The uniform dispersion of multi-wall carbon nanotubes (MWNTs) in waterborne polyurethane (WPU) matrix was achieved by in-situ polymerization and latex particles assisted dispersion, endowing the MWNT/WPU composite film with the enhanced tensile strength, elongation at break and thermal stability. Compared with pure WPU, the breaking strength, elongation at break and initial decomposition temperature of the MWNT/WPU composite were increased by 69.6%, 16.4% and 130 °C, respectively. The decomposition amount at 400 °C of MWNT/WPU composite is only about half that of pure WPU. The latex particles assisted dispersion also effectively improved the exposure rate of MWNTs, making it easier for MWNTs to contact the target gas molecules. Increased exposure rate and uniform dispersion of MWNTs, and rich functional groups of WPU improved the gas sensing performance, making the response of the flexible MWNT/WPU to O₃ be 4.1 times of the responses of pure MWNTs. The limit of detection for O₃ reached 38.4 ppb. The enhanced mechanical properties endowed the flexible MWNT/WPU composite with the high bending stability and long-term stability. After one month, the response of the MWNT/WPU was changed by 3% and the responses decreased by no more than 10% after bending 5000 times.

通过原位聚合和乳胶粒子辅助分散实现多壁碳纳米管（MWNTs）在水性聚氨酯（WPU）基体中的均匀分散，赋予MWNT/WPU复合膜增强的拉伸强度、断裂伸长率和热稳定性。稳定。与纯WPU相比，MWNT/WPU复合材料的断裂强度、断裂伸长率和初始分解温度分别提高了69.6%、16.4%和130°C。MWNT/WPU 复合材料在 400°C 的分解量仅为纯 WPU 的一半左右。乳胶粒子辅助分散也有效提高了MWNTs的暴露率，使MWNTs更容易接触目标气体分子。提高 MWNT 的暴露率和均匀分散，₃是纯 MWNT 响应的 4.1 倍。O ₃的检测限达到38.4 ppb。增强的机械性能赋予柔性 MWNT/WPU 复合材料高弯曲稳定性和长期稳定性。1个月后，MWNT/WPU的响应变化3%，弯曲5000次后响应下降不超过10%。