Absorção de água, solubilidade em água, propriedades mecânicas e morfológicas de compósitos de glúten de milho e poli(hidroxibutirato-co-valerato) (PHBV) reforçados com fibras de coco verde

Corradini, Elisângela; Ferreira, Fábio Cop; Agnelli, José Augusto Marcondes; Marconcini, J. M.; Mattoso, Luiz H. C.; Rosa, Morsyleide de Freitas

doi:10.4322/polimeros.2014.001

Cited by 3 publications

(2 citation statements)

References 19 publications

(20 reference statements)

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“…A good knowledge of the impact of each constituent on the water transfer in vegetal fiber‐based composites and especially water in its vapor form is required to design materials tailored to targeted applications. A significant number of publications have already been devoted to the study of liquid water transfer in biocomposites and constituting biopolymers and fibers . For example, Srubar et al, demonstrated that the presence of hydrophilic wood fibers in composites increased both the water content at equilibrium and the identified liquid diffusion coefficient.…”

Section: Introductionmentioning

confidence: 99%

Water vapor sorption and diffusion in wheat straw particles and their impact on the mass transfer properties of biocomposites

Wolf

Guillard

Angellier‐Coussy

et al. 2016

J of Applied Polymer Sci

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This work intends to decipher the role of hydrophilic fillers, wheat straw fibers (WSF), on the water vapor transfer properties (sorption and diffusion) of biocomposites based on poly(3-hydroxybutyrate-co-3-hydroxyvalerate), (PHBV) as matrix. Transfer in biocomposites, measured using dynamical vapor sorption measurement, is correlated to the transfer properties of each individual constituent and to the specific structural arrangements induced by the presence of particles inside the matrix. Increasing amounts of WSF particles in the PHBV matrix lead to an increase of the water vapor sorption (WVS) of the resulting composites. This is attributed to the high sorption of hydrophilic WSF as compared to that of the neat PHBV matrix. Water vapor diffusion in composites (around 0.13 × 10−11 m2 s−1 at 20°C whatever the filler content) is always lower than in the neat matrix (0.26 × 10−11 m2 s−1) although wheat straw displays high diffusivity values (1.84 × 10−11 m2 s−1). Such unexpected behavior is related to (1) changes of structure and properties of the WSF particle once embedded in the PHBV matrix, (2) changes in the polymer matrix structure and properties in contact with fibers, and also (3) to the representativeness of the filler diffusivity, which is difficult to appraise

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Section: Introductionmentioning

confidence: 99%

Water vapor sorption and diffusion in wheat straw particles and their impact on the mass transfer properties of biocomposites

Wolf

Guillard

Angellier‐Coussy

et al. 2016

J of Applied Polymer Sci

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“…Both compression molding of thin composite sheets and processing on mini extruders and mini injection molding machines are limited processes due to the fact that they are difficult to relate to actual processing conditions. Composites with a PHBV matrix filled with fibers of plant origin such as coconut [34][35][36][37][38], bamboo [39][40][41][42][43][44][45][46], abaca [47,48], pineapple [32,49] and sisal [50][51][52] have been the subject of research.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Alkali Treatment of Flax and Hemp Fibers on the Properties of PHBV Based Biocomposites

2021

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This study assessed the impact of alkali treatment of hemp and flax fibers on mechanical properties (determined by means of the uniaxial tensile test, impact tensile strength test and hardness test), processing properties (the course of the extrusion and injection process) and usable properties (shrinkage of molded pieces, degree of water absorption) of biocomposites on the base of poly (3-hydroxybutyric-co-3-hydroxyvaleric acid) (PHBV) biopolymer. For this purpose, 1 mm of length flax and hemp fibers was surface-modified by means of aqueous solution of NaOH (sodium hydroxide) with concentrations of 2%, 5% and 10%. The composites were made using the extrusion technology. The test specimens were produced by injection molding technology. In total, eight types of biocomposites with modified and non-modified fibers were produced, and each biocomposite contained the same filler content (15 wt.%). Their properties were compared in some cases with pure PHBV polymer. In the case of biocomposites filled with hemp fibers, it was noted that an increase of the alkalizing solution concentration improved most of the tested properties of the obtained biocomposites. On the other hand, in the case of flax fibers, there was a significant decrease in most of the mechanical properties tested for the composite containing fibers etched by 10% NaOH solution. The obtained results were verified by examining fibers and the destroyed specimens with a scanning electron microscope (SEM) and an optical microscope, which confirmed, especially, the significant geometry changes of the flax fibers etched by 10% NaOH solution. This procedure also resulted in a significant change of processing properties—a composite of this fiber type required about 20 °C lower temperature during the extrusion and injection molding process in order to obtain the right product. These results lead to the important conclusion that for each filler of the plant-origin and polymer matrix, the fiber alkalization method should be selected individually in order to improve the specific properties of biocomposites.

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The Influence of Chosen Plant Fillers in PHBV Composites on the Processing Conditions, Mechanical Properties and Quality of Molded Pieces

et al. 2021

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This work is inspired by the current European policies that aim to reduce plastic waste. This is especially true of the packaging industry. The biocomposites developed in the work belong to the group of environmentally friendly plastics that can reduce the increasing costs of environmental fees in the future. Three types of short fibers (flax, hemp and wood) with a length of 1 mm each were selected as fillers (30% mass content in PHBV). The biocomposites were extruded and then processed by the injection molding process with the same technical parameters. The samples obtained in this way were tested for mechanical properties and quality of the molded pieces. A significant improvement of some mechanical properties of biocomposites containing hemp and flax fibers and quality of molded pieces was obtained in comparison with pure PHBV. Only in the case of wood–PHBV biocomposites was no significant improvement of properties obtained compared to biocomposites with other fillers used in this research. The use of natural fibers, in particular hemp fibers as a filler in the PHBV matrix, in most cases has a positive effect on improving the mechanical properties and quality of molded pieces. In addition, it should be remembered that the obtained biocomposites are of natural origin and are fully biodegradable, which are interesting and desirable properties that are a part of the current trend regarding the production and commercialization of modern biomaterials.

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Absorção de água, solubilidade em água, propriedades mecânicas e morfológicas de compósitos de glúten de milho e poli(hidroxibutirato-co-valerato) (PHBV) reforçados com fibras de coco verde

Cited by 3 publications

References 19 publications

Water vapor sorption and diffusion in wheat straw particles and their impact on the mass transfer properties of biocomposites

Water vapor sorption and diffusion in wheat straw particles and their impact on the mass transfer properties of biocomposites

Influence of the Alkali Treatment of Flax and Hemp Fibers on the Properties of PHBV Based Biocomposites

The Influence of Chosen Plant Fillers in PHBV Composites on the Processing Conditions, Mechanical Properties and Quality of Molded Pieces

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