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Title: Treatment of a cellulose fiber surface with a suberin monomer-derived polymer
Page Range: p.75-90
Author(s): Dongfang Li; Iversen T; Ek M
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Journal: Polymers from Renewable Resources
Issue Year: prr
Volume: 6
Issue No: No.3
Abstract
The biorefinery concept requires the development of value-added products, such as materials from biomass, including bark. Suberin is the most abundant component in birch (Betula verrucosa) outer bark and acts as a barrier against the penetration of water and external attacks from microorganisms. The aliphatic domain of suberin is rich in hydroxy fatty acids, such as cis-9,10-epoxy-18hydroxyoctadecanoic acid. In this study, it was isolated from the outer bark of birch and polymerised to prepare polyepoxy acid (PEA), which was used to impregnate filter papers. After complete drying, PEA-loaded filter papers were placed under UV to crosslink the epoxides through cationic polymerisation with a diaryliodonium salt as the photo-initiator. The crosslinking was evaluated using Fourier transform infrared (FTIR) spectroscopy and differential scanning calorimetry (DSC). The materials obtained after UV curing showed substantially increased hydrophobicity, decreased moisture absorption, increased tensile strength, and increased ductility. Field-emission scanning electron microscopy (FE-SEM) showed that the crosslinked PEA covered the surface of the cellulose fibres and filled the interstitial spaces. 45 Refs.
Title: Influence of botanic origin on the morphology and size of starch nanoparticles from Andean native starch sources
Page Range: p.91-104
Author(s): Torres F G; Troncoso O P; Vega J; Wong M
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Journal: Polymers from Renewable Resources
Issue Year: prr
Volume: 6
Issue No: No.3
Abstract
For the first time we report the extraction of starch nanoparticles from six varieties of native Andean potatoes. The starch granule size, amylose content and nanoparticle size varied with each different starch source. The size of the nanoparticles obtained ranged 65-278nm. No direct correlation was found between granule size and nanoparticle size. We have found that starches with similar amylose content can render nanoparticles of different sizes when they are obtained from different varieties of potatoes. 3 Refs.
Title: Production and characterization of gelatin-starch polymer matrix reinforced with cellulose fibers
Page Range: p.105-118
Author(s): Rodriguez-Castellanos W; Rodrigue D; Martinez-Bustos F; Jimenez-Arevalo O; Stevanovic T
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Journal: Polymers from Renewable Resources
Issue Year: prr
Volume: 6
Issue No: No.3
Abstract
In order to produce gelatin-starch polymer matrix reinforced with cellulose using twin-screw extrusion and compression moulding, gelatin-potato starch and gelatin-corn starch formulations were plasticised with glycerol (25% w/w) and reinforced with cellulose (0.34% w/w and 0.68% w/w dry basis) to produce flat sheets. According to the analysis of variance performed, adding TEMPOcellulose in the formulations decreased tensile strain at yield, but increased Young’s modulus depending on the type of starch used in the formulation. Scanning electron microscopy and thermogravimetric analyses showed that the formation of a polymer matrix from gelatin/potato starch/TEMPO-cellulose and gelatin/corn starch/TEMPO-cellulose was successfully achieved. 46 Refs.
