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Cationic CO2-based Waterborne Polyurethane with High Solid Content and Excellent Ageing Resistance

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Abstract

High solid content CO2-based cationic waterborne polyurethanes (CWPUs) were prepared using CO2-polyols as soft segment and N-methyl diethanolamine (MDEA) as hydrophilic group. The resulting stable aqueous dispersion displayed a high solid content of 52% with a low MDEA loading of 3.52 wt%. This novel structural CWPU can provide excellent adhesive strength, whose T-peel strength could reach 173.48 N/5cm, 20% higher than that of ester-based cationic waterborne polyurethane (87.55 N/5cm). The CO2-based CWPU film showed only 2 wt% swelling percentage after 240 min immersion in water, and no change was observed during its immersion in 5 wt% sodium hydroxide solution. The tensile strength of CO2-WPUs dropped slowly to 91.2% after 480 min immersion in a 5 wt% sodium hydroxide solution, whereas that of ester-based CWPUs dropped quickly to 32% after 240 min and their mechanical properties were lost after 360 min immersion. Meanwhile, the retention of the tensile strength of the CO2-CWPUs was 81.5% even after 720 min immersion in 10 wt% H2O2 solution, while it was only ca. 38% for the ester-based CWPUs. These results indicated that the cationic CO2-based CWPU may be promising waterborne adhesive with outstanding ageing resistance due to its synergistic effect from carbonate and ether groups of CO2-polyol structure.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (No. 32071686).

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Authors and Affiliations

  1. Northeast Forestry University, Key Laboratory of Bio-based Material Science and Technology (Ministry of Education), Harbin, 150040, China

    Hong-Ming Zhang, Guang-** Han & Wan-Li Cheng

  2. Key Laboratory of Polymer Ecomaterial, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China

    Hong-Ming Zhang, Shun-Jie Liu & **an-Hong Wang

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  1. Hong-Ming Zhang
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  2. Guang-** Han
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  3. Wan-Li Cheng
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  4. Shun-Jie Liu
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  5. **an-Hong Wang
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Correspondence to Wan-Li Cheng or **an-Hong Wang.

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Zhang, HM., Han, GP., Cheng, WL. et al. Cationic CO2-based Waterborne Polyurethane with High Solid Content and Excellent Ageing Resistance. Chin J Polym Sci 40, 1183–1192 (2022). https://doi.org/10.1007/s10118-022-2738-9

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  • DOI: https://doi.org/10.1007/s10118-022-2738-9

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