Compatibility mechanism and fracture behavior of recycling polyurethane foam as asphalt extender: a molecular scale interpretation

IF 3.9 3区 工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY
Jiao Lin, Junfu Liu, Lihao Song, Zepeng Fan, Dong Liang, Guoyang Lu, Dawei Wang
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Abstract

A substantial proportion of waste polyurethane (PU) contributes significantly to solid waste accumulation. Alcoholysis technology can degrade waste PU into polyols for recycling, and the by-product (BPF) can be used as asphalt extender to produce BPF-asphalt while maintaining good performance. Based on the previous research, this study focuses on the interaction between BPF and asphalt at a molecular scale. Two types of BPF (BPF-A and BPF-B) were selected, and the molecular models were established based on their chemical compositions analyzed by nuclear magnetic resonance, which revealed their primary constituents as propylene oxide (PO), ethylene oxide (EO), and diamino diphenylmethane (MDA). The interaction energy between each component of BPF with each component of asphalt is negative, with polyether (EO/PO) showing the strongest interaction due to hydrogen bonding, followed by aromatic amine through hydrogen bonds and π-π stacking, proving that there is good compatibility between BPF and asphalt molecules. In addition, the tensile model was established to simulate the cracking behavior at different loading rates and verify the results of tensile ductility tests. The results show that the rapid tensile of molecular chains at high loading rates inhibits viscous relaxation, thereby improving the instantaneous load capacity. The excessively low loading rates may lead to the loss of energy dissipation efficiency due to excessive relaxation of the molecular structure. BPF-A, which is richer in polar EO groups, forms stronger hydrogen bonds with asphalt, yielding higher peak traction under rapid loading. Conversely, BPF-B’s rigid PO-dominated structure enables superior energy absorption and peak traction at low loading rates due to delayed molecular relaxation.

再生聚氨酯泡沫沥青填充剂的相容性机制及断裂行为:分子尺度的解释
大量的废聚氨酯(PU)对固体废物的积累起着重要的作用。醇解技术可将废PU降解成多元醇回收利用,副产品BPF可作为沥青填充剂生产BPF-沥青,同时保持良好的性能。在前人研究的基础上,本研究主要从分子尺度上研究BPF与沥青的相互作用。选择两种类型的BPF (BPF- a和BPF- b),通过核磁共振分析其化学成分,建立分子模型,发现其主要成分为环氧丙烷(PO)、环氧乙烷(EO)和二氨基二苯基甲烷(MDA)。BPF各组分与沥青各组分之间的相互作用能均为负,聚醚(EO/PO)由于氢键作用表现出最强的相互作用,其次是芳香胺通过氢键和π-π堆积,证明BPF与沥青分子之间具有良好的相容性。建立了拉伸模型,模拟了不同加载速率下的开裂行为,验证了拉伸延性试验结果。结果表明,高加载速率下分子链的快速拉伸抑制了粘性松弛,从而提高了瞬时载荷能力。过低的加载速率可能会导致分子结构的过度松弛而导致耗散效率的损失。BPF-A富含极性EO基团,与沥青形成更强的氢键,在快速加载下产生更高的峰值牵引力。相反,由于延迟分子弛豫,BPF-B的刚性po主导结构在低加载速率下具有优越的能量吸收和峰值牵引力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Materials and Structures
Materials and Structures 工程技术-材料科学:综合
CiteScore
6.40
自引率
7.90%
发文量
222
审稿时长
5.9 months
期刊介绍: Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.
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