以物理披覆改質方式製備低結垢過濾膜及其抗生物分子吸附之量測;The Fabrication and Properties Measurement of Antifouling Polymer Coating Membranes

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题名:	以物理披覆改質方式製備低結垢過濾膜及其抗生物分子吸附之量測;The Fabrication and Properties Measurement of Antifouling Polymer Coating Membranes
作者:	阮若屈
贡献者:	化學工程與材料工程學系
关键词:	研究領域：化學工程類
日期:	2011-08-01
上传时间:	2012-01-17 17:22:59 (UTC+8)
出版者:	行政院國家科學委員會
摘要:	市售的超過濾薄膜多具有良好化學穩定性與機械強度，但皆缺乏抗生物結垢的特性。現今超過濾薄膜大多數以polyvinyldifluoride (PVDF) 及polysulfone (PSF)製成，可是由本身疏水性質與表面自由能低，以致濾水阻力極大，因此常於製膜時加入少量 polyvinylpyrrolidone 或sodium dodecyl sulfate 使得膜面變得親水，但即使如此，當應用於生物分子時，仍容易產生生物分子(如蛋白質、腐植酸)的貼附，造成通量大幅度下降，且其造成的阻塞，難以逆洗去除，藥洗效果也不佳。以往曾有少許低生物結垢薄膜的研究，多半以掺和，共聚合或表面鍵結方式，將含有降低生物結垢的poly(ethyleneglycol) (PEG)的高分子加入，但要不效果不彰，要不難以大規模實施。有鑑於此，本研究計畫擬以表面物理披覆方式將含有PEG 的高分子覆於膜上。其方法乃將 poly(ethyleneglycol)methacrylate 單體與疏水性單體合成兩性(amphiphilic)高分子，並用表面披覆的方式披覆於疏水的PVDF 超過濾薄膜上，以期疏水部份貼於PVDF，而抗結垢的PEG 暴露於表面。此方法將不會改變原本薄膜製做的配方與製程，也適於大面積大規模的實施。雖然表面披覆方式具有上述優點，但最大問題應該在於如何使低結垢高分子緊密貼覆於薄膜且又具有良好低結垢性質 ? 我們將嘗試改變單體適當比例方向著手；另外若是相同單體比例下，不同的合成方式也可能造成披覆能力與抗結垢能力的不同，因此我們也將探討random co-polymer 與diblock copolymer 的不同。另外，當薄膜應用於廢水回收或地表水飲用化處理時，其微生物在高分子薄膜上的沾黏行為非常複雜，我們在短期實驗中，發現微生物於負電性表面較難貼附，而正電性表面易造成微生物死亡沾黏在表面。為找尋可長期抗菌的膜面，我們擬製備出薄膜表面帶正電、負電、電中性的薄膜，長時間測試膜電性對細菌與藻類貼附的影響。 Commercial ultrafiltration membranes own good chemical resistance and high mechanical strength but often lack ability to resist bio-fouling. Most ultrafiltration membranes are made from hydrophobic polyvinyldifluoride (PVDF) or polysulfone (PSF). In order to improve their water permeability, small amount of polyvinylpyrrolidone or sodium dodecyl sulfate was added to increase surface hydrophilicity. However, such membranes still cannot resist the fouling from biomolecules of different charges. It will be difficult to clean the bio-fouled membranes by back-washing. The foul cannot even be removed by chemical cleaning. Limited attempts were taken to synthesize membranes resisting bio-fouling. Most of them added antifouling molecule - polyethyleneglycol (PEG) in the membranes. One of the approaches was to blend the PEG containing polymers into the casting solution of membranes. The antifouling ability was then limited by the amount of PEG can be added. Another approach was to graft PEG on the membrane surface. But it was difficult to scale-up this process. Therefore, we intend to prepare antifouling membranes by surface coating. The idea is to synthesize polymers containing both PEG and hydrophobic monomers. The hydrophobic monomers are used to attach to membrane surface by hydrophobic interaction. The PEG moiety is then exposed to the water environment. It is considered that this approach can be easily scale-up and the anti-fouling capability can be optimized. The difficulty of this approach will be how to optimize the attachment of PEG containing polymers and simultaneously keep the antifouling capability of PEG. We need to adjust the ratio of PEG and hydrophobic monomers and coating thickness of the polymers. In addition, diblock and random copolymerized polymers are also compared. To resist microorganism attachment is also an important subject. We have tried to investigate the effects of surface charges on bacterial adsorption. Short time observations showed that negatively charged surface could resist bacterial adsorption. Positively charged surface could kill the adsorbed bacteria. It is interesting to do long time observation to find a suitable membrane for membrane bioreactor. We therefore try to synthesize positively charged, zwitterionic, and negatively charged amphiphilic polymers to coat on ultrafiltration membranes. Both the attachment of bacteria and algae are under investigation. 研究期間：10008 ~ 10107
關聯:	財團法人國家實驗研究院科技政策研究與資訊中心
显示于类别:	[化學工程與材料工程學系 ] 研究計畫

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