Mechanical properties and enzymic degradation of thermoplastic and granular sago starch filled poly(ε-caprolactone)

Ishiaku, U. S.; Pang, K. W. Peter; Lee, W.S; Ishak, Z. A. Mohd

doi:10.1016/s0014-3057(01)00125-2

Cited by 132 publications

(59 citation statements)

References 10 publications

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“…In the past decades, many attempts have been focused on blending plastic materials with cheap and biodegradable natural biopolymers, such as starch, cellulose, and chitin, to create new materials with desired properties [1][2][3][4][5][6][7][8][9][10][11][12]. These biopolymers, especially starch, are abundant, inexpensive, renewable, and fully biodegradable.…”

Section: Introductionmentioning

confidence: 99%

Physical properties and biodegradability of maleated-polycaprolactone/starch composite

2003

Polymer Degradation and Stability

216

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Section: Introductionmentioning

confidence: 99%

Physical properties and biodegradability of maleated-polycaprolactone/starch composite

2003

Polymer Degradation and Stability

216

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“…It is clear that PCL had a smooth surface, while the irregular nature of the starch granules was observed in SPCL10 and SPCL12, indicating that starch granules have been completely restructured, which suggested that the starch/PCL displayed thermoplastic nature. Generally, without deformation, starch granules are homogeneously dispersed throughout the PCL/starch blends as droplet-like particles (Avella et al 2000;Ishiaku et al 2002;Matzinos et al 2002).…”

Section: Characterization By Ftir and Semmentioning

confidence: 99%

“…PCL degradation is initiated with chain scission, followed by reduction in molecular weight and the liberation of low molecular weight organic acid, e.g., adipic acid (Benedict et al 1983). When PCL immersed in enzyme lipase solution, the quantity of acid liberated was coincided with its biodegradability (Ishiaku et al 2002). Microorganisms including bacteria and fungi secrete enzymes to biodegrade PCL.…”

Section: Starch/pcl Blends Biodegradation and Denitrification Mechanismsmentioning

confidence: 99%

“…The enzymatic degradation process of starch/PCL blends was affected by different factors. Dry granular sago starch/ PCL blends undergo higher weight loss compared to their thermoplastic starch/PCL counterparts after 18-h exposure to the enzyme glucoamylase, and the weight loss increased with increase in sago starch concentration because the enzyme selectively hydrolyzes the starch so enzyme activity increased with increase in starch content (Ishiaku et al 2002). They believed that the tendency toward decreased hydrolysis of thermoplastic starch/PCL blends had been attributed to the de-structuring of the starch.…”

Section: Starch/pcl Blends Biodegradation and Denitrification Mechanismsmentioning

confidence: 99%

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Comparison of polycaprolactone and starch/polycaprolactone blends as carbon source for biological denitrification

Shen

Wang

et al. 2014

Int. J. Environ. Sci. Technol.

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The cross-linked starch/polycaprolactone (SPCL10) and starch/polycaprolactone (SPCL12) blends were prepared, characterized and used as carbon source and biofilm support for biological nitrate removal. The results showed that SPCL10 and SPCL12 had similar performance on water absorption (about 21 %) and leaching capacity. FTIR spectra confirmed the cross-linking reaction between starch and PCL. SEM displayed a thermoplastic nature of SPCL10 and SPCL12. These blends could serve as solid carbon source and biofilm support for biological denitrification, and the acclimation time of microbial biofilm on the surfaces of SPCL10, SPCL12 and PCL were about 2 days, 2 days and 16 days, respectively. The average denitrification rates were 0.0216, 0.0154 and 0.0071 mg NO 3 -N/(g h) for SPCL10, SPCL12 and PCL, respectively, and the effluent NO 2 -N concentration was below 1 mg/L at all cases. The phenomenon of ammonia formation was observed, but ammonia concentration was below 0.5 mg/L.

