調整無規共聚物的分子設計以提升薄膜材料抗 生物沾粘的特性

Tuning the molecular design of random copolymers for enhancing the biofouling mitigation of membrane materials

葉佐軒(Tso-Hsuan Yeh)

指導教授 ： 費安東 ； 張雍

中原大學/工學院/化學工程研究所/碩士(2019年)

https://doi.org/10.6840/cycu201900508

摘要

本研究中，我們合成了一種由苯乙烯和乙二醇甲基丙烯酸酯單元（PS-co-PEGMA）製成的防污共聚物，並對其摩爾比和分子鏈長進行微調，使薄膜從低生物污垢轉變為幾乎完全抗污染。首先，製備一組分子量在相同範圍但不同組成的7種共聚物，並通過混摻改質聚（偏二氟乙烯）（PVDF）膜並用氣相誘導相分離（VIPS）方法製備薄膜。所有的薄膜鑑定之後，並用大腸桿菌，嗜麥芽寡養單胞菌和纖維蛋白原進行防污試驗，均表明共聚物（PS30P70）中30mol％的聚苯乙烯含量導致最佳的防污性能。增加或減少苯乙烯的量分別導致材料的疏水性增加或改質的穩定性降低，這兩種情況下的結果都是更高的生物污損。然後，製備5種具有固定組成但分子量不同的共聚物，防污試驗表明分子鏈越長，防污性能越好。通過FT-IR鑑定和DSC測量，發現鏈長對於水合層的強度是必要的。

關鍵字

分子設計 ； 抗沾粘材料 ； 生物沾粘 ； 多孔薄膜 ； 水合層

並列摘要

In this study, we synthesis different PS/PEGMA molar ratio and different molecular weight of copolymer Poly(styrene)-Poly(ethylene glycol)methyl ether methacrylate, (PS-random-PEGMA) blending with Polyvinylidene fluoride. Form the porous antifouling membrane by vapor-induced phase separation, VIPS, Explore the effect of PS/PEGMA molar ratio and molecular weight on antifouling properties. The membrane which prepared by VIPS exhibited high porosity and bi-continuous structure. We use Fourier-transform infrared spectroscopy to observe the PS-PEGMA well blending on the membrane surface at 1730 cm-1. In the hydrophilicity test, as the ratio of the PEGMA increase, the membrane has a lower water contact angle and higher hydration capacity, but the stability will gradually decrease. In the biofouling test, the modified hydrophilic membrane has good antifouling properties, while the PS30-r-PEGMA70 membrane has both antifouling properties and high stability. So in the second stage of the experiment. We synthesize different molecular weight of PS30-r-PEGMA70 copolymers blend with PVDF to observe the effect of molecular weight on the antifouling properties. In the hydrophilicity test, the membrane of different copolymer molecular weights has good hydrophilicity. From the FTIR analysis and differential scanning calorimetry, PS30-r-PEGMA70 exhibits a more stable hydration layer and contains more non-freezable water with increasing molecular weight, so it was chosen to be tested in anti-fouling test. As the molecular weight of PS30-r-PEGMA70 increases, the modified membrane exhibits better anti-fouling properties.

並列關鍵字

Molecular design ； antifouling copolymer ； biofouling ； porous membrane ； hydration

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