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反渗透 3

耐氯性 2

聚酰胺 2

1 1

5-戊二胺 1

PA 5X 1

代谢 1

传递阻力 1

建模 1

氧化石墨烯 1

水分子亲水性 1

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海水淡化 1

混合基质膜 1

生物基聚酰胺 1

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绿色化工 1

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非平衡分子动力学 1

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Surface-tailoring chlorine resistant materials and strategies for polyamide thin film composite reverse

《化学科学与工程前沿（英文）》 2022年第16卷第5期页码 564-591 doi: 10.1007/s11705-021-2109-z

摘要： Polyamide thin film composite membranes have dominated current reverse osmosis market on account of their excellent separation performances compared to the integrally skinned counterparts. Despite their very promising separation performance, chlorine-induced degradation resulted from the susceptibility of polyamide toward chlorine attack has been regarded as the Achilles’s heel of polyamide thin film composite. The free chlorine species present during chlorine treatment can impair membrane performance through chlorination and depolymerization of the polyamide selective layer. From material point of view, a chemically stable membrane is crucial for the sustainable application of membrane separation process as it warrants a longer membrane lifespan and reduces the cost involved in membrane replacement. Various strategies, particularly those involved membrane material optimization and surface modifications, have been established to address this issue. This review discusses membrane degradation by free chlorine attack and its correlation with the surface chemistry of polyamide. The advancement in the development of chlorine resistant polyamide thin film composite membranes is reviewed based on the state-of-the-art surface modifications and tailoring approaches which include the in situ and post-fabrication membrane modifications using a broad range of functional materials. The challenges and future directions in this field are also highlighted.

关键词： reverse osmosis polyamide thin film composite membranes chlorine resistance surface modification

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Self-healing polyamide reverse osmosis membranes with temperature-responsive intelligent nanocontainers

《化学科学与工程前沿（英文）》 2023年第17卷第9期页码 1183-1195 doi: 10.1007/s11705-022-2287-3

摘要： Improving the performance of reverse osmosis membranes remains great challenge to ensure excellent NaCl rejection while maintaining high water permeability and chlorine resistance. Herein, temperature-responsive intelligent nanocontainers are designed and constructed to improve water permeability and chlorine resistance of polyamide membranes. The nanocontainer is synthesized by layer-by-layer self-assembly with silver nanoparticles as the core, sodium alginate and chitosan as the repair materials, and polyvinyl alcohol as the shell. When the polyamide layer is damaged by chlorine attack, the polyvinyl alcohol shell layer dissolves under temperature stimulation of 37 °C, releasing inner sodium alginate and chitosan to repair broken amide bonds. The polyvinyl alcohol shell responds to temperature in line with actual operating environment, which can effectively synchronize the chlorination of membranes with temperature response and release inner materials to achieve self-healing properties. With adding temperature-responsive intelligent nanocontainers, the NaCl rejection of thin film composite membrane decreased by 15.64%, while that of thin film nanocomposite membrane decreased by only 8.35% after 9 chlorination cycles. Effective repair treatment and outstanding chlorine resistance as well as satisfactory stability suggest that temperature-responsive intelligent nanocontainer has great potential as membrane-doping material for the targeted repair of polyamide reverse osmosis membranes.

关键词： reverse osmosis nanocontainer self-healing chlorine resistance water permeability

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glycol on the crystallization, rheology and foamability of poly(lactic acid) containing generated polyamide

《化学科学与工程前沿（英文）》 2023年第17卷第12期页码 2074-2087 doi: 10.1007/s11705-023-2342-8

摘要： In this study, the rheological properties, crystallization and foaming behavior of poly(lactic acid) with polyamide 6 nanofibrils were examined with polyethylene glycol as a compatibilizer. Polyamide 6 particles were deformed into nanofibrils during drawing. For the 10% polyamide 6 case, polyethylene glycol addition reduced the polyamide 6 fibril diameter from 365.53 to 254.63 nm, owing to the smaller polyamide 6 particle size and enhanced interface adhesion. Rheological experiments revealed that the viscosity and storage modulus of the composites were increased, which was associated with the three-dimensional entangled network of polyamide 6 nanofibrils. The presence of higher aspect ratio polyamide 6 nanofibrils substantially enhanced the melt strength of the composites. The isothermal crystallization kinetics results suggested that the polyamide 6 nanofibrils and polyethylene glycol had a synergistic effect on accelerating poly(lactic acid) crystallization. With the polyethylene glycol, the crystallization half-time reduced from 103.6 to 62.2 s. Batch foaming results indicated that owing to higher cell nucleation efficiency, the existence of polyamide 6 nanofibrils led to a higher cell density and lower expansion ratio. Furthermore, the poly(lactic acid)/polyamide 6 foams exhibited a higher cell density and expansion ratio than that of the foams without polyethylene glycol.

