一种水溶性聚合物与K_6[α-P_2W_(18)O_(62)]·14H_2O的组装化学

Assembly of a water soluble polymer with K_6[α-P_2W_(18)O_(62)]·14H_2O

研究了一种水溶性聚合物poly(2-hydroxyl-3-(2-hydroxyethylamino)propyl methacrylate)(PGEA)与一种经典的Dawson类多酸化合物K6[α-P2W18O62]·14H2O(P2W18)在pH4.6的醋酸-醋酸钠(HAc/NaAc)缓冲溶液中的组装化学.通过Zeta电位仪、激光粒度散射、扫描电子显微镜(SEM)和高分辨透射电子显微镜(HRTEM)等表征手段研究了PGEA/P2W18杂化体系的组装过程,以及PGEA/P2W18体系在不同单位电荷浓度比的电势情况.此外,探讨了在溶液中表面净电荷接近零时PGEA与P2W18的组装过程中粒度大小的变化、平均粒径分布及其杂化体系的表面形貌特征.结果表明,由于静电相互作用力的存在,PGEA和P2W18在10min后形成了超分子结构.随着反应时间的延长,PGEA/P2W18杂化组装的粒径主要分布在120～300nm范围内,并在40min后组装趋于稳定,形成了规整均一的具有类葡萄串状形貌的特征.深入理解两者之间的组装化学为下一步开展PGEA/P2W18杂化体系的跨膜研究打下了良好的基础.

This paper reported the assembly of a water-soluble polymer, poly（2-hydroxyl-3-（2-hydroxyethylamino）propyl methacrylate） （PGEA）, and a classical Dawson cluster, K6[α-P2W18062] ·14H2O （P2W18）. The PGEA/P2W18 hybrid assembly was studied in HAc/NaAc buffer solution at pH 4.6 by utilizing dynamic light scattering, Zeta potential measurement, scanning electron microscopy, and high-resolution transmission electron microscopy, and both PGEA and P2W18 were stable under the experimental conditions. Zeta potential measurements were monitored at different PGEA/P2W18 charge ratios, and the results indicated that the net surface charge was close to zero at PGEA/P2W18=1.2： 1. The average size distribution and the surface morphology were then investigated at this charge ratio. It was found that a supramolecular structure was formed in HAc/NaAc buffer solution after mixing PGEA and P2W18 for only 10 min. The size distribution of the PGEA/P2W18 hybrid ranged from 120-300 nm and it reached equilibrium after 40 min. The morphology of the resulting hybrid material was uniform. The better understanding of the assembly process of PGEA/P2W18 hybrid set a solid foundation for future study of the membrane transportation of this hybrid material.