited mechanical improvement has been reported in the literature when cellulose-based fibers were used as reinforcement [ 10 , 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Potential of Cellulose Microfibers for PHA and PLA Biopolymers Reinforcement

2020

View full text Add to dashboard Cite

Cellulose nanocrystals (CNC) have attracted the attention of many engineering fields and offered excellent mechanical and physical properties as polymer reinforcement. However, their application in composite products with high material demand is complex due to the current production costs. This work explores the use of cellulose microfibers (MF) obtained by a straightforward water dispersion of kraft paper to reinforce polyhydroxyalkanoate (PHA) and polylactic acid (PLA) films. To assess the influence of this type of filler material on the properties of biopolymers, films were cast and reinforced at different scales, with both CNC and MF separately, to compare their effectiveness. Regarding mechanical properties, CNC has a better reinforcing effect on the tensile strength of PLA samples, though up to 20 wt.% of MF may also lead to stronger PLA films. Moreover, PHA films reinforced with MF are 23% stronger than neat PHA samples. This gain in strength is accompanied by an increment of the stiffness of the material. Additionally, the addition of MF leads to an increase in the crystallinity of PHA that can be controlled by heat treatment followed by quenching. This change in the crystallinity of PHA affects the hygroscopicity of PHA samples, allowing the modification of the water barrier properties according to the required features. The addition of MF to both types of polymers also increases the surface roughness of the films, which may contribute to obtaining better interlaminar bonding in multi-layer composite applications. Due to the partial lignin content in MF from kraft paper, samples reinforced with MF present a UV blocking effect. Therefore, MF from kraft paper may be explored as a way to introduce high fiber concentrations (up to 20 wt.%) from other sources of recycled paper into biocomposite manufacturing with economic and technical benefits.

show abstract

Section: Introductionmentioning

confidence: 99%

Potential of Cellulose Microfibers for PHA and PLA Biopolymers Reinforcement

2020

View full text Add to dashboard Cite

show abstract

“…Polyhydroxybutyrate (PHB) is a biodegradable thermoplastic synthesized by submerged fermentation from renewable raw materials. It is a polyester composed of highly crystalline, rigid and brittle linear elastomers with chemical resistance to hydrolysis [130]. PHB has a methyl functional group and an ester linking group that provides the characteristics mentioned above [131].…”

Section: Bioplasticsmentioning

confidence: 99%

Recovery of Banana Waste-Loss from Production and Processing: A Contribution to a Circular Economy

et al. 2021

View full text Add to dashboard Cite

Banana is a fruit grown mainly in tropical countries of the world. After harvest, almost 60% of banana biomass is left as waste. Worldwide, about 114.08 million metric tons of banana waste-loss are produced, leading to environmental problems such as the excessive emission of greenhouse gases. These wastes contain a high content of paramount industrial importance, such as cellulose, hemicellulose and natural fibers that various processes can modify, such as bacterial fermentation and anaerobic degradation, to obtain bioplastics, organic fertilizers and biofuels such as ethanol, biogas, hydrogen and biodiesel. In addition, they can be used in wastewater treatment methods by producing low-cost biofilters and obtaining activated carbon from rachis and banana peel. Furthermore, nanometric fibers commonly used in nanotechnology applications and silver nanoparticles useful in therapeutic cancer treatments, can be produced from banana pseudostems. The review aims to demonstrate the contribution of the recovery of banana production waste-loss towards a circular economy that would boost the economy of Latin America and many other countries of emerging economies.

show abstract

“…A reinforcing effect on the mechanical properties was evident in the tensile, bending, and impact tests of the biocomposite containing 5% fibre. However, when the fibre content was increased to 10%, the reinforcing effect was maintained to the PHB matrix but in a smaller proportion when compared to the biocomposite with 5% fibre, due to a lower interfacial interaction between the matrix and the fibres from the lack of fibre distribution in the matrix and generation of force centres (see Table 9) [117].…”

Section: Polymers Of Microbial Originmentioning

confidence: 99%

“…Similarly, the thermal degradation temperature was reported through thermogravimetric analysis (TGA) and the Shore D hardness, showing that the addition of fibre contributes to greater thermal stability, going from 270 • C in the pure PHB to values between 300 and 305 • C in the two biocomposites, while the hardness decreases as the fibre content in the biocomposite increases, going from 81.7 Shore D in the pure PHB to 72.3 Shore D in the biocomposite with 10% fibre [117].…”

Section: Polymers Of Microbial Originmentioning

confidence: 99%

Potential Uses of Musaceae Wastes: Case of Application in the Development of Bio-Based Composites

2021

View full text Add to dashboard Cite

The Musaceae family has significant potential as a source of lignocellulosic fibres and starch from the plant’s bunches and pseudostems. These materials, which have traditionally been considered waste, can be used to produce fully bio-based composites to replace petroleum-derived synthetic plastics in some sectors such as packaging, the automotive industry, and implants. The fibres extracted from Musaceae have mechanical, thermal, and physicochemical properties that allow them to compete with other natural fibres such as sisal, henequen, fique, and jute, among others, which are currently used in the preparation of bio-based composites. Despite the potential use of Musaceae residues, there are currently not many records related to bio-based composites’ developments using starches, flours, and lignocellulosic fibres from banana and plantain pseudostems. In this sense, the present study focusses on the description of the Musaceae components and the review of experimental reports where both lignocellulosic fibre from banana pseudostem and flour and starch are used with different biodegradable and non-biodegradable matrices, specifying the types of surface modification, the processing techniques used, and the applications achieved.

show abstract

Desenvolvimento e caracterização de biocompósitos de polihidroxibutirato e fibra de bananeira

Cited by 8 publications

References 8 publications

Potential of Cellulose Microfibers for PHA and PLA Biopolymers Reinforcement

Potential of Cellulose Microfibers for PHA and PLA Biopolymers Reinforcement

Recovery of Banana Waste-Loss from Production and Processing: A Contribution to a Circular Economy

Potential Uses of Musaceae Wastes: Case of Application in the Development of Bio-Based Composites

Contact Info

Product

Resources

About