Starch-Based Biodegradable Materials Suitable for Thermoforming Packaging

Avérous, Luc; Fringant, C.; Moro, L.

doi:10.1002/1521-379x(200108)53:8<368::aid-star368>3.0.co;2-w

Cited by 130 publications

(58 citation statements)

References 11 publications

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“…Isto pode estar relacionado à degradação parcial das cadeias poliméricas ocasionadas durante o processo de extrusão [18] . Carvalho et al [19] verificaram por cromatografia de alta eficiência por exclusão de tamanho (HPSEC) que a degradação sofrida pela cadeia polimérica durante a extrusão é influenciada pela umidade, temperatura e presença de plastificante; o aumento no teor de plastificante e a diminuição da temperatura reduzem a degradação.…”

Section: Solubilidade Em áGuaunclassified

Efeito do Processamento e das Condições Ambientais nas Propriedades de Matérias Biodegradáveis de Amido de Aveia

Galdeano¹,

Wilhelm²,

Grossmann³

et al. 2014

Polímeros

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Resumo: A característica hidrofílica dos biomateriais a base de amido resulta em alta instabilidade diante de diferentes condições ambientais. O amido de aveia, por possuir um conteúdo maior de lipídios em relação a outros amidos, tornase uma fonte interessante, uma vez que a hidrofobicidade aumentada pode atuar reduzindo sua capacidade de sorção de umidade. O objetivo do trabalho foi investigar o comportamento de filmes e laminados de amido de aveia, produzidos por casting e extrusão, respectivamente, plastificados com glicerol, sorbitol e ureia e armazenados em diferentes condições de umidade relativa. Mesmo com a presença do lipídio nativo, os materiais ainda mostraram instabilidade diante do aumento da umidade relativa de armazenagem, sendo observado um decréscimo na força e um aumento na deformação nos testes de perfuração. Em geral os biomateriais plastificados com glicerol apresentaram maior capacidade de sorção de água. O sorbitol foi o plastificante mais efetivo, pois produziu materiais com propriedades mecânicas similares aos outros plastificantes mesmo sendo usado em menor concentração molar. O processo de extrusão resultou em materiais finais com estruturas mais abertas e fragmentadas. Palavras-chave: Aveia, amido, plastificante. Effect of Processing and Enviromental Conditions in the Properties of Oat Starch Biodegradable MaterialsAbstract: The hydrophilic character of starch-based biomaterials generates high instability under different environmental conditions. Oat starch shows an interesting alternative for starch films because it contains higher lipid content than other common starches. This increased hydrophobicity can act reducing the moisture sorption capacity. The objective of this study was to investigate the behavior of oat starch films and sheets produced by casting and extrusion, respectively, plasticized with glycerol, sorbitol and urea and stored at different relative humidity. Even with the presence of native lipid, the materials still showed instability upon increasing the relative humidity for storage. Under higher humidity, a decrease in strength and an increase in deformation in puncture tests were observed. Biomaterials plasticized with glycerol showed higher water sorption capacity. Sorbitol was the most effective plasticizer because it led to materials with similar mechanical properties to other plasticizers even at lower molar concentrations. The extrusion process resulted in final materials with more open, fragmented structures.

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Section: Solubilidade Em áGuaunclassified

Efeito do Processamento e das Condições Ambientais nas Propriedades de Matérias Biodegradáveis de Amido de Aveia

Galdeano¹,

Wilhelm²,

Grossmann³

et al. 2014

Polímeros

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“…The main disadvantages of TPS are its pronounced hydrophilic character and inadequate mechanical properties. The inferior properties of TPS can be improved by the incorporation of other materials (natural fibers, nanoclays, or other biodegradable polymers) [1,2,[4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Thermoplastic Starch/Wood Composites: Effect of Processing Technology, Interfacial Interactions and Particle Characteristics

Fekete

Kun

Móczó

2017

Period. Polytech. Chem. Eng.

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IntroductionRecently a growing interest has been shown in the application of biopolymers as packaging materials in order to reduce the environmental pollution caused by plastic waste and to achieve sustainable development. Starch is considered as one of the most promising biopolymers because it is readily available, cheap and biodegradable. Starch is a semicrystalline polymer and it represents the major form of stored carbohydrates in plants. Starch is a mixture of two substances composed of α-D glucopyranosyl repeating units, an essentially linear polysaccharide-amylose and a highly branched polysaccharideamylopectin. One of the major problems with granular starch is its limited processability, which can be improved by the use of plasticizers. Thermoplastic starch can be obtained by the destruction of the starch granules in the presence of plasticizers under specific conditions. Polyols such as glycerol, glycols as well as water are the most widely used plasticizers [1][2][3]. The main disadvantages of TPS are its pronounced hydrophilic character and inadequate mechanical properties. The inferior properties of TPS can be improved by the incorporation of other materials (natural fibers, nanoclays, or other biodegradable polymers) [1,2,[4][5][6][7][8][9][10][11].A considerable number of papers deal with the effect of natural fibers on the properties of thermoplastic starch. Most of them study the influence of fiber type and amount usually by determining properties at one or two fiber contents. All kinds of fibers have been used as filler in TPS including various forms of cellulose [6,[12][13][14][15][16][17][18][19][20][21][22][23][24], jute [18,[25][26][27], sisal [28][29][30][31][32][33], wheat straw [13], flax [23,34] hemp [13,28,35,36], cotton [13,37,38], flax [19,39], ramie [20,40].According to the existing literature a relatively small number of papers have been published which consider the practical relevance of TPS/wood composites [7,[41][42][43][44][45][46]. There are even fewer paper about systematic experiments carried out as a function of fiber content in a wide composition range [2,41,42], furthermore, it is very difficult to find publications on the effect of processing methods on the properties of TPS/wood composites. In our earlier work we investigated different TPS/wood composites prepared by injection molding [47].

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“…As the melting temperature of pure starch is substantially higher than its decomposition temperature there is a necessity to use plasticizers, for example water. Under the influence of temperature and shear forces, disruption of the natural crystalline structure of starch granules and polysaccharides form a continuous polymer phase is reported (Avérous et al, 2001;Nashed et al, 2003;Shogren et al, 1993;. TPS produced from starch plastified only with water becomes very brittle at room temperature.…”

Section: Thermoplastic Starchmentioning

confidence: 99%

“…To improve the mechanical properties of TPS based materials also other additives can be applied, like emulsifiers, cellulose, plant fibres, bark, kaolin, pectin and others (Avérous et al, 2001;Ge et al, 2000).…”

Section: Thermoplastic Starchmentioning

confidence: 99%

Starch Protective Loose-Fill Foams

Mitrus¹

2012

Thermoplastic Elastomers

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Starch-Based Biodegradable Materials Suitable for Thermoforming Packaging

Cited by 130 publications

References 11 publications

Efeito do Processamento e das Condições Ambientais nas Propriedades de Matérias Biodegradáveis de Amido de Aveia

Efeito do Processamento e das Condições Ambientais nas Propriedades de Matérias Biodegradáveis de Amido de Aveia

Thermoplastic Starch/Wood Composites: Effect of Processing Technology, Interfacial Interactions and Particle Characteristics

Starch Protective Loose-Fill Foams

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