Zouari Mariem, Devallance David B, Marrot Laetitia
Innorenew CoE, Livade 6, 6310 Izola, Slovenia.
Faculty of Mathematics Natural Sciences and Information Technologies, University of Primorska, Muzejski Trg 2, 6000 Koper, Slovenia.
Materials (Basel). 2022 Mar 19;15(6):2271. doi: 10.3390/ma15062271.
The present study investigated the effect of biochar (BC) addition on mechanical, thermal, and water resistance properties of PLA and hemp-PLA-based composites. BC was combined with variable concentration to PLA (5 wt%, 10 wt%, and 20 wt%) and hemp (30 wt%)-PLA (5 wt% and 10 wt%); then, composites were blended and injection molded. Samples were characterized by color measurements, tensile tests, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and water contact angle analysis. Experimental results showed that adding 5 wt% of BC enhanced the composite's tensile modulus of elasticity and strength. Hence, the use of optimized loading of BC improved the mechanical strength of the composites. However, after BC addition, thermal stability slightly decreased compared with that of neat PLA due to the catalytic effect of BC particles. Moreover, the water-repelling ability decreased as BC content increased due to the specific hydrophilic characteristics of the BC used and its great porosity.
本研究调查了添加生物炭（BC）对聚乳酸（PLA）基复合材料以及麻-PLA基复合材料的机械性能、热性能和耐水性的影响。将不同浓度的BC与PLA（5重量%、10重量%和20重量%）以及麻（30重量%）-PLA（5重量%和10重量%）进行混合；然后，将复合材料进行共混并注塑成型。通过颜色测量、拉伸试验、热重分析（TGA）、差示扫描量热法（DSC）和水接触角分析对样品进行表征。实验结果表明，添加5重量%的BC可提高复合材料的拉伸弹性模量和强度。因此，使用优化含量的BC可提高复合材料的机械强度。然而，添加BC后，由于BC颗粒的催化作用，与纯PLA相比，热稳定性略有下降。此外，由于所用BC的特定亲水性及其高孔隙率，随着BC含量的增加，复合材料的拒水能力下降。
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