Cover Picture: Macromol. Mater. Eng. 8/2005

Ray, Suprakas Sinha; Bousmina, Mosto; Okamoto, Kazuaki

doi:10.1002/mame.200590015

Cited by 106 publications

(153 citation statements)

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“…4,5 Cassava starch is composed mainly of two types of polysaccharides, amylose and amylopectin. 1,6 Even though amylose to amylopectin ratio might not be constant depending on the cassava species, it is usually around 1:4, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…1,8 On the other hand, amylopectin features not only the presence of 1-4 α linkages, but also 1-6 α linkages, yielding much larger and coiled structures (Figure 1b). 9 In order to transform cassava starch on a plastic material, it is necessary to disrupt its hierarchical coiled structure.…”

Section: Introductionmentioning

confidence: 99%

“…1,6 Even though amylose to amylopectin ratio might not be constant depending on the cassava species, it is usually around 1:4, respectively.…”

mentioning

confidence: 99%

“…650 of thermoplastic starch (TPS) to prevent recrystallization of amylopectin chains (a process called retrogradation). 1,11 However, TPS, the resulting material after processing starch with plasticizers using water/shear stress and temperature, shows considerably poorer mechanical properties in comparison to oil-based plastics. …”

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confidence: 99%

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Nanocomposites Based on Cassava Starch and Chitosan-Modified Clay: Physico‑Mechanical Properties and Biodegradability in Simulated Compost Soil

Perotti

Kijchavengkul

Auras

et al. 2016

J. Braz. Chem. Soc.

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Organic-inorganic nanocomposites based on cassava starch, glycerol and chitosan-modified Veegum ® HS clay mineral at two different low polymer-to-clay ratios (2.5 and 5.0 wt.%) were prepared by extrusion producing flexible, transparent and homogeneous plastics as potential candidates for agricultural purposes. X-ray diffraction and transmission electron microscopy images revealed the presence of both intercalated and exfoliated nanocomposites in all samples, in which exfoliation is the predominant type of microscopic structure. Statistically significant improvements of over 20% on the tensile strength and Young's modulus were observed for samples containing chitosan-modified clay in comparison to pristine thermoplastic starch. Chitosan deeply affects the conversion of polymer carbon to CO 2 through biodegradation. Mineralization values for the sample loaded with 5.0 wt.% of chitosan-modified clay in simulated compost soil showed a reduction of almost 40% in comparison to thermoplastic starch, benefiting applications where delay degradation is required.Keywords: organic-inorganic hybrids, nanocomposites, extrusion, cassava starch, Veegum clay IntroductionPolymers produced from biodegradable resources have been intensely investigated over the past decades in an effort to decrease human reliance on fossil-based materials, especially over growing concerns about improper discard of these materials. [1][2][3] In particular, naturally occurring polymers or commonly known as biopolymers, macromolecules with large abundance across the globe, seem potential candidates to replace partially or totally oil-based plastics in many applications. 1,3 Among them, biopolymers made from or blends with starch appear in a growing number of reported studies as a potential material with a broad array of applications. In fact, starch possesses several properties desired in modern materials, such as large availability from different sources obtained in all regions, low cost associated to both cultivation/harvesting and also processing to obtain the final product and full biodegradability under regular disposal conditions. 4,5 Cassava starch is composed mainly of two types of polysaccharides, amylose and amylopectin. 1,6 Even though amylose to amylopectin ratio might not be constant depending on the cassava species, it is usually around 1:4, respectively.7 While both polysaccharides are constituted by the same monomer unit called α-D-glucopyranose, amylose possesses almost exclusively 1-4 α linkages, originating short linear chains ( Figure 1a). 1,8 On the other hand, amylopectin features not only the presence of 1-4 α linkages, but also 1-6 α linkages, yielding much larger and coiled structures (Figure 1b). 9 In order to transform cassava starch on a plastic material, it is necessary to disrupt its hierarchical coiled structure. 10 Addition of plasticizers such as glycerol or urea, among others, is often needed during the production Nanocomposites Based on Cassava Starch and Chitosan-Modified Clay J. Braz. Chem. Soc. 650 of ther...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…1,6 Even though amylose to amylopectin ratio might not be constant depending on the cassava species, it is usually around 1:4, respectively.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

