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    1. zhang, y., et al. (2019). effect of isocyanate types on cell structure and mechanical properties of flexible polyurethane foams. journal of cellular plastics, 55(4), 453¨C468.

    2. lee, s.h., & park, j.y. (2020). control of open-cell content in flexible polyurethane foam using modified mdi. polymer engineering & science, 60(7), 1678¨C1686.

    3. chen, x., li, m., & wang, q. (2021). optimization of foam microstructure via reaction kinetics regulation with different isocyanates. chinese journal of polymer science, 39(5), 567¨C576.

    4. huang, l., & zhao, h. (2022). study on the relationship between nco index and foam open-cell ratio. china plastics industry, 50(3), 45¨C50.

    5. ozawa, k., & takahashi, t. (2018). advanced mdi technologies for high-performance flexible foams. mitsui chemicals technical review, 45, 22¨C30.

    6. smith, r.j., & brown, a. (2017). foam morphology: from fundamentals to applications. springer publishing.

    7. european polyurethane association (epua), 2020 annual report. section on flexible foam innovations and raw material developments.


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