Sustainable utilization of waste printed circuit boards powders in HDPE-wood composites: Synergistic effects of multicomponents on structure and properties
Sustainable utilization of waste printed circuit boards powders in HDPE-wood composites: Synergistic effects of multicomponents on structure and properties
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DOI：
10.1016/j.jclepro.2017.07.011
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发表时间：
2017-10-15
影响因子：
11.1
通讯作者：
Jia, Demin
中科院分区：
文献类型：
--
作者：
Tian, Shenghui;He, Hui;Jia, Demin
废弃线路板粉末中含有大量有毒物质，堆积数百万吨，造成严重的环境污染。本工作探索了WPCBP作为增强体替代木粉用于高密度聚乙烯（HDPE）-木材复合材料的潜在用途。采用裂解气相色谱-质谱、傅立叶变换红外光谱、热重分析、扫描电镜和X射线荧光分析等手段对WPCBP的理化性能进行了分析，结果表明WPCBP中含有溴系阻燃剂和过渡金属元素。将WPCBP掺入HDPE-木材复合材料中，可提高复合材料的缺口冲击强度、吸水率和流变性能，但由于WPCBP中过渡金属的存在，使复合材料的氧化诱导时间（OIT）降低。当WPCBP和WF含量分别为20wt%和10wt%时，KH-550和PE-g-MAH的加入同时提高了复合材料的拉伸强度和缺口冲击强度，与未改性样品相比，拉伸强度和缺口冲击强度分别提高了64.4%和66.1%。与原始复合材料相比，所有含有改性剂的复合材料均表现出更高的储能模量和更高的填料与基体之间的界面粘附力。SEM研究表明，KH-550和PE-g-MAH的加入改善了填料与HDPE基体之间的界面结合。本研究的价值在于，通过PE-g-MAH和KH-550改性WPCBP的共混，HDPE复合材料的力学性能得到了明显的改善，这对于降低HDPE-木材复合材料的生产成本具有重要意义，同时也为WPCBP的再利用提供了一条新的途径。(C)2017爱思唯尔有限公司版权所有
Accumulation of millions of tons of waste printed circuit boards powders (WPCBP) ate causing serious environmental pollution as it contains lots of toxicant substances. This work had explored the potential use of WPCBP as a reinforcement to replace wood flour (WF) for engineering value added high-density polyethylene (HDPE)-wood composites. Pyrolysis gas chromatography-mass spectrometry, fourier transform infrared, thermos-gravimetric analysis, scanning electron microscopy (SEM) and X ray fluorescence were selected to analyze the physico-chemical properties of WPCBP, and the results showed that the WPCBP contained bromine flame retardants and transition metals. Incorporating WPCBP into HDPE-wood composites improved the notched impact strength, water absorption rates "and rheological properties, while it reduced the oxidation induction time (OIT) which was due to the transition metals in WPCBP. When the content of WPCBP and WF fixed at 20 wt % and 10 wt %, the addition of KH-550 and PE-g-MAH simultaneously improved the tensile strength and notched impact strength of the composites which were enhanced by 64.4% and 66.1% compared to those of unmodified samples. All composites containing modifiers showed higher storage modulus and higher interfacial adhesion between the filler and matrix with respect to the original composites. SEM studies revealed that the addition of KH-550 and PE-g-MAH improved the interfacial adhesion between fillers and HDPE matrix. The value of this work lies in the fact that apparent mechanical properties improvement of HDPE composites has been achieved by the incorporation of PE-g-MAH and KH-550 modified WPCBP, which might be fruitful for reducing the production cost of the HDPE-wood composites and brought forward a new way to reuse WPCBP for a sustainable world. (C) 2017 Elsevier Ltd. All rights reserved.