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Nanocomposites Based on Cassava Starch and Chitosan-Modified Clay: Physico‑Mechanical Properties and Biodegradability in Simulated Compost Soil

Perotti

Kijchavengkul

Auras

et al. 2016

J. Braz. Chem. Soc.

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“…Unsaturated polyester resins (UPR) are potentially variable industrial resins and are extensively used to produce fiber reinforced composites to replace traditional materials in many modern engineering applications, manufacturing marine crafts and automotive parts electrical equipments, etc., because of their good mechanical, thermal and electrical properties, outstanding adhesion to various substrates, and light weight behavior [16,17]. Unsaturated polyester resins (UPR) are industrially produced by the reaction of aliphatic diols and aromatic diacids with unsaturated aliphatic diacids diluted with coreactant diluents like styrene [18].…”

Section: Introductionmentioning

confidence: 99%

Surface free energy and dielectric properties of vinyltriethoxysilane functionalized SBA-15-reinforced unsaturated polyester nanocomposites

2015

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In this work, organic-inorganic hybrid nanocomposites based on vinylsilane-functionalized SBA-15 reinforced unsaturated polyester resin were developed and characterized. SBA-15 was synthesized and functionalized with vinyltriethoxysilane. The surface functionalized SBA-15 (VSBA-15) with varying weight percentages (1, 3, 5, and 7 wt%) was incorporated into the unsaturated polyester resin. The resulting VSBA-15-reinforced epoxy composites were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, differential scanning calorimetry, and thermogravemetric analysis and impedance analyzer. Among the composite samples with varying loadings, the dielectric behavior of 7 wt% VSBA-15 loaded composite sample possesses the lowest value of dielectric constant, that is, 2.4 at 1 MHz frequency when compared with that of other samples. Further, the thermal stability was also enhanced to an appreciable extent, when compared with that of the samples with lower V-SBA-15 loadings. POLYM. COMPOS., 37:3433-3441,

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Highly Extensible Bio‐Nanocomposite Films with Direction‐Dependent Properties

Gaharwar

Schexnailder

Kaul

et al. 2010

Adv Funct Materials

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The structure and mechanical properties of bio‐nanocomposite films made from poly(ethylene oxide) (PEO) that is physically cross‐linked with silicate nanoparticles, Laponite, are investigated. Direction‐dependent mechanical properties of the films are presented, and the effect of shear orientation during sample preparation on tensile strength and elongation is assessed. Repeated mechanical deformation results in highly extensible materials with preferred orientation and structuring at the nano‐ and micrometer scales. Additionally, in vitro biocompatibility data are reported, and NIH 3T3 fibroblasts are observed to readily adhere and proliferate on silicate cross‐linked PEO while maintaining high cell viability.

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Cover Picture: Macromol. Mater. Eng. 8/2005

Abstract: Cover:The picture on the cover shows the structure and dynamic mechanical properties of neat poly(butylene succinate-co-adipate) and its nanocomposites with organically modified montmorillonite. Further can be found in the article by S. Sinha Ray, M. Bousmina,* and K. Okamoto on page 759.

Cited by 106 publications

References 0 publications

Nanocomposites Based on Cassava Starch and Chitosan-Modified Clay: Physico‑Mechanical Properties and Biodegradability in Simulated Compost Soil

Nanocomposites Based on Cassava Starch and Chitosan-Modified Clay: Physico‑Mechanical Properties and Biodegradability in Simulated Compost Soil

Surface free energy and dielectric properties of vinyltriethoxysilane functionalized SBA-15-reinforced unsaturated polyester nanocomposites

Highly Extensible Bio‐Nanocomposite Films with Direction‐Dependent Properties

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