文献类型：期刊文献

英文题名：Thermoplastic polyurethane foam with superior expansion ratio and mechanical properties by cross-linking modification and supercritical fluid foaming

作者：Gao, Xiulu[1]; Liu, Kaiqi[1]; Zhao, Ling[1]; Chen, Yichong[1]; Hu, Dongdong[1]

机构：[1] State Key Laboratory of Chemical Engineering and Low-Carbon Technology, Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China

年份：2026

卷号：342

外文期刊名：Polymer

收录：EI(收录号：20254719551310)

语种：英文

外文关键词：Biomechanics - Chemical modification - Crosslinking - Dimensional stability - Effluent treatment - Energy dissipation - Ethylene - Expansion - Initiators (chemical) - Morphology - Rigid foamed plastics - Runway foaming - Viscoelasticity

摘要：The preparation of thermoplastic polyurethane (TPU) foam with ultra-high expansion ratio and excellent resilience is challenging, thereby limiting the application in cushioning materials and high-end shoe materials. In this study, chemically cross-linked TPU was prepared through chemical cross-linking reaction and chemical capacitation reaction using diisopropyl peroxide (DCP) as an initiator and ethylene-maleic anhydride copolymer (E-MAH) as a crosslinking agent. The cross-linking structure improved the melt viscoelasticity of TPU, induced strain hardening behavior, and enhanced the foamability of cross-linked TPU with an initial expansion ratio of 45.2 times. CO2/N2 foaming improved the dimensional stability of TPU foam with different stable expansion ratio of 7–17.7 times. The uniform cell morphology and ultra-high expansion ratio provided TPU foam with low energy dissipation (ΔU/U ≈ 4.4 %) and excellent rebound resilience (～74.6 %). The synergistic implementation of chemical cross-linking modification and CO2/N2 foaming provides a method for preparing high-performance TPU foam. ? 2025 Elsevier Ltd