Fire-resistant composites based on acrylic-functionalized lignin and polyester resin obtained from waste poly(ethylene terephthalate)

Scientific Technical Review Pub Date : 2022-01-01 DOI:10.5937/str2202032k

N. Knežević, Aleksandar Jovanović, J. Bošnjaković, Milena Milošević, M. Rančić, A. Marinković, Jelena D. Gržetić, Houda Gamoudi

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Abstract

This paper investigates the using potential of acryl-functionalized kraft lignin (AKL) in reducing the flammability of polymer composites based on recycled unsaturated polyester resins (UPR). Acryl functionalization of kraft lignin was performed by direct esterification of free polyphenolic groups with acryloyl chloride, after what, the AKL was blended in UPR resin synthesized from the polyols obtained by catalytic depolymerization of waste poly(ethylene terephthalate). The AKL was homogenized in UPR resin in different weight ratios: 2.5, 5.0, 7.5, and 12.5 wt.%. Structural and dynamic-mechanical characteristics of acryl-functionalized kraft lignin and composites were determined using FTIR spectroscopy, dynamicmechanical analysis (DMA), and tensile tests. The influence of functionalization and mass fraction of AKL on tensile and thermal properties of UPR resin was studied. The thermal properties of the composite were tested according to the standard UL-94 method, based on which the highest category of heat-resistant materials is a composite with 12.5 wt.% acylfunctionalized lignin.

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废聚对苯二甲酸乙酯中丙烯酸功能化木质素与聚酯树脂的耐火复合材料

研究了丙烯功能化硫酸盐木质素(AKL)在降低再生不饱和聚酯树脂(UPR)基聚合物复合材料的可燃性方面的应用潜力。将游离多酚基与丙烯酰氯直接酯化，再将木质素与废聚对苯二甲酸乙酯催化解聚得到的多元醇合成的UPR树脂共混，实现木质素的丙烯基功能化。AKL在UPR树脂中以不同的重量比(2.5、5.0、7.5和12.5 wt.%)均质。采用FTIR光谱、动态力学分析(DMA)和拉伸试验对丙烯酸基木质素及其复合材料的结构和动态力学特性进行了研究。研究了AKL的功能化和质量分数对UPR树脂拉伸性能和热性能的影响。根据标准UL-94方法测试了复合材料的热性能，在此基础上，最高类别的耐热材料是含有12.wt .%酰基功能化木质素的复合材料。

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Scientific Technical Review

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6 weeks