Green synthesis of novel biocomposites from treated cellulosic fibers and recycled bio-plastic polylactic acid
Green synthesis of novel biocomposites from treated cellulosic fibers and recycled bio-plastic polylactic acid
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DOI：
10.1016/j.jclepro.2017.06.235
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发表时间：
2017-10-15
影响因子：
11.1
通讯作者：
Abokitse, Kofi
中科院分区：
文献类型：
--
作者：
Laadila, Mohamed Amine;Hegde, Krishnamoorthy;Abokitse, Kofi
研究了以包装工业回收的聚乳酸（PLA）为原料制备的生物复合材料的力学性能，并对纸浆和造纸固体废弃物中的纤维素纤维进行了处理。采用微波和酶处理对亲水性纤维素纤维进行了提取和表面改性。与微波处理相比，酶处理专门用于激活羟基和改善基质与纤维之间的粘附，包括控制纤维素纤维的长度，尺寸减少约50%（初级和混合生物固体分别为142和127克）。微波处理的原生生物固体和混合生物固体的纤维素纤维分别为293和341克。与再生PLA（杨氏模量644.47 +/- 30.086 MPa，断点拉伸应变为6.01 +/- 0.83%，屈服拉伸应力为29.49 +/- 3.64 MPa）相比，添加2% （w/w）处理过的纤维素纤维（杨氏模量887.83 MPa，断点拉伸应变为7.22%，屈服拉伸应力为41.35 MPa）的生物复合材料的力学性能有所提高。扫描电镜显示纤维素纤维的尺寸减小。x射线衍射和傅里叶变换红外光谱证实了新型生物复合材料的强力学性能。(C) 2017 Elsevier Ltd.版权所有。
This study investigated mechanical properties of biocomposites developed from recycled polylactic acid (PLA) from packaging industry and treated cellulosic fibers from pulp and paper solid waste. Microwave and enzymatic treatments were used for extraction and surface modification of hydrophilic cellulosic fibers. Enzymatic treatment was specifically performed for activation of hydroxyl groups and improvement of adhesion between matrix and fibers including controlling the length of cellulosic fibers with size reduction of around 50% (142 and 127 gm for primary and mixed biosolids, respectively) as compared to microwave treatment. Microwave treatment produced cellulosic fibers of 293 and 341 gm, for primary and mixed biosolids, respectively. Mechanical properties of biocomposites with 2% (w/w) of treated cellulosic fibers (Young's Modulus 887.83 MPa with tensile strain at breakpoint of 7.22%, tensile stress at yield 41.35 MPa) was enhanced in comparison to the recycled PLA (Young's Modulus 644.47 +/- 30.086 MPa with tensile strain at breakpoint of 6.01 +/- 0.83%, tensile stress at yield of 29.49 +/- 3.64 MPa). Scanning electron microscopy revealed size reduction of cellulosic fibers. X-ray diffraction and Fourier transform infrared spectroscopy confirmed strong mechanical properties of novel biocomposites. (C) 2017 Elsevier Ltd. All rights reserved.