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首页> 外文期刊>Journal of Applied Polymer Science >Modifying biodegradable plastics with additives based on condensed tannin esters
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Modifying biodegradable plastics with additives based on condensed tannin esters

机译：使用基于缩合单宁酯的添加剂改性可生物降解的塑料

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Condensed tannins derived from Pinus radiata bark have been esterified and added to biodegradable plastics as extrusion compounded functional plastic additives. The presence of longer alkyl chain hexanoate esters promoted tannin miscibility in the commercial polyesters Bionolle and Biopol whereas short chain acetate esters tended to remain as discrete domains, acting as fillers in the processed plastics. In the aliphatic polyester Bionolle the presence of tannin esters at typical plastic additive loadings did not alter plastic mechanical properties whereas at 5% content in Biopol the tannin-additives reduced both flexural and tensile properties. Similarly tannin esters do not alter the melt or glass transition temperatures of the polyesters, but tannin hexanoate at 5% can influence the crystallization temperatures. Artificially aging plastics realized the functionality these plant extracts can impart to plastics in acting to reduce ultraviolet (UV)-induced plastic degradation. Results indicate the tannin-additives likely provide a stabilising role through inhibiting UV penetration into the plastic, with color analysis suggesting the tannin moiety itself was sacrificial and preferentially degrading. The imparted UV stability was linked to the dissolution of tannin esters in the plastic with longer chain esters providing greater protection against UV degradation. Tannin esters showed potential as functional additives for biodegradable polymers enhancing the UV stability of the plastic. (c) 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41626.
机译：来自辐射松树皮的缩合单宁已被酯化并作为挤出复合功能塑料添加剂添加到可生物降解的塑料中。较长烷基链己酸酯的存在促进了商业聚酯Bionolle和Biopol中单宁的混溶性，而短链乙酸酯则倾向于保留为离散域，在加工塑料中充当填充剂。在脂肪族聚酯Bionolle中，在典型的塑料添加剂加入量下单宁酸酯的存在不会改变塑料的机械性能，而在Biopol中含量为5％时，单宁添加剂会同时降低挠曲和拉伸性能。类似地，单宁酸酯不会改变聚酯的熔融或玻璃化转变温度，但是5％的单宁己酸酯会影响结晶温度。人工老化的塑料实现了这些植物提取物可以赋予塑料以减少紫外线（UV）诱导的塑料降解的功能。结果表明，单宁添加剂可能通过抑制紫外线渗透到塑料中而起到稳定作用，而颜色分析表明单宁部分本身是牺牲性的，并且优先降解。赋予的紫外线稳定性与单宁酯在塑料中的溶解有关，其中较长链的酯提供了更好的抗紫外线降解的保护。单宁酸酯显示出作为可生物降解的聚合物的功能性添加剂的潜力，可增强塑料的紫外线稳定性。 （c）2014 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，41626。

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