Green Conversion of Total Lignocellulosic Components of Sugarcane Bagasse to Thermoplastics Through Transesterification Using Ionic Liquid
Green Conversion of Total Lignocellulosic Components of Sugarcane Bagasse to Thermoplastics Through Transesterification Using Ionic Liquid
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DOI：
10.1021/acssuschemeng.1c05281
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发表时间：
2021-11-02
影响因子：
8.4
通讯作者：
Takahashi, Kenji
中科院分区：
文献类型：
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作者：
Suzuki, Shiori;Hamano, Yosuke;Takahashi, Kenji
考虑到最近的环境问题，最大限度地减少我们对化石燃料的依赖并最大限度地利用可持续和丰富的木质纤维素生物质至关重要。在此，我们提出了一种简便的绿色转化的甘蔗渣，富含木质纤维素的农业废物，通过利用其总的木质纤维素成分的价值的热塑性塑料。为了在不牺牲关键机械性能的情况下赋予甘蔗渣足够的热成型性，通过一锅法和两步反应用长链和短链酰基取代所有羟基（OH）基团，从而精确控制酰基摩尔比。具有己酰基和乙酰基（类似于20：80，mol/mol）的酯化甘蔗渣在180 ℃下表现出优异的熔体流动性，同时保持良好的机械性能（拉伸强度：35 +/-4MPa和杨氏模量：1.6 +/-0.1GPa），这归因于引入的长链酰基以及保留的半纤维素和木质素组分的增塑剂效应。另外，酯化甘蔗渣的材料性质是理想地可调的并且取决于酰基和木质纤维素的类型。因此，这些发现表明木质纤维素在各个领域中用作高附加值生物质塑料的潜力，为木质纤维素组分用作聚合物材料铺平了道路。
Considering the recent environmental problems, it is critical to minimize our dependence on fossil fuels and maximize the utilization of sustainable and abundant lignocellulosic biomass. Herein, we present a facile approach for the green conversion of sugarcane bagasse, a lignocellulose-rich agro waste, to valorized thermoplastics by utilizing its total lignocellulosic constituents. To impart adequate thermal moldability to the bagasse without sacrificing the key mechanical properties, all hydroxy (OH) groups were substituted with long- and short-chains acyl groups via one-pot and two-step reactions, allowing for a precise control of the acyl group molar ratio. The esterified bagasse with hexanoyl and acetyl groups (similar to 20:80, mol/mol) demonstrated an excellent melt-flowability at 180 degrees C, while maintaining good mechanical properties (tensile strength: 35 +/- 4 MPa and Young's modulus: 1.6 +/- 0.1 GPa), which were attributed to the plasticizer effects of the introduced long-chain acyl group as well as the retained hemicellulose and lignin components. Additionally, the material properties of the esterified bagasse were desirably tunable and dependent on the type of acyl groups and lignocellulose. Thus, these findings demonstrate the potential for lignocelluloses to be used as a high value-added biomass plastic in various fields, paving the way for the use of lignocellulosic components as polymeric materials.