Mercerization effect on the properties of LDPE/PHB composites reinforced with castor cake

Rocha, Marisa Cristina Guimarães; Acevedo, Nancy Isabel Alvarez; Oliveira, Carlos Ivan Ribeiro de; Sanches, Maira Cunha; Coelho, Natália Nogueira

doi:10.1590/0104-1428.07720

Cited by 2 publications

(5 citation statements)

References 40 publications

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“…Lignin and hemicellulose act as a natural barrier for the protection of cellulose. The removal of these substances makes cellulose more accessible to the polymer matrix enhancing the mechanical anchorage [31]. The effects of castor bean cake mercerisation promote better interfacial adhesion between fibre and hydrophobic polymeric matrices improving the mechanical properties [24,[27][28][29].…”

Section: Resultsmentioning

confidence: 99%

“…As the fibers were submitted to the alkaline treatment, the colour of the castor cake changed becoming lighter due to the partial removal of the lignin. The Fourier-transform infrared spectroscopy (FTIR) pattern of the castor bean cake treated with different concentrations of NaOH solution, showed in a previous paper, showed a peak at 1639 cm −1 [31]. This absorption can be attributed to the carbonyl group of the ester linkage of lignin.…”

Section: Resultsmentioning

confidence: 99%

“…In a previous work, the effect of NaOH concentration on the structure of mercerised fibers and on the mechanical properties of LDPE and LDPE/PHB composites processed in a Haake mixer was evaluated. The results obtained showed that alkali treatment of castor cake with 5% NaOH solution is suitable for obtaining LDPE/PHB composites reinforced with castor bean cake with better tensile behaviour [31]. Extruders are a common tool used in the polymer industry.…”

Section: Introductionmentioning

confidence: 99%

“…This chemical treatment improves the interfacial properties between hydrophobic polymer matrices and lignocellulosic hydrophilic fibers. The type of alkali and its concentration as well as the source of cellulose have a strong influence on the degree of swelling, and therefore, on the degree of cellulose lattice transformation and on the properties obtained [26, 27, 30, 31]. In a previous work, the effect of NaOH concentration on the structure of mercerised fibers and on the mechanical properties of LDPE and LDPE/PHB composites processed in a Haake mixer was evaluated.…”

Section: Introductionmentioning

confidence: 99%

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Effect of mercerization on the properties and biodegradation behavior of LDPE and LDPE/PHB hybrid composites filled with castor bean cake

Rocha

Sanches

Acevedo

et al. 2023

Plastics, Rubber and Composites

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The aim of this study is to evaluate the effect of mercerization of castor cake on the tensile and biodegradation behaviour of LDPE and LDPE/PHB composites. Polymer composites filled with raw castor cake (CC) and castor cake treated with 5% NaOH solution (MCC) were developed and the tensile and biodegradation behaviour of the materials obtained were evaluated. The incorporation of mercerized fibers to polymeric matrices generated materials with an elastic modulus superior to that of LDPE and tensile strength values close to that of LDPE. The biodegradation rates of the polymer composites increased the addition of fibers. However, alkali-treated fibres had a less pronounced effect biodegradation rates of the polimeric composites, due to the lower tendency of mercerized fibers to absorb water. The 85/10/5 LDPE/PHB/CC composite showed greater mass loss, 3.1%, than the 85/10/5 LDPE/ PHB/ MCC composite, respectively, 0.9%, in 180 days.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of mercerization on the properties and biodegradation behavior of LDPE and LDPE/PHB hybrid composites filled with castor bean cake

Rocha

Sanches

Acevedo

et al. 2023

Plastics, Rubber and Composites

View full text Add to dashboard Cite

show abstract

“…However, the seeds for oil obtaining are only a small fraction of the plant, so some works about using Ricinus by-products have been performed. For example, the cake from oil extraction can be used to obtain a biopolymer based on proteins [22] or as filler for a PE/PHB composite [23].…”

Section: Introductionmentioning

confidence: 99%

Use of Ricinus communis shredded material as filler in rotational molded parts to improve the bio-disintegration behavior

et al. 2022

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This paper focuses on the use of castor oil plant (Ricinus communis) as filler in rotomolded parts using polyethylene (PE) and polylactic acid (PLA) as polymer matrixes. The vegetable shredded material was used in 5 and 10% weight following a dry blending procedure and then rotomolded to obtain cube test parts. This material was characterized to determine its chemical composition, thermal stability, and structure. The NaOH-treated material shows reduced hemicellulose content and higher thermal stability. Obtained composite materials were characterized in terms of mechanical (tensile, flexural, and impact) and thermal properties, morphology, and bio-disintegration behavior. The use of Ricinus as filler in rotomolded PE composite decreases, in general terms, mechanical properties of neat PE, while no significant changes in thermal or bio-disintegration properties are found. On the contrary, PLA composites show higher tensile strength and similar Young's modulus than the matrix, although with reduced flexural and impact properties. Alkali-treated Ricinus material produces parts with higher porosity and thus, lower mechanical properties than composites with untreated material. Finally, the incorporation of this vegetal material modifies to a great extent the thermal properties of the PLA matrix. The bio-disintegration rate increases due to the use of fibers, probably because of the higher moisture absorption of composites.

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Mercerization effect on the properties of LDPE/PHB composites reinforced with castor cake

Cited by 2 publications

References 40 publications

Effect of mercerization on the properties and biodegradation behavior of LDPE and LDPE/PHB hybrid composites filled with castor bean cake

Effect of mercerization on the properties and biodegradation behavior of LDPE and LDPE/PHB hybrid composites filled with castor bean cake

Use of Ricinus communis shredded material as filler in rotational molded parts to improve the bio-disintegration behavior

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