Zhang Xian, Huang Runzhou
Co-Innovation Center of Efficient Processing and Utilization of Forest Products, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China.
School of Renewable Natural Resources, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, USA.
Polymers (Basel). 2020 Oct 5;12(10):2283. doi: 10.3390/polym12102283.
Thermogravimetric analysis (TGA) was used for the observation of the pyrolysis kinetics characteristics of high density polyethylene (HDPE)-based composites enhanced by a variety of basalt fibers (BFs) and wood flour (WF). The improved Coats-Redfern (C-R), Flynn-Wall-Ozawa (F-W-O), Friedman, and Kissinger methods were utilized to ascertain the specific apparent activation energy () of each component and composite material. The results indicate that BFs do not decompose under 800 °C, while the pyrolysis of WF and waste HDPE showed two significant weight loss zones (250-380 °C and 430-530 °C), relative to cellulose/hemicellulose and HDPE thermal degradation, respectively. The average of WF/BF/HDPE composites over the entire pyrolysis process obtained by the modified C-R method fluctuated in a range of 145-204 kJ/mol and increased with the BF content, which was higher than that of WPC (115-171 kJ/mol). The value of computed by the F-W-O method was significantly lower than that computed with the improved C-R method, which could validate the reliability of two methods by comparing with the literature. The Friedman and Kissinger methods were not applicable to this composite material reinforced by mixed fillers, so the obtained values were quite different from the previous two methods. The changes in showed that the addition of BFs could improve the average and further enhance the thermal stability and flame resistance of the composites.
采用热重分析（TGA）来观察由各种玄武岩纤维（BFs）和木粉（WF）增强的高密度聚乙烯（HDPE）基复合材料的热解动力学特性。利用改进的Coats-Redfern（C-R）法、Flynn-Wall-Ozawa（F-W-O）法、Friedman法和Kissinger法来确定各组分和复合材料的比表观活化能（）。结果表明，BFs在800℃以下不会分解，而WF和废旧HDPE的热解分别相对于纤维素/半纤维素和HDPE热降解表现出两个显著的失重区（250-380℃和430-530℃）。通过改进的C-R法获得的WF/BF/HDPE复合材料在整个热解过程中的平均在145-204kJ/mol范围内波动，并随BF含量的增加而增加，高于木塑复合材料（WPC）的平均（115-171kJ/mol）。用F-W-O法计算得到的值明显低于用改进的C-R法计算得到的值，通过与文献比较可以验证这两种方法的可靠性。Friedman法和Kissinger法不适用于这种由混合填料增强的复合材料，因此得到的值与前两种方法有很大不同。的变化表明，BFs的加入可以提高平均，进一步增强复合材料的热稳定性和阻燃性。
