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首页> 外文期刊>Journal of Applied Polymer Science >Mechanical Properties and Biodegradability of LDPE Blends with Fatty-Acid Esters of Amylose and Starch
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Mechanical Properties and Biodegradability of LDPE Blends with Fatty-Acid Esters of Amylose and Starch

机译：直链淀粉和淀粉脂肪酯的LDPE共混物的机械性能和生物降解性

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摘要

In the present article a series of low-density polyethylene (LDPE) blends with different amounts of fatty esters of amylose and starch, were prepared in a Haake-Buchler Reomixer. The tensile as well as the dynamic thermomechanical (DMTA) properties of the blends were measured. It was found that as the amount of the esters increases in the blends, the tensile strength and especially teh elongation at break decrease nonlinearly. Scanning electron microscopy (SEM) was used to assess the interfacial adhesion between LDPE and the corresponding esters. The incompatibility of hte blends was also verified with DMTA and differential scanning calorimetry (DSC). From the biodegradation studies of the blendsduring exposure in activated sludge, it was found that all esters are biodegradable, although to a much lesser degree compared to pure strach. The biodegradation rate of the composites is relatively small due to the low biodegradation rate of the pure esters.
机译：在本文中，在Haake-Buchler Reomixer中制备了一系列低密度聚乙烯（LDPE）共混物，其中掺入了不同数量的直链淀粉和淀粉脂肪酯。测量了共混物的拉伸性能和动态热机械性能（DMTA）。已经发现，随着共混物中酯含量的增加，抗张强度，尤其是断裂伸长率非线性地降低。使用扫描电子显微镜（SEM）评估LDPE与相应酯之间的界面粘合力。还用DMTA和差示扫描量热法（DSC）验证了高温共混物的不相容性。从混合物在活性污泥中暴露期间的生物降解研究，发现所有酯都是可生物降解的，尽管与纯Strach相比其降解程度要小得多。由于纯酯的生物降解率低，复合材料的生物降解率相对较小。

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