水老化作用下叠层聚氨酯支座的微相分离机理与力学性能退化研究

doi:10.11896/cldb.25010201

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Abstract In order to investigate the effect of water aging on the performance of polyurethane seismic isolation bearings, this study systematically investigated the water-aging effects on polyurethane elastomers (PUE) and laminated polyurethane elastomeric bearings(LPEB) through simulative experiments. The results revealed that water molecules permeated the PUE matrix, triggering the collapse of amorphous hard-segment microdomains and inducing a plasticization effect. This microstructural degradation led to a 52% reduction in tensile strength and a 3.4% decline in hardness, while the elongation at break increased due to enhanced segmental mobility. The mechanical properties stabilized as the water concentration gradient between the material’s interior and exterior equilibrated. For LPEB, water infiltration significantly compromised stiffness, with vertical stiffness and horizontal equivalent stiffness dropping to 10.3% and 21.2% of their initial values, respectively. Similar stabilization trends were observed in LPEB mechanical performance once dynamic water equilibrium was achieved. These findings highlight the critical role of water-induced microphase separation in governing the long-term durability of polyurethane-based seismic isolation systems, and provide a quantitative reference for the durability design of bridge seismic isolation bearings in hot and humid regions.

Key words： bridge engineering laminated polyurethane bearing water aging microphase separation mechanism mechanical property

Published: 25 January 2026 Online: 2026-01-27

CLC number:

TU533

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	YU Xiaotao
	YUAN Yong
	WANG Siqi

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YU Xiaotao,YUAN Yong,WANG Siqi. Study on the Microphase Separation Mechanism and Mechanical Property Degradation of Laminated Polyurethane Bearings Subjected to Water Aging[J]. Materials Reports, 2026, 40(2): 25010201-8.

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https://www.mater-rep.com/EN/10.11896/cldb.25010201 OR https://www.mater-rep.com/EN/Y2026/V40/I2/25010201

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