Aging behavior of polyether polyurethane binder: Thermal-oxidative, photo-oxidative, hydrolytic aging, and microscale

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2024-11-14 DOI:10.1016/j.conbuildmat.2024.139077

Qian Zhang , Xiaoya Hu , Hui Ma , Wei Li , Xiuqin Jin

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引用次数: 0

Abstract

Polyurethane pavements exhibit excellent toughness and weather resistance; however, as a polymer binder, polyurethane (PU) is prone to aging under the influence of natural factors such as heat, oxygen, light, and water. To investigate the microscale aging behaviors during thermal-oxidative, photo-oxidative, and hydrolytic aging, two types of one-component polyether polyurethanes were selected. Based on infrared spectroscopy test, atomic force microscope test, tensile performance test, and dynamic mechanical analysis test, the changes in micro-composition and micro-structure were comprehensively analyzed, and these changes were correlated with the macroscopic mechanical properties. The results indicate that no new functional groups were formed in the two types of PU during the aging processes, although molecular chain breakage occurred. Among them, the effect of thermal-oxidative aging on CO was obvious, while hydrolytic aging had a significant influence on C-H bond. After aging, the degree of hydrogen bonding increased, and microphase separation became more pronounced, variations of separation degree depending on the type of aging. Point aggregation of hard segments presented after the thermal-oxidative aging, while large area block or strip aggregation of hard segments was discovered after photo-oxidative aging. However, hard segments displayed fine-strip-aggregation and uniform dispersion in soft segments after the hydrolytic aging. A multidimensional radar chart composed of seven micro-factors revealed that chemical crosslinking dominated the polyurethane crosslinking, while physical crosslinking through hydrogen bonding between hard and soft segments was significantly enhanced. However, the strength of chemical crosslinking varied due to the residual isocyanate content in the original two types of PU. Correspondence analysis showed that the decline in tensile performance and the changes in DMA performance exhibited a high degree of consistency with microscale aging behaviors, indicating that the seven microscale factors can serve as systematic assessment indicators for formulating PU materials with enhanced anti-aging performance for pavement applications.

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聚醚聚氨酯粘合剂的老化行为：热氧化、光氧化、水解老化和微观老化

聚氨酯路面具有出色的韧性和耐候性，但作为一种聚合物粘结剂，聚氨酯（PU）在热、氧、光和水等自然因素的影响下容易老化。为了研究热氧化、光氧化和水解老化过程中的微观老化行为，我们选择了两种单组分聚醚聚氨酯。基于红外光谱测试、原子力显微镜测试、拉伸性能测试和动态力学分析测试，全面分析了微观组成和微观结构的变化，并将这些变化与宏观力学性能相关联。结果表明，两种聚氨酯在老化过程中虽然发生了分子链断裂，但没有形成新的官能团。其中，热氧化老化对 CO 的影响明显，而水解老化对 C-H 键的影响较大。老化后，氢键程度增加，微相分离更加明显，分离程度的变化取决于老化类型。热氧化老化后出现了硬段的点状聚集，而光氧化老化后则发现了硬段的大面积块状或条状聚集。然而，在水解老化后，硬段在软段中呈现出细条状聚集和均匀分散。由七个微观因素组成的多维雷达图显示，聚氨酯交联以化学交联为主，而通过硬段和软段之间氢键的物理交联则明显增强。不过，化学交联的强度因原有两种聚氨酯中残留的异氰酸酯含量而异。对应分析表明，拉伸性能的下降和 DMA 性能的变化与微观老化行为具有高度的一致性，这表明这七个微观因素可作为系统评估指标，用于配制具有更强抗老化性能的路面用聚氨酯材料。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.