Institut de Chimie de Clermont-Ferrand (ICCF), UMR 6296, Blaise Pascal University , 63177 Aubière, France.
J Agric Food Chem. 2016 Jul 20;64(28):5653-61. doi: 10.1021/acs.jafc.6b01786. Epub 2016 Jul 12.
A study was conducted on the biodegradation of aromatic-aliphatic copolyester-based agricultural film in soil at 25 °C. The polymer is known to be biodegradable under composting conditions although rather recalcitrant under mesophilic conditions. The material investigated comprised of the copolyester filled with approximately 25% of starch containing biodegradable plasticizers, and its behavior was compared to the corresponding material without the filler. Mineralization followed by CO2 production merely reached the point of about 6% after 100 days of incubation in the pure copolyester film, whereas the value of around 53% was recorded for the filled copolyester film, which exceeded the readily biodegradable starch filler content in the material by more than 20% and could be accounted for biodegradation of the copolyester. It was suggested that the accelerated copolyester biodegradation in the starch-filled material was most likely explained by the increase in the active surface area of the material available for the microbial attack after biodegradation of the filler. The results were supported by changes in molecular weight distributions of the copolyester and observations made by several microscopic techniques. These findings encourage further development of biodegradable agricultural films based on this material.
一项研究在 25°C 的土壤中对芳香族脂肪族共聚酯基农用薄膜的生物降解进行了研究。尽管该聚合物在中温条件下相当难生物降解，但已知在堆肥条件下是可生物降解的。所研究的材料由填充约 25%淀粉的共聚酯组成，其中含有可生物降解的增塑剂，并将其与不含填料的相应材料进行了比较。在纯共聚酯薄膜中培养 100 天后，矿化随后产生的 CO2 仅达到约 6%，而填充共聚酯薄膜的矿化率约为 53%，这超过了材料中可生物降解淀粉填料含量的 20%以上，可以归因于共聚酯的生物降解。研究人员提出，在填充淀粉的材料中，共聚酯的生物降解加速很可能是由于在填充剂生物降解后，微生物攻击的可用材料的有效表面积增加所致。这些结果得到了共聚酯分子量分布变化以及几种微观技术观察结果的支持。这些发现鼓励进一步开发基于这种材料的可生物降解农用薄膜。
