Formation and characterization of polyamide membranes via interfacial polymerization

界面聚合 渗透 化学工程 材料科学 化学 聚合 聚酰胺 聚合物 高分子化学 下降(电信) 扫描电子显微镜 单体 有机化学 复合材料 工程类 电信 生物化学 计算机科学
作者
Guo-Yong Chai,William B. Krantz
出处
期刊:Journal of Membrane Science [Elsevier BV]
卷期号:93 (2): 175-192 被引量:235
标识
DOI:10.1016/0376-7388(94)80006-5
摘要

The formation of plyamide membranes via the interfacial polymerization (IP) of m-phenylenediamine (MPD) in water with trimesoyl chloride (TMC) in hexane or heptane is studied using two novel measurement techniques: light relfection and pendant-drop tensiometry. These techniques permit obtaining real-time data on effects of TMC and MPD concentration as well as reaction time on the IP membrane-formation process. The structure of the IP membranes is studied using scanning electron microscopy (SEM) and their performance is assessed via high pressure permeation measurements. These studies indicate that for very small TMC concentrations (<0.01 wt%) the IP process is diffusion controlled in the organic layer. for higher TMC concentrations appropriate to commercial practice, the IP process is MPD-diffusion controlled in the IP film layer. Although under typical IP reaction conditions (MPD ≈2 wt%, TMC ≈0.1 wt%), the IP reaction is nearly instantaneous, the growth of the IP film thickness becomes self-limiting on a longer time scale (<40 s) owing to the inability of the two reactants to interpenetrate after sufficient densification has occurred toward the organic side of the IP film. However, the IP film properties continue to change long after (300 s) the IP film growth becomes self-limiting presumably because of additional cross-linking. The light-reflection, pendant-drop tensiometry, SEM, and permeation measurements provide complementary supporting information on the IP membrane-formation process. In particular, these studies clearly indicate that the reactant concentrations and reaction time can be optimized to achieve improved rejection and permeation-flux properties. These studies also indicate that the light-reflection and pendant-drop-tensiometry measurement techniques provide very useful tools for studying the very rapid IP membrane-formation process.
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