Polish Academy of Sciences, Centre of Polymer and Carbon Materials, 34, M. Curie-Skłodowska Street, 41-819 Zabrze, Poland.
Biomacromolecules. 2010 Apr 12;11(4):839-47. doi: 10.1021/bm901331t.
Degradation of poly[(1,4-butylene terephthalate)-co-(1,4-butylene adipate)] (Ecoflex, BTA) monofilaments (rods) in standardized sandy soil was investigated. Changes in the microstructure and chemical composition distribution of the degraded BTA samples were evaluated and changes in the pH and salinity of postdegradation soil, as well as the soil phytotoxicity impact of the degradation products, are reported. A macroscopic and microscopic evaluation of the surface of BTA rod samples after specified periods of incubation in standardized soil indicated erosion of the surface of BTA rods starting from the fourth month of their incubation, with almost total disintegration of the incubated BTA material observed after 22 months. However, the weight loss after this period of time was about 50% and only a minor change in the M(w) of the investigated BTA samples was observed, along with a slight increase in the dispersity (from an initial 2.75 up to 4.00 after 22 months of sample incubation). The multidetector SEC and ESI-MS analysis indicated retention of aromatic chain fragments in the low molar mass fraction of the incubated sample. Phytotoxicity studies revealed no visible damage, such as necrosis and chlorosis, or other inhibitory effects, in the following plants: radish, cres, and monocotyledonous oat, indicating that the degradation products of the investigated BTA copolyester are harmless to the tested plants.
研究了聚[(1,4-丁二醇对苯二甲酸酯)-共-(1,4-丁二醇己二酸酯)]（Ecoflex，BTA）单丝（棒）在标准化沙壤土中的降解情况。评估了降解 BTA 样品的微观结构和化学成分分布的变化，并报告了降解后土壤的 pH 值和盐度变化，以及降解产物对土壤植物毒性的影响。对 BTA 棒样品在标准化土壤中孵育指定时间后的表面进行宏观和微观评估表明，从孵育的第四个月开始，BTA 棒的表面开始侵蚀，在 22 个月后观察到几乎完全分解的孵育 BTA 材料。然而，在此期间的重量损失约为 50%，仅观察到所研究的 BTA 样品的 M(w)略有变化，同时分散度略有增加（从初始值 2.75 增加到 22 个月后 4.00）。多检测器 SEC 和 ESI-MS 分析表明，在孵育样品的低摩尔质量部分保留了芳族链片段。植物毒性研究表明，在以下植物中没有观察到明显的损伤，如坏死和黄化，或其他抑制作用：萝卜、芥菜和单子叶燕麦，表明所研究的 BTA 共聚酯的降解产物对测试植物无害。