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“…Esse resultado pode ser associado à presença de microcavidades, as quais contribuem para o aumento da rugosidade na superfície do material e, assim, para a maior absorção de água. 26,27 Rouilly e colaboradores 28 observaram que a adição do látex de borracha natural e do látex modificado a dispersões de amido de arroz gelatinizado levou a filmes mais resistentes à água e com valores mais elevados de ângulo de contato.…”

Section: Medidas De âNgulo De Contatounclassified

Nanocompósitos ternários de amido termoplástico e poli(Butadieno maleatado)

Ó¹,

Andrade²

2012

Quím. Nova

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Recebido em 9/9/11; aceito em 18/1/12; publicado na web em 30/4/12 TERNARY NANOCOMPOSITES OF THERMOPLASTIC STARCH AND MALEATED POLYBUTADIENE. Liquid polybutadiene (PBLH) was modified with maleic anhydride (MA). The material (PBLHM) was characterized and used to prepare hybrid materials by blending with glycerol-plasticized cassava starch (TPS) and an organophilic clay at 5 wt% content. Processing was performed by extrusion under mild conditions and led to TPS/PBLHM/clay hybrids, at 95/5 to 85/15 TPS/PBLHM compositions, which were characterized by contact angle measurements, X-ray diffraction and mechanical analysis. The results revealed a reduction in the hydrophilicity and the reinforcement of the hybrid materials. Biodegradability tests showed that the addition of clay and of PBLHM led to materials with high biodegradability.Keywords: starch; hydroxyl-terminated polybutadiene; organoclay. INTRODUÇÃOOs materiais poliméricos têm substituído os materiais convencionais, como madeira, metal e vidro, devido às suas propriedades, como baixa densidade, dureza, resistência à corrosão e facilidade no processamento. Essas propriedades permitem a fabricação de produtos de baixo custo em várias cores, tamanhos e formas.1 No entanto, os baixos valores de permeabilidade ao vapor d'água e, sobretudo, ao fato de serem não biodegradáveis têm gerado sérios problemas ambientais.2,3 Na perspectiva de desenvolvimento sustentável ou de eco-design, vários polímeros biodegradáveis foram sintetizados. [4][5][6] No entanto, o alto custo de produção e a alta cristalinidade desses polímeros têm dificultado sua aplicação comercial.Há alguns anos, o amido tem merecido a atenção de pesquisadores e de empresas como matéria-prima para a obtenção de bioplásticos. 7Totalmente biodegradável, encontrado em abundância e a baixo custo praticamente em todos os países, o amido pode ser processado por métodos convencionais, como os demais polímeros. Entretanto, há algumas limitações, como as propriedades mecânicas e a baixa resistência à umidade, que desfavorecem o seu uso em alguns setores. Assim, a modificação química e o desenvolvimento de misturas e compósitos surgem como soluções para o desenvolvimento desses materiais.8 A modificação é geralmente conseguida por meio de reações de modificação química, como a eterificação, esterificação, reticulação e graftização ou por tratamento térmico.9 Tais modificações são capazes de alterar as propriedades físico-químicas dos amidos granulares, podendo aumentar ou diminuir o caráter hidrofílico e introduzir grupamentos ionizáveis a esses materiais. 10Os nanocompósitos poliméricos são sistemas bifásicos, que consistem de matriz polimérica reforçada com cargas de elevada área superficial. Muitos estudos têm sido realizados sobre a preparação e caracterização de nanocompósitos polímero sintético/argilas. 11,12Quando incorporadas ao polímero, o seu caráter de reforço deve-se às restrições da mobilidade das cadeias poliméricas em contato com suas partículas. Além do reforço, foram reportadas melhorias nas proprie...

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Mechanical properties and enzymic degradation of thermoplastic and granular sago starch filled poly(ε-caprolactone)

Cited by 132 publications

References 10 publications

Physical properties and biodegradability of maleated-polycaprolactone/starch composite

Physical properties and biodegradability of maleated-polycaprolactone/starch composite

Comparison of polycaprolactone and starch/polycaprolactone blends as carbon source for biological denitrification

Nanocompósitos ternários de amido termoplástico e poli(Butadieno maleatado)

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