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首页> 外文期刊>Journal of Applied Polymer Science >Lignin-Polyethylene Glycol Matrices and Ethylcellulose to Encapsulate Highly Soluble Herbicides
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Lignin-Polyethylene Glycol Matrices and Ethylcellulose to Encapsulate Highly Soluble Herbicides

机译：木质素-聚乙二醇基质和乙基纤维素用于包封高度可溶性的除草剂

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The blending of lignin with polyethylene glycol (PEG) allowed us to obtain formulations with controlled release properties in which metribuzin have been successfully trapped with encapsulation efficiency higher than 85%. Moreover, the modification of the lignin's viscoelastic properties by the addition of PEG led to obtain herbicide formulations with active ingredient contents lower than 15%, suitable for its application in soil. Fourier transformed infrared spectroscopy and differential scanning calorimetry studies indicated the compatibility between polymers and metribuzin in lignin-based controlled release formulations (CRFs). Lignin-based formulations were coated in a Wurster-type fluidized-bed equipment using ethylcellulose and dibutylsebacate. Scanning electron microscope pictures showed a homogeneous film in ethylcellulose-coated CRFs. The kinetic release studies showed that the release rate of metribuzin was mainly controlled either by selecting the granule size of controlled release lignin-PEG matrixes, or by changing the thickness of coating film for ethylcellulose coated CRFs. These results could help to increase the efficiency of delivery of the highly soluble herbicide metribuzin and prevent the environmental pollution derived from its use. (C) 2014 Wiley Periodicals, Inc.
机译：木质素与聚乙二醇（PEG）的共混使我们能够获得具有控释特性的制剂，其中已成功捕获了美特津，其包封率高于85％。此外，通过添加PEG来改变木质素的粘弹性质导致获得活性成分含量低于15％的除草剂制剂，适合于在土壤中的应用。傅里叶变换红外光谱和差示扫描量热法研究表明，基于木质素的控释制剂（CRFs）中聚合物和甲丁嗪之间具有相容性。基于木质素的制剂使用乙基纤维素和癸二酸二丁酯在Wurster型流化床设备中包衣。扫描电子显微镜照片显示在乙基纤维素涂覆的CRF中有均匀的薄膜。动力学释放研究表明，美法津的释放速率主要通过选择控制释放的木质素-PEG基质的颗粒大小或通过改变乙基纤维素包被的CRF的包衣厚度来控制。这些结果可以帮助提高高溶解性除草剂美三嗪的递送效率，并防止其使用引起的环境污染。 （C）2014威利期刊公司

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