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CO 2 -triggered hydrophobic/hydrophilic switchable waterborne polyurethane–acrylate with simultaneously improved water resistance and mechanical properties
Journal of Coatings Technology and Research ( IF 2.3 ) Pub Date : 2021-04-07 , DOI: 10.1007/s11998-021-00476-y
Liangfeng Xu , Zhaofei Wang , Gongwen Yang , Guobing Zhang , Haibing Wei , Huagao Fang , Yunsheng Ding

Traditional waterborne polyurethane (WPU) has poor water resistance because of the incorporation of permanent hydrophilic groups, such as carboxyl group or ammonium salt, into polymer chains. Therefore, developing WPU with excellent water resistance and mechanical properties is highly desirable for industrial applications. In this study, CO2-triggered hydrophobic/hydrophilic switchable waterborne polyurethane–acrylate (WPUA) containing methyl methacrylate (MMA) units were designed and synthesized. The molecular structure, hydrophobic/hydrophilic switchable behavior, water resistance, and mechanical properties were systematically investigated and characterized. The WPUA with 10 wt% MMA exhibited a low water uptake (2.15 wt%) and linear swelling ratio (0.17 L%), as well as a high tensile strength (16.7 MPa) and modulus (85.9 MPa), which were much higher than those of the pristine WPU. This study indicated that the CO2-triggered WPUA dispersed stably as latex particles in water and possessed excellent water resistance and mechanical properties after the film formation.



中文翻译:

CO 2引发的疏水/亲水可切换水性聚氨酯-丙烯酸酯,同时提高了耐水性和机械性能

传统的水性聚氨酯(WPU)由于将永久性亲水基团(例如羧基或铵盐)结合到聚合物链中而具有较差的耐水性。因此,非常需要开发具有优异的耐水性和机械性能的WPU,以用于工业应用。在这项研究中,CO 2设计并合成了含有甲基丙烯酸甲酯(MMA)单元的触发式疏水/亲水可切换水性聚氨酯-丙烯酸酯(WPUA)。系统地研究和表征了分子结构,疏水/亲水可切换行为,耐水性和机械性能。MMA含量为10 wt%的WPUA的吸水率低(2.15 wt%)和线性溶胀率(0.17 L%),以及高拉伸强度(16.7 MPa)和模量(85.9 MPa),远高于原始WPU的那些。该研究表明,CO 2引发的WPUA以乳胶颗粒的形式稳定地分散在水中,并且在成膜后具有优异的耐水性和机械性能。

更新日期:2021-04-08
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