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首页> 外文期刊>Journal of Polymers and the Environment >Assessing the Potential of Farm Dairy Effluent as a Filler in Novel PLA Biocomposites
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Assessing the Potential of Farm Dairy Effluent as a Filler in Novel PLA Biocomposites

机译：评估新型PLA生物复合材料中农用乳制品废水作为填充剂的潜力

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The migration from the concept of waste streams to untapped side streams has meant that by-products from industrial processes are being investigated as sustainable resources. As a side stream containing cellulosic fibre, the influence of integrating farm dairy effluent (FDE) in polylactic acid (PLA) was investigated and compared with wood sander dust (SD). The mechanical and thermal properties of injection moulded specimens were evaluated as a function of filler type. The investigation indicated that FDE had similar density to SD but a lower stiffness attributed to the presence of proteins and the lesser amount of cellulose. The Young's moduli of the FDE composites were higher than the neat PLA, however, the tensile strength generally decreased but remained comparable to those filled with SD. Thermo-mechanical analysis indicated an improvement in the storage modulus of all composites containing 40 wt% of either filler above the glass transition temperature of PLA. Tensile testing of specimens that were exposed to accelerated weathering indicated a faster decrease in properties for the FDE composites compared to those filled with SD. The FDE composites degraded at least twice as fast as neat PLA and SD composites, which was tentatively attributed to the acids (e.g. fatty and amino-acids) contained in FDE and not present in SD. These findings revealed that using extrusion and injection moulding processes, FDE has potential as a composite filler from an improved stiffness and UV accelerated degradation perspectives.
机译：从废物流概念到未开发的侧流的迁移意味着正在研究工业过程中的副产品作为可持续资源。作为含纤维素纤维的侧流，研究了将农用乳业废液（FDE）整合到聚乳酸（PLA）中的影响，并将其与木砂光粉尘（SD）进行了比较。评估注塑样品的机械性能和热性能与填料类型的关系。研究表明，FDE具有与SD相似的密度，但较低的硬度归因于蛋白质的存在和较少的纤维素。 FDE复合材料的杨氏模量高于纯PLA，但是，抗拉强度总体上有所下降，但仍与填充SD的那些相当。热力学分析表明，在PLA的玻璃化转变温度以上，所有包含40 wt％两种填料的复合材料的储能模量都有改善。对暴露于加速风化的样品进行拉伸测试表明，与填充SD的相比，FDE复合材料的性能下降得更快。 FDE复合材料的降解速度至少是纯PLA和SD复合材料的两倍，这暂时归因于FDE中包含的，但SD中不存在的酸（例如脂肪和氨基酸）。这些发现表明，从改善的刚度和紫外线加速降解的角度来看，使用挤出和注射成型工艺，FDE具有作为复合填料的潜力。

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