2011
DOI: 10.1590/s0104-14282011005000067
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Blendas compatíveis de amido termoplástico e polietileno de baixa densidade compatibilizadas com ácido cítrico

Abstract: Resumo: Blendas de polietileno de baixa densidade (PEBD) e amido termoplástico (TPS) modificado foram preparadas via extrusão reativa (REX) e caracterizadas por microscopia eletrônica de varredura (MEV), espectroscopia na região do infravermelho com transformada de Fourier (FTIR), absorção de umidade em ambiente com 53% de umidade relativa e difração de raios-X. Em uma primeira etapa, foi preparado o TPS-modificado, via REX a partir de uma mistura de amido de milho, ácido cítrico e glicerol. As blendas TPS-PEB… Show more

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Cited by 25 publications
(21 citation statements)
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“…With the addition of TA (sample S5), the disruption of starch granules is facilitated, and the compatibility between the polymer phases is improved, which has resulted in films with a continuous and more homogeneous matrix. Similar results were obtained by Miranda and Carvalho [26] , who compatibilised blends that contained thermoplastic starch and low-density polyethylene using citric acid, and by Olivato et al [27] , who included citric acid in blends of starch/PBAT.…”
Section: Analysis Of the Results And The Simultaneous Optimisationsupporting
confidence: 81%
“…With the addition of TA (sample S5), the disruption of starch granules is facilitated, and the compatibility between the polymer phases is improved, which has resulted in films with a continuous and more homogeneous matrix. Similar results were obtained by Miranda and Carvalho [26] , who compatibilised blends that contained thermoplastic starch and low-density polyethylene using citric acid, and by Olivato et al [27] , who included citric acid in blends of starch/PBAT.…”
Section: Analysis Of the Results And The Simultaneous Optimisationsupporting
confidence: 81%
“…O aumento discreto de intensidade da banda a 1205 cm , 2924 cm -1 e na região entre 3200 e 3500 cm -1 [29] . Estas bandas indicam que não ocorreram alterações nas amostras de amido modificado, em virtude da baixa concentração de AC adicionado às pré-misturas.…”
Section: Espectroscopia De Absorção No Infravermelho (Ftir)unclassified
“…Isto sugere que, além de provocar a cisão molecular do amido, o plastificante também foi capaz de esterificá-lo (evidenciado pela banda em ~1730-1735 cm -1 ). Esta reação de esterificação é tipicamente observada para temperaturas acima de 170/180 °C, o que permite concluir que o calor gerado pelas forças de cisalhamento atingiu temperaturas bem superiores a 130 °C durante o processamento [29] .…”
Section: Espectroscopia De Absorção No Infravermelho (Ftir)unclassified
“…Reactive extrusion has been successfully applied to TPS polymers 1 and has resulted in more flexible and less brittle TPS materials 5,[26][27][28][29] when compared to similar TPS materials obtained by conventional extrusion. However, few studies have investigated reative extrusion under edible acids and fewer have examined the use of reactive extrusion on cationic starch bio-based polymers 15 and even less have studied high methoxyl pectin polymers or pectin-starch composites and neither are information about such polymers mechanical or barrier performance.…”
Section: Introductionmentioning
confidence: 99%
“…Cationic and in natura starches were added to pectin in order to evaluate both starches polymers water susceptibility and mechanical properties, when blended by reactive extrusion with pectin in presence of citric acid. Besides of the edible and nontoxic characteristics of citric acid, its utilization is justified also due to pectin ability in forming gel at low pH (normally using citric acid), in presence of high temperature [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] . …”
mentioning
confidence: 99%