Studies on structures and ultrahigh permeability of novel polyelectrolyte complex membranes.
Studies on structures and ultrahigh permeability of novel polyelectrolyte complex membranes.
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DOI：
10.1021/jp102707z
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发表时间：
2010-06
期刊：
影响因子：
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通讯作者：
Qiang Zhao;Quan‐Fu An;Zhiwei Sun;J. Qian;Kueir-Rarn Lee;Cong-jie Gao;J. Lai
中科院分区：
文献类型：
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作者：
Qiang Zhao;Quan‐Fu An;Zhiwei Sun;J. Qian;Kueir-Rarn Lee;Cong-jie Gao;J. Lai
本工作研究了新型聚乙烯复合膜（PECMs）的聚集结构和自由体积，并将两者与其对水的渗透性相关联。以两步法制备聚（2-甲基丙烯酰氧基乙基三甲基氯化铵）（PDMC）和羧甲基纤维素钠（CMCNa）之间的可溶液加工的佩奇，即，在HCl中沉淀并在NaOH中再分散。随后在溶液浇铸方法中制造PECM。通过红外光谱、元素分析、动电位、透射电子显微镜和动态光散射等手段对佩奇固体的化学结构和聚集态结构进行了表征。利用场发射扫描显微镜（FESEM）和原子力显微镜（AFM）对复合材料的表面和截面结构进行了表征。用正电子湮没寿命谱（帕尔斯）表征了PECMs的自由体积。PECMs的自由体积大于组分的自由体积，这归因于PECMs独特的聚集结构。此外，帕尔斯表明，长寿命组件（τ（4））存在与PECMs，表明有水通道在PECMs。由于这些通道，PECMs显示出高渗透性和选择性。
This work studies the aggregation structures and free volumes of novel polyelectrolyte complex membranes (PECMs) and correlates the two with their ultrahigh permeability to water. Solution-processable PECs between poly(2-methacryloyloxy ethyl trimethylammonium chloride) (PDMC) and sodium carboxymethyl cellulose (CMCNa) were prepared in a two-step method, i.e., precipitation in HCl and redispersion in NaOH. PECMs were subsequently made in a solution casting method. Chemical and aggregation structures of PECs solids were characterized by FT-IR, element analysis (EA), zeta potential, transmission electron microscopy (TEM), and dynamic light scattering (DLS). Surface and cross-section structures of PECMs were characterized by a field emission scanning microscopy (FESEM) and an atomic force microscopy (AFM). Free volume of PECMs was characterized by positron annihilation lifetime spectroscopy (PALS). The free volume of PECMs is larger than that of component polyelectrolyte and is ascribed to the unique aggregation structures of PECMs. Moreover, PALS shows that a long lifetime component (tau(4)) exists with PECMs, indicating that there are water channels in PECMs. Due to these channels, PECMs showed ultrahigh permeability and selectivity.