High-performance polylactic acid compressed strawboard using pre-treated and functionalised wheat straw
High-performance polylactic acid compressed strawboard using pre-treated and functionalised wheat straw
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DOI：
10.1016/j.indcrop.2022.114996
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发表时间：
2022-05-18
影响因子：
5.9
通讯作者：
Sikora, Pawel
中科院分区：
文献类型：
--
作者：
Chougan, Mehdi;Ghaffar, Seyed Hamidreza;Sikora, Pawel
为提高麦草碎料的质量，开发了一种环保的前处理与表面功能化相结合的方法，以用于开发高性能聚乳酸(PLA)压缩草板。采用环保的混合前处理方法(即先热水后蒸汽、H+S)以及凹凸棒石纳米粘土(AT)和石墨烯纳米片(G)的表面功能化处理工艺，以获得适当的麦草表面质量，同时增加其与聚乳酸基质的相容性。通过扫描电子显微镜、傅里叶变换红外光谱、X射线衍射仪、拉曼光谱和热重分析等表征手段，验证了麦草颗粒的前处理和表面功能化是成功的。通过对压缩秸秆的抗张强度和吸水性能的测试，研究了麦草的前处理和表面功能化处理对其吸水性能的影响。10H+S-AT和10H+S-G的最大抗拉强度分别为28和27兆帕，显著高于未经表面处理和表面功能化的样品(即10UN)的最大抗拉强度(即9.7兆帕)。浸泡24 h后，10UN-G的吸水率最低(1.6%)，分别比10UN和10H+S样品低11%和31%。扫描电子显微镜表明，这种效果归因于石墨烯表面官能化改善了麦秆和聚乳酸基质之间的界面结合。
An eco-friendly pre-treatment coupled with surface functionalisation were developed to enhance the quality of wheat straw particles to be used for development of high-performance polylactic acid (PLA) compressed strawboard. Eco-friendly hybrid pre-treatment (i.e., hot water followed by steam, H+S) and surface functionalisation processes employing attapulgite nanoclay (AT) and graphene nanoplatelets (G) were used to obtain an appropriate wheat straw surface quality while increasing its compatibility with the PLA matrix. The successful pre-treatment and surface functionalisation of wheat straw particles was verified through characterisation techniques, including SEM, FTIR, XRD, Raman spectroscopy, and TGA. Tensile strength and water absorption properties of compressed strawboards were examined to investigate the influence of pre-treatment and surface functionalisation of wheat straws. The maximum tensile strengths of 28 MPa and 27 MPa were recorded for 10 H+S-AT and 10 H+S-G samples, respectively, which are considerably higher than the value (i.e., 9.7 MPa) registered for the sample without pre-treatment and surface functionalisation (i.e., 10UN). The lowest water absorption after 24 h of immersion was registered for 10UN-G (i.e., 1.6%), which is 11% and 31% lower than the 10UN and 10 H+S samples, respectively. The effect is attributed to an improved interfacial bond between wheat straw and PLA matrix due to the graphene surface functionalisation, as evidenced by the SEM.