关键词： poly(lactic acid) foaming microfibrillation rheological property crystallization

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含氧化石墨烯混合基质反渗透复合膜的制备及性能研究

芦瑛,赵海洋,张林,侯立安

《中国工程科学》 2014年第16卷第7期页码 84-88

摘要：

以间苯二胺(MPD)为水相单体、均苯三甲酰氯(TMC)为油相单体，氧化石墨烯（GO）作为水相添加物，采用界面聚合法，制备了GO-PA（聚酰胺）/PSF（聚砜）混合基质反渗透复合膜。采用扫描电子显微镜表征了膜形貌，考察了该膜对氯化钠的截留性能及耐氯性。结果表明，聚酰胺反渗透膜填充氧化石墨烯后，其分离性能优于聚酰胺膜，且具有较好的耐氯性。随着氧化石墨烯含量的增加，膜的通量增大，当添加量为0.005 %时，膜具有最大通量，为63 L/(m²·h)。

关键词：氧化石墨烯聚酰胺混合基质膜反渗透耐氯性

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Preparation and rheological behaviors of PA6/SiO2 nanocompiste

WEI Shanshan, LIU Yuejun, LI Xianggang, HUANG Yugang, WANG Xiayu, ZHANG Ping

《化学科学与工程前沿（英文）》 2007年第1卷第4期页码 332-337 doi: 10.1007/s11705-007-0060-2

摘要： The polyamide 6 (PA6)/SiO nanocomposites were prepared by in situ polymerization and the rheological behaviors were investigated. The morphology of resultant materials was characterized by scanning electron microscopy (SEM) and the rheological behaviors were characterized by capillary rheometer. The results showed that the SiO particle size was around 50 nm and the particles dispersed evenly in PA6 matrix. The nanocomposites were pesudoplastic fluids and the apparent viscosities of nanocomposites increased initially and then decreased with the increase in nano-SiO content at the same temperature. The non-Newtonian indexes of nanocomposites were smaller than those of pure PA6. With the increase in nano-SiO content the apparent viscous activation energies of nanocomposites increased initially and then decreased. The rheological behaviors revealed that there were strong interactions between PA6 macromolecule chains and nano-SiO particles.

关键词： polyamide temperature rheological activation pesudoplastic

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海水淡化反渗透耐氯膜材料的研究与制备进展

黄海,张林,侯立安

《中国工程科学》 2014年第16卷第7期页码 89-94

摘要：

反渗透是重要的海水淡化技术，本文针对反渗透膜易被水中活性氯破坏导致性能下降的问题，介绍了聚酰胺反渗透膜氯化降解理论，并深入探讨了国内外对耐氯反渗透膜材料的研究与开发现状，讨论了耐氯反渗透膜的研究方向和发展前景。

关键词：海水淡化水处理反渗透聚酰胺耐氯性膜材料

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1,5-戊二胺的细菌合成及应用 Review

马伟超, 陈可泉, 李艳, 郝宁, 王昕, 欧阳平凯

《工程（英文）》 2017年第3卷第3期页码 308-317 doi: 10.1016/J.ENG.2017.03.012

摘要：

1,5-戊二胺是一种广泛分布于原核和真核生物中的具有多种生物活性的天然多胺，正日益成为一种重要的工业化学品，并在多个领域展现出广泛的应用前景，特别是作为单体用于合成生物基聚酰胺。基于1,5-戊二胺的聚酰胺5X 具有优异的性能和环境友好特性，因而有广泛的应用前景。本文总结了近期关于1,5-戊二胺在细菌中的生物合成、代谢及生理学功能，着重介绍了1,5-戊二胺在大肠杆菌的代谢调控机制。文中还综述了微生物发酵法和全细胞催化法生产1,5-戊二胺的进展及1,5-戊二胺的分离纯化方法。此外，对1,5-戊二胺在生物基聚酰胺合成中的应用进行了总结，并对利用可再生资源生产1,5-戊二胺进行了展望和对以后的研究提出了建议。

关键词： 1 5-戊二胺代谢细菌生产生物基聚酰胺 PA 5X

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聚酰胺反渗透膜中水传递阻力的分子模拟——界面阻力和内部阻力 Article

宋阳, 魏明杰, 徐放, 汪勇

《工程（英文）》 2020年第6卷第5期页码 577-584 doi: 10.1016/j.eng.2020.03.008

摘要：

在分子水平上理解水分子在聚酰胺（PA）反渗透（RO）膜中的传递阻力对于这些膜的设计、制备和应用具有非常重要的指导意义。本文通过分子模拟来计算总传递阻力，并将其分成两部分——内部阻力和界面阻力。内部阻力取决于PA层的厚度，而界面阻力则不然。基于5 nm 厚的PA层的模拟显示界面阻力对总阻力的贡献率很大（> 62%）。然而，现实世界中，对于具有200 nm PA层的RO膜，界面阻力起次要作用，其贡献率低于10%。这表明，当使用典型方法估算RO膜的传递阻力时，存在不准确的风险，因为该方法简单地将5 nm厚的PA层的总阻力进行倍增，使得界面阻力被错误放大。此外，界面阻力和内部阻力均取决于PA层的化学性质。我们的模拟显示，减少PA层中剩余羧基的数量会导致内部阻力降低，因此，可以在不牺牲离子截留的情况下改善水的渗透性，这与实验结果高度吻合。

关键词：传递阻力反渗透非平衡分子动力学水分子亲水性建模