Esterification of Condensed Tannins and Their Impact on the Properties of Poly(Lactic Acid)

Published on Apr 19, 2013in Polymers4.329
· DOI :10.3390/POLYM5020344
Warren J. Grigsby19
Estimated H-index: 19
 , James H. Bridson8
Estimated H-index: 8
 + 1 AuthorsJaime-Anne Elliot1
Estimated H-index: 1
Sources
Abstract
Reported is a study evaluating the potential of esterified tannins as plastic additives in poly(lactic acid) (PLA). Tannin esterification using anhydrides was investigated as a route to synthesize tannin esters possessing varying ester chain length and degree of substitution (DS). Esterification decreased the tannin UV absorbance, predominately in the UVB region. However, tannin materials with longer ester chain lengths exhibited melt behaviors suitable for processing in plastics. On compounding into PLA, tannin hexanoate esters lowered the PLA glass transition by 5–6 °C. Shorter chain length tannin esters had a reduced effect on PLA polymer properties. The PLA flexural properties were significantly altered with stiffness decreases of up to 15% depending on ester chain length and loading. Artificial weathering of modified the PLA samples suggests the presence of tannin esters may confer a protection role to PLA on extended exposure. Overall, results suggest scope for the use of tannin esters possessing longer ester chain length as plastic additives.
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It is evident that in the future, the synthesis of polymeric materials will be limited to renewable sources, and incorporation of fossil-based raw materials will be restricted to those from recycled materials. Therefore, there has been an increase in academic and industrial research focused on obtaining different types of high-quality polymers using environmentally friendly alternatives. Tannins are a natural source of polyphenols that are widely distributed in nature. Due to their structural ch...
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Abstract A wholly bio-composite based on poly (lactic acid) (PLA) and tannin acetate was successfully prepared via in situ reactive extrusion using dicumyl peroxide (DCP) to improve interfacial adhesion. The composites based on PLA and tannin acetate with high acetylation degree exhibited increased molecular weight as compared with reactive extruded PLA, together with the improvement of Young’s modulus and tensile strength. The rheology results showed that reactive extruded PLA/tannin acetate co...
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Quantitative characterization of the solubility parameters and surface properties of larch bark proanthocyanidins will lay the foundation for quantitative studies of the interfacial interactions of proanthocyanidin/polymer composites and will improve the compatibility of components, with important practical and scientific significance. Here, the solubility parameters of highly polymerized larch polymeric proanthocyanidins (LPPCs) and less highly polymerized larch oligomeric proanthocyanidins (LO...
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Tannic acid (TA) is a bio-based high-molecular-weight organic molecule. Although biologically sourced, TA is a pollutant in industrial wastewater streams, and there is desire to find applications i...
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Abstract In this study a multi-analytical approach has been performed to characterise the constitutive materials of an ancient painted barkcloth or Tapa. Originating from Wallis Island, Polynesia, this cloth likely served utilitarian or ceremonial purposes and is part of the Felice Junck collection at the Pigorini, Muciv museum of Rome. During a recent conservation project, some micro-samples were taken from the support, brown and black painted areas and were investigated using the complementari...
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