Weak-base anion exchange membranes by amination of chlorinated polypropylene with polyethyleneimine at low temperatures
Weak-base anion exchange membranes by amination of chlorinated polypropylene with polyethyleneimine at low temperatures
复制标题
DOI：
10.1016/j.memsci.2008.03.017
复制
发表时间：
2008-06
影响因子：
9.5
通讯作者：
Joo-Hee Hong;Dan Li;Huanting Wang
中科院分区：
文献类型：
--
作者：
Joo-Hee Hong;Dan Li;Huanting Wang
在低温（30-55°C）下，在丙酮和甲苯的溶剂混合物中，用聚乙烯亚胺（PEI）胺化商业氯化聚丙烯（CPP），产生胶态PEI胺化CPP悬浮液，从而产生阴离子交换膜。采用傅里叶红外光谱（FT-IR）、元素分析、扫描电镜（SEM）、热重分析（TG）等方法对CPP膜和PEI胺化CPP膜的化学结构、化学组成、微观结构和热稳定性进行了表征。还测定了PEI-胺化CPP膜的离子交换容量、水吸收、甲醇吸收和离子电导率。PEI-CPP膜的离子电导率为0.89×10− 2 ~ 1.36×10−2S/cm，阴离子交换容量为7.38 ~ 9.33mmol/g干膜，胺化度从50.2%提高到65.3%。随着胺化程度的增加，PEI-CPP膜的吸水率增加，而甲醇的吸水率下降。本文开发的PEI-CPP膜可用于一系列应用，并且可进一步转化为用于直接甲醇碱性燃料电池的季铵基膜。
Commercial chlorinated polypropylene (CPP) was aminated with polyethyleneimine (PEI) in a solvent mixture of acetone and toluene at low temperatures (30–55°C), yielding colloidal PEI-aminated CPP suspensions and thus anion exchange membranes. The chemical structure, chemical composition, microstructure, and thermal stability of CPP and PEI-aminated CPP membranes were characterized by Fourier infrared spectroscopy (FT-IR), elemental analysis, scanning electron microscopy (SEM), thermogravimetric analysis (TG), respectively. The ion exchange capacity, water uptake, methanol uptake, and ionic conductivity of PEI-aminated CPP membranes were also determined. The PEI-CPP membranes exhibited high ionic conductivities ranging from 0.89×10−2to 1.36×10−2S/cm, and anion exchange capacities ranging from 7.38 to 9.33mmol/g dry membrane while the degree of amination was raised from 50.2 to 65.3%. The water uptake of the PEI-CPP membrane increased whereas the methanol uptake dropped with the degree of amination increased. The PEI-CPP membranes developed here may be useful for a range of applications, and can be further converted into quaternary ammonium-based membranes for direct methanol alkaline fuel cells.