Biodegradation in Soil of the PHB/Wood Flour (80/20) and PHB/Sisal Fiber (80/20) Tubes

Casarin, Suzan Aline; Rodrigues, Cássia Priscila; Júnior, Osvaldo Francisco de Souza; Rosário, Francisco; Agnelli, José Augusto Marcondes

doi:10.1590/1980-5373-mr-2016-0904

Cited by 11 publications

(10 citation statements)

References 5 publications

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“…loading was further increased to 25 wt% [17]. Contradictory results were reported in studies on the biodegradation of PHBV/peach palm particle composites [18] and PHB/wood flour composites [19,20] in soil under an indoor environment. However, all these studies have shown that a higher biodegradation rate, based on weight loss and visual inspection, was observed from the composites with higher fibre contents.…”

Section: Accepted Manuscriptmentioning

confidence: 81%

Insights into the biodegradation of PHA / wood composites: Micro- and macroscopic changes

Chan

Vandi

Pratt

et al. 2019

Sustainable Materials and Technologies

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Section: Accepted Manuscriptmentioning

confidence: 81%

Insights into the biodegradation of PHA / wood composites: Micro- and macroscopic changes

Chan

Vandi

Pratt

et al. 2019

Sustainable Materials and Technologies

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“…After 5 months, it was found that the composites with higher wood content degraded faster than neat PHBV in soil, based on visual analysis [Batista et al, 2010]. Similar results were also obtained in other studies, with one finding that the introduction of WF accelerated the biodegradation of PHB/WF composites as evidenced by a larger weight loss upon soil burial after 12 weeks [Wu, 2006], and another reporting that the mechanical loss from PHB/WF composites (80/20) was more pronounced than that of neat P(3HB) after 60 days of soil burial [Casarin et al, 2017]. These investigations all focused on the biodegradation aspects and lack data on the influence of soil burial on mechanical durability and the interconnections between these properties.…”

Section: Introductionsupporting

confidence: 86%

Development of bio-derived and biodegradable polyhydroxyalkanoate (PHA)-based wood plastic composites (WPCs)

Chan¹

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In response to the concerns over the accumulation of plastic wastes, the wood plastic composites (WPCs) industry has been in particular interest in replacing the petroleum-based polymer matrices with biopolymers. Polyhydroxyalkanoates (PHAs) are potential candidates as these biopolymers can be degraded readily under ambient conditions and can be synthesised intracellularly by bacteria from renewable/waste resources. Their low melt viscosity can also be an advantage in processing. While there is a considerable body of literature on PHA-based WPCs, the majority of the studies have focused on mechanical property optimisation but their mechanical stability and biodegradability were poorly understood. Therefore, this thesis explored the fundamental characteristics of PHA/wood flour (WF) composites with focus on the micro-structure-property relationship and end-of-life behaviour. The extrusion processing setup for composites of a commercially available poly(3-hydroxybutyrateco-3-hydroxyvalerate) (PHBV) and WF was first optimised. A logical next step involved the optimisation of mechanical properties through the use of carefully selected chemical compatibilisers and additives. The expected benefits of chemical compatibilisers were outweighed when compared to the alteration of micro-structure by the non-reactive micro-sized talc filler. An innovative approach for improving processabilty and toughness was then investigated through the inclusion of tougher PHA copolymers including an in-house mixed culture PHBV, for further cost reduction. The potential of this strategy was demonstrated by the improvement, albeit marginal, in composite strain at break. The real-time studies of mechanical stability and biodegradability brought new insights to this biocomposite. Uncoated PHBV/WF composites were stable under indoor ambient conditions for at least 1 year. Exposure to outdoor environment, however, led to reduced mechanical stability. It was determined to be solely associated with the mould growth on the exposed hygroscopic wood particles. The unique advantage of PHBV/WF composites was demonstrated with respect to their significantly higher biodegradation rate in soil than PLA/WF and PE/WF composites. The presence of wood accelerated the biodegradation and reduced the mechanical stability of the composites in soil. A micro-mechanical schematic model was used to illustrate the phenomena. In addition, it was shown that PHA-based WPCs are physically and mechanically stable unless they are exposed to colonies of microorganisms such as moisture-induced mould or those found in soil communities. Overall, this thesis provided better insights into the strong correlations between the micro-structure and the properties of PHA-based WPCs, both initially and in the long-term. Wood particles played an important role in both their performance and biodegradation. To conclude, this thesis has paved the way for development of novel bio-derived and biodegradable composites which provide utility what would otherwise be a low-value stream from the f...

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“…Por conta disso, alguns pesquisadores tentaram desenvolver tubetes biodegradáveis com algum tipo de matriz lignocelulósica, como, por exemplo, bagaço da cana-de-açúcar (DIAS, 2011), papel reciclado (CARDOSO et al, 2012), amido (CARASCHI;LEÃO, 1999), pó de madeira (CARASCHI; LEÃO, 2000;ARTHUR JÚNIOR, 2011;CASARIN et al, 2017;ANDERSON et al, 2013), dentre outros.…”

Section: Revista Ambientaleunclassified

Evaluation of the morphological parameters of native species of the Atlantic Forest in biodegradable tubes

Costa

Almeida

Castro

2020

RAmb.

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Alguns estudos relatam que propostas de tubetes biodegradáveis não suportavam as condições ambientais nos viveiros ou não favoreciam condições necessárias ao crescimento das mudas, implicando nos parâmetros morfológicos necessários a atingir a qualidade padrão de ir à campo. O objetivo deste estudo foi avaliar os parâmetros morfológicos de mudas nativas da Mata Atlântica em tubetes biodegradáveis em viveiro florestal. Foram injetados tubetes biodegradáveis de polietileno de alta densidade, oxibiodegradante orgânico e micropartículas de casca de arroz. Durante 6 meses os tubetes foram utilizados para a produção de mudas nativas. Após este período, foram analisados: altura (H), diâmetro do colo (DC), massa seca da parte aérea (MSPA), massa seca da raiz (MSR), índice de qualidade de Dickson (IQD) e índice de Robustez (IR). Observou-se que as mudas de aroeira e tamboril não apresentaram diferença estatística para as variáveis estudadas. As mudas de genipapo apresentaram diferença estatística para a MSPA e MSR entre os tipos de tubetes. Portanto, os tubetes biodegradáveis podem ser utilizados para a produção de mudas em viveiro florestal, pois não influenciaram nos parâmetros de crescimento e desenvolvimento de mudas de espécies florestais nativas.

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Biodegradation in Soil of the PHB/Wood Flour (80/20) and PHB/Sisal Fiber (80/20) Tubes

Cited by 11 publications

References 5 publications

Insights into the biodegradation of PHA / wood composites: Micro- and macroscopic changes

Insights into the biodegradation of PHA / wood composites: Micro- and macroscopic changes

Development of bio-derived and biodegradable polyhydroxyalkanoate (PHA)-based wood plastic composites (WPCs)

Evaluation of the morphological parameters of native species of the Atlantic Forest in biodegradable tubes

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