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Polymers
Volume 17
Issue 21
10.3390/polym17212814
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This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Article

Methyltrimethoxysilane Vapor Deposition Strategy for Preparing Superelastic and Hydrophobic Flexible Polyurethane Foams

by
Hongyu Feng
1,
Haijing Ma
1,
Tian Jing
2,
Bohan Zhai
1,
Yanyan Dong
3,
Shaohua Jiang
1,* and
Xiaoshuai Han
1,*
1
Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China
2
Zhejiang Kaifeng New Material Limited by Share Ltd., Quzhou 324404, China
3
Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
*
Authors to whom correspondence should be addressed.
Polymers 2025, 17(21), 2814; https://doi.org/10.3390/polym17212814
Submission received: 29 August 2025 / Revised: 22 September 2025 / Accepted: 21 October 2025 / Published: 22 October 2025
(This article belongs to the Special Issue Polyurethane Composites: Properties and Applications)
Versions Notes

Abstract

Flexible polyurethane foam (FPUF) is widely used in buffer protection, biomedical, and wearable fields due to its light weight, high resilience, and adjustable mechanical properties. However, the traditional water foaming system is often accompanied by bottleneck problems such as cyclic fatigue attenuation, insufficient thermal stability, and surface hydrophilicity while achieving low density. In this study, a dense Si-O-Si cross-linked layer was in situ constructed on the surface of the foam by systematically regulating the water content of the foaming agent (1.5~2.5 wt%) and coupling with methyltrimethoxysilane (MTMS) chemical vapor deposition. Experiments show that the foam foamed with 2 wt% water content still maintains 0.0466 MPa compressive strength and 0.0532 MPa compressive modulus (modulus loss is only 16.6%) after 500 cycles of compression at 90% strain after MTMS deposition. MTMS modification drives the surface wettability to change from hydrophilic (70.4°) to hydrophobic (128.7°), and significantly improves thermal stability (the carbon residue rate at 800 °C increased to 25.5%, an increase of 59.4%). This study not only improves the resilience, but also endows the FPUF surface with hydrophobicity and thermal protection ability, which provides the feasibility for its wide application.
Keywords: flexible polyurethane foam; trimethoxymethylsilane; CVD method; hydrophobic; resilience flexible polyurethane foam; trimethoxymethylsilane; CVD method; hydrophobic; resilience

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MDPI and ACS Style

Feng, H.; Ma, H.; Jing, T.; Zhai, B.; Dong, Y.; Jiang, S.; Han, X. Methyltrimethoxysilane Vapor Deposition Strategy for Preparing Superelastic and Hydrophobic Flexible Polyurethane Foams. Polymers 2025, 17, 2814. https://doi.org/10.3390/polym17212814

AMA Style

Feng H, Ma H, Jing T, Zhai B, Dong Y, Jiang S, Han X. Methyltrimethoxysilane Vapor Deposition Strategy for Preparing Superelastic and Hydrophobic Flexible Polyurethane Foams. Polymers. 2025; 17(21):2814. https://doi.org/10.3390/polym17212814

Chicago/Turabian Style

Feng, Hongyu, Haijing Ma, Tian Jing, Bohan Zhai, Yanyan Dong, Shaohua Jiang, and Xiaoshuai Han. 2025. "Methyltrimethoxysilane Vapor Deposition Strategy for Preparing Superelastic and Hydrophobic Flexible Polyurethane Foams" Polymers 17, no. 21: 2814. https://doi.org/10.3390/polym17212814

APA Style

Feng, H., Ma, H., Jing, T., Zhai, B., Dong, Y., Jiang, S., & Han, X. (2025). Methyltrimethoxysilane Vapor Deposition Strategy for Preparing Superelastic and Hydrophobic Flexible Polyurethane Foams. Polymers, 17(21), 2814. https://doi.org/10.3390/polym17212814

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