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首页> 外文期刊>International journal of nuclear desalination >Chlorine Stability Of Fully Aromatic And Mixed Aromatic-aliphatic Polyamide Thin Film Composite Membranes
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Chlorine Stability Of Fully Aromatic And Mixed Aromatic-aliphatic Polyamide Thin Film Composite Membranes

机译：完全芳族和混合芳族脂族聚酰胺薄膜复合膜的氯稳定性

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Composite membranes containing a poly(m-phenylenediamine -trimesoamide) - poly(MPD-TMC), a fully aromatic polyamide - or poly-(1,3 -cyclohexanebis-methylamine-trimesoamide) - poly(CHMA-TMC), a mixed aromatic-aliphatic polyamide - barrier layer were prepared and were exposed to different concentrations of NaOCl solution containing 2000 ppm NaCl. An increase in water flux from 78 to 103 litres/m~2 h and a decrease in salt rejection from 94% to 91.3% were observed for poly(MPD-TMC) membranes, and a decrease in both water flux (73 to 36 litres/m~2 h) and NaCl rejection from (77.9% to 38.5%) for poly(CHMA-TMC) membranes were observed upon exposure to NaOCl solution for 24-360 ppmh. The observed results for the poly(MPD-TMC) membrane may be attributed to the conversion of the amide N-H group to a N-Cl group, followed by polymer degradation upon exposure to NaOCl solution. The decrease in both flux and rejection in the poly(CHMA-TMC) membrane may be due to the conversion of the hydrogen bonding amide N-H group to the stable N-Cl group in polyamide chain, which does not undergo decomposition as it contains aliphatic diamine. The infrared (IR) spectra of chlorine-exposed poly(CHMA-TMC) membranes have shown a clear split in both the amide-Ⅰ (C=O stretch) band at 1645 cm~(-1) and the amide-Ⅱ (C-N-H) band at 1543 cm~(-1), whereas a decrease in the intensities of the amide-I and amide-Ⅱ bands was observed for poly(MPD-TMC) membranes.
机译：包含聚（间苯二胺-三甲酰胺）-聚（MPD-TMC），全芳族聚酰胺-或聚-（1,3-环己烷二甲胺-三甲酰胺）-聚（CHMA-TMC），混合芳族聚酰胺的复合膜制备α-脂族聚酰胺-阻挡层，并使其暴露于不同浓度的含有2000ppm NaCl的NaOCl溶液中。聚（MPD-TMC）膜的水通量从78升/ m〜2 h增加到39％到91.3％，而盐分截留率从94％降低到91.3％，两种水通量都减少了（73-36升）暴露在NaOCl溶液中24-360 ppmh后，观察到聚（CHMA-TMC）膜的NaCl截留率从（77.9％到38.5％）（77.9％至38.5％）。聚（MPD-TMC）膜的观察结果可归因于酰胺N-H基团向N-Cl基团的转化，然后在暴露于NaOCl溶液后聚合物降解。聚（CHMA-TMC）膜中通量和截留率的降低可能是由于氢键合酰胺NH基团转变为聚酰胺链中稳定的N-Cl基团，该基团不分解，因为它含有脂肪族二胺。暴露于氯的聚（CHMA-TMC）膜的红外光谱在1645 cm〜（-1）的酰胺-Ⅰ（C = O拉伸）带和酰胺-Ⅱ（CNH）上均显示出清晰的分裂。膜在1543 cm〜（-1）处的谱带，而聚（MPD-TMC）膜的酰胺-I和酰胺-Ⅱ谱带的强度下降。

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