Mechanical Properties Study and Cushioning Packaging Application Design of STG/PU Composite Foam Materials

FU Qiujia; JI Guowei; LIANG Yikun; DENG Zhiji; DONG Yujie; WU Ju; SUN Hangqi; LIN Kaijun; PIAO Yanqing; ZHANG Qianli

doi:10.19554/j.cnki.1001-3563.2026.05.036

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Packaging Engineering ›› 2026, Vol. 47 ›› Issue (5) : 350-362. DOI: 10.19554/j.cnki.1001-3563.2026.05.036

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Mechanical Properties Study and Cushioning Packaging Application Design of STG/PU Composite Foam Materials

FU Qiujia^1,2, JI Guowei^1,2,*, LIANG Yikun^1,2, DENG Zhiji^1,2, DONG Yujie¹, WU Ju¹, SUN Hangqi¹, LIN Kaijun¹, PIAO Yanqing¹, ZHANG Qianli¹

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Abstract

The work aims to develop a high-performance cushioning packaging structure based on shear-thickening gel (STG) and polyurethane (PU) composite foam materials, to address the issues of weak energy absorption capacity and susceptibility to permanent deformation in traditional cushioning materials under high strain rate impacts. STG/PU composite foams with different STG contents (0%, 4%, 8%, 12%) were prepared, and their density, hardness, and static/dynamic compression properties were tested. The optimized samples were combined with traditional EPE foam to construct a multi-layer cushioning structure. The synergistic cushioning mechanism was verified through drop hammer and drop ball impact tests, and packaging reliability was evaluated through vibration and drop tests. The experiments demonstrated that the introduction of STG significantly optimized the static and dynamic compression properties of PU foam, with the 8% STG/PU sample exhibiting the best cushioning effect under different impact heights. The multi-layer structure enhanced the overall cushioning performance, confirming the material's applicability in transportation environments. The results verify that STG significantly improves the energy absorption efficiency and dynamic response capability of STG/PU composites, with the 8% addition ratio providing optimal cushioning performance. The multi-layer structure enhances packaging stability and reliability. This research provides a basis for the development of high-performance cushioning packaging materials and expands the application pathways for non-Newtonian fluid materials.

Key words

STG / cushioning packaging / multi-layered cushioning structure / electronic products

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FU Qiujia, JI Guowei, LIANG Yikun, DENG Zhiji, DONG Yujie, WU Ju, SUN Hangqi, LIN Kaijun, PIAO Yanqing, ZHANG Qianli. Mechanical Properties Study and Cushioning Packaging Application Design of STG/PU Composite Foam Materials[J]. Packaging Engineering. 2026, 47(5): 350-362 https://doi.org/10.19554/j.cnki.1001-3563.2026.05.036

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