Environmental Functional Materials and Water Treatment Laboratory, Department of Rural Systems Engineering, Seoul National University, Seoul, 08826, Republic of Korea.
Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul, 08826, Republic of Korea.
Sci Rep. 2019 Jan 23;9(1):383. doi: 10.1038/s41598-018-36479-w.
Poly(vinylidene fluoride) (PVDF) is common polymer for electrospinning, however, its high hydrophobicity is a major drawback, which cause fouling. To introduce hydrophilicity and antibacterial activity, quaternary ammonium-functionalized amphiphilic diblock copolymers were synthesized and blended with a PVDF/graphene oxide (GO) solution, then, electrospