Influence of Fibers on the Mechanical Properties of Cassava Starch Foams

Carr, Laura Gonçalves; Parra, D.F.; Ponce, Patricia; Lugão, Ademar B.; Büchler, Pedro Maurício

doi:10.1007/s10924-006-0008-5

Cited by 56 publications

(29 citation statements)

References 15 publications

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“…Fiber accumulation was observed (arrow 1), resulting in a non-homogeneous structure (Fig. 3), as also reported by Carr et al (2006), who related this non-homogeneity to a decrease in the compression strength of the foams, as discussed below. According to others researchers (Moraru and Kokini, 2003;Preechawong et al, 2004), the opened cell structure of foams was a result of the venting of large amount of water molecules when the starchy polymer emerged from the extruder die.…”

Section: Resultssupporting

confidence: 81%

“…These results agreed with the density values discussed above and could be explained as the same way. Besides, according to other authors (Carr et al, 2006;Cinelli et al, 2006), some vegetable fibers act as a reinforcing material only at low concentration levels, and the increase in fiber content results in the foams with higher densities and lower EI. The presence of fibers in the foam formulation is responsible for an increase in the viscosity of this mixture, which causes a less expandable material, a smaller average cell size, a thicker cell wall, and higher density .…”

Section: Resultsmentioning

confidence: 84%

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Biodegradable foams based on starch, polyvinyl alcohol, chitosan and sugarcane fibers obtained by extrusion

Debiagi

Mali

Grossmann

et al. 2011

Braz. arch. biol. technol.

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Biodegradable foams made from cassava starch, polyvinyl alcohol (PVA), sugarcane bagasse fibers and chitosan were obtained by extrusion. The composites were prepared with formulations determined by a constrained ternary mixtures experimental design, using as variables: (X 1 ) starch / PVA (100 -70%), (X 2 ) chitosan (0 -2%) and (X 3 ) fibers from sugar cane (0 -28%). The effects of varying proportions of these three components on foam properties were studied, as well the relationship between their properties and foam microstructure. The addition of starch/PVA in high proportions increased the expansion index and mechanical resistance of studied foams. Fibers addition improved the expansion and mechanical properties of the foams.There was a trend of red and yellow colors when the composites were produced with the highest proportions of fibers and chitosan, respectively. All the formulations were resistant to moisture content increase until 75% relative humidity of storage.

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Section: Resultssupporting

confidence: 81%

Section: Resultsmentioning

confidence: 84%

Biodegradable foams based on starch, polyvinyl alcohol, chitosan and sugarcane fibers obtained by extrusion

Debiagi

Mali

Grossmann

et al. 2011

Braz. arch. biol. technol.

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show abstract

“…As described by Kaisangsri et al [37] the addition of plant fibers to foamed materials based on starch improved the mechanical characteristic of these products, especially as bending resistance and compression resistance The opposite characteristics were found by Carr et al [38] if manioc fibers was used as an additive and decreased mecanical strength of foamed materials was observed. The increase in fibers quantity has resulted in foams with higherdensity and less flexibility, whatever the fiber type.…”

Section: Introductionmentioning

confidence: 82%

Effect of PVA and PDE on selected structural characteristics of extrusion-cooked starch foams

et al. 2018

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ObstractThe aim of this work was to determine selected physical properties of biodegradable thermoplastic starch (TPS) filling foams manufactured by extrusion-cooking technique from different combinations of potato starch and two additives: poly(vinyl alcohol) PVA and Plastronfoam PDE. Foams were processed with seven starch/additives combinations at two different extruder-cooker's screw rotational speeds. The densities of starch foams depended significantly on the additive type and content. The linear relationship between the Young modulus and the ultimate compression force and apparent density was found. The foams processed with the addition of PVA had low density, porosity and lower values of the Young modulus than the foams prepared with PDE.

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“…Amongst various natural feedstocks for biodegradable polymers, starch, the second most abundant renewable polysaccharide in nature (Guan and Hanna, 2006), has been recognized as one of the most promising substitutes for petrochemical plastics for a variety of applications , Carr et al, 2006. Composed of repeating D-glucopyranosyl units, starch can be separated into amylose which is linear linked by α (1-4) linkage, and amylopectin which has α (1-4)-linked backbone and α (1-6)-linked branches (Avella et al, 2005).…”

Section: Starch Based Polymersmentioning

confidence: 99%

Life Cycle Assessment (LCA) of Light-Weight Eco-composites

Guo¹

2012

Springer Theses

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LCA of Light-weight Eco-composites Statement of originality 2 Statement of originalityI hereby declare that this submission is my own work and to the best of my knowledge it contains no materials previously published or written by another person.Contributions made to the research of this thesis by others, with whom I have worked with are explicitly acknowledged. I also declare that the intellectual content of this thesis is the product of my own work, except to the extent that assistance from others with data collection and modification of process-oriented model DNDC is acknowledged. Miao GuoSep 2010 LCA of Light-weight Eco-compositesAbstract 3 AbstractThe environmental profiles of novel wheat based foam materials were investigated in this thesis using Life Cycle Assessment (LCA) methods. The LCAs were developed using primary data collected from industrial sources combined with new laboratory experiments supplemented with secondary data from publicly available sources.Laboratory research was conducted to obtain important missing data on WBFs for the LCA modelling, including physico-chemical parameters, biodegradability and energy recovery under anaerobic digestion conditions.Contribution analysis suggested that the emissions evolved from the wheat agroecosystem and PVOH production, together with the energy and infrastructure involved in WBF production were the major contributors to the environmental burdens of the WBF life cycle in most impact categories. The atmospheric emissions resulting from WBF degradation at the end-of-life also emerged as another important contributor to environmental impact. Amongst the diverse ‗end-of-life' scenarios examined, AD and home composting were suggested to be the optimum choices for WBF waste treatment. This research discusses two N 2 O modelling approaches and presents a method to expand the system boundary by integrating the process-oriented model DNDC for field emissions into the LCA. Sensitivity analysis suggests that the environmental profiles of agricultural products are influenced substantially by the system boundary definition. LCA of Light-weight Eco-compositesAbstract 4 Furthermore, it suggests that the ‗general rule' in LCA practice by applying an empirical model or a default emission factor (EF) could deliver unreliable LCA findings.This study also evaluated the sensitivity of the LCA results to methodology and data variations and quantified the uncertainties in the LCA outcomes arising from uncertainty in the inventory and data variability. This has led to an increase in confidence in the LCA findings. At the same time it indicates the areas where improvements in data or methods are needed in order for robust conclusions to be drawn and unbiased information to be delivered e.g. the methodological rigidity of characterization models, the IPCC Tier 1 EF uncertainty range. LCA of Light-weight Eco-compositesAcknowledgements 5

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Influence of Fibers on the Mechanical Properties of Cassava Starch Foams

Cited by 56 publications

References 15 publications

Biodegradable foams based on starch, polyvinyl alcohol, chitosan and sugarcane fibers obtained by extrusion

Biodegradable foams based on starch, polyvinyl alcohol, chitosan and sugarcane fibers obtained by extrusion

Effect of PVA and PDE on selected structural characteristics of extrusion-cooked starch foams

Life Cycle Assessment (LCA) of Light-Weight Eco-composites

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