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Biooxazolidines-Enabled Improvement of Monocomponent Polyurethane Coatings
Macromolecular Materials and Engineering ( IF 4.2 ) Pub Date : 2021-11-07 , DOI: 10.1002/mame.202100667 Xinyan Song 1 , Yinlei Lin 2, 3 , Chenjing Zhu 1 , Jianhui Huang 2 , Xiaoxu Bai 2 , Haichen Zhang 2 , Huawen Hu 2, 3 , Guangji Li 1, 4
Macromolecular Materials and Engineering ( IF 4.2 ) Pub Date : 2021-11-07 , DOI: 10.1002/mame.202100667 Xinyan Song 1 , Yinlei Lin 2, 3 , Chenjing Zhu 1 , Jianhui Huang 2 , Xiaoxu Bai 2 , Haichen Zhang 2 , Huawen Hu 2, 3 , Guangji Li 1, 4
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Single-component moisture-cured polyurethane (SPU) possesses the merit of easy preparation and high curing efficiency but suffers from poor apparent properties, mechanical performance, and thermal stability. Herein, the authors employ isophorone diisocyanate (IPDI) and 2-isopropyl-3-hydroxyethyl-1, 3-oxazolidines (IHO) to synthesize oxazolidine (termed as IPDI-IHO) for the subsequent modification of SPU. The structure and composition of the synthesized SPU/IPDI-IHO composites are unraveled by 1H and 13C NMR and FTIR spectroscopies. Apart from the curing properties of SPU/IPDI-IHO, the apparent properties, mechanical performance, thermal stability, and self-healing ability are evaluated. SEM and AFM characterizations reveal that IPDI-IHO incorporation significantly decreased the number of bubbles and thus reduce the SPU-based sample surface roughness. The thermal stability of SPU is notably improved after IPDI-IHO modification. The tensile strength and elongation at break also increases from 830 to 3710 kPa and from 210% to 600%, respectively, due to IPDI-IHO inclusion, with the optimal mechanical properties achieved at the IPDI-IHO mass ratio of 8 wt%. Furthermore, the cracks intentionally cut for the SPU/IPDI-IHO sample can be self-healed at 60 °C. The ensemble of the performance enhancements suggests that the IPDI-IHO developed in this work opens up a new route to fabricate high-performance SPU and related polymeric materials.
中文翻译：
生物恶唑烷对单组分聚氨酯涂料的改进
单组份湿固化聚氨酯（SPU）具有制备容易、固化效率高的优点，但表观性能、机械性能和热稳定性较差。在此，作者使用异佛尔酮二异氰酸酯（IPDI）和2-异丙基-3-羟乙基-1, 3-恶唑烷（IHO）合成恶唑烷（称为IPDI-IHO），用于后续的SPU改性。合成的 SPU/IPDI-IHO 复合材料的结构和组成被1 H 和13解开C NMR和FTIR光谱。除了 SPU/IPDI-IHO 的固化性能外，还评估了表观性能、机械性能、热稳定性和自愈能力。SEM 和 AFM 表征表明，IPDI-IHO 的加入显着减少了气泡的数量，从而降低了基于 SPU 的样品表面粗糙度。在IPDI-IHO改性后，SPU的热稳定性显着提高。由于 IPDI-IHO 的加入，拉伸强度和断裂伸长率也分别从 830 kPa 增加到 3710 kPa 和从 210% 增加到 600%，在 IPDI-IHO 质量比为 8 wt% 时实现了最佳机械性能。此外，为 SPU/IPDI-IHO 样品故意切割的裂缝可以在 60°C 下自我修复。
更新日期：2021-11-07
中文翻译：
生物恶唑烷对单组分聚氨酯涂料的改进
单组份湿固化聚氨酯（SPU）具有制备容易、固化效率高的优点，但表观性能、机械性能和热稳定性较差。在此，作者使用异佛尔酮二异氰酸酯（IPDI）和2-异丙基-3-羟乙基-1, 3-恶唑烷（IHO）合成恶唑烷（称为IPDI-IHO），用于后续的SPU改性。合成的 SPU/IPDI-IHO 复合材料的结构和组成被1 H 和13解开C NMR和FTIR光谱。除了 SPU/IPDI-IHO 的固化性能外，还评估了表观性能、机械性能、热稳定性和自愈能力。SEM 和 AFM 表征表明，IPDI-IHO 的加入显着减少了气泡的数量，从而降低了基于 SPU 的样品表面粗糙度。在IPDI-IHO改性后，SPU的热稳定性显着提高。由于 IPDI-IHO 的加入，拉伸强度和断裂伸长率也分别从 830 kPa 增加到 3710 kPa 和从 210% 增加到 600%，在 IPDI-IHO 质量比为 8 wt% 时实现了最佳机械性能。此外，为 SPU/IPDI-IHO 样品故意切割的裂缝可以在 60°C 下自我修复。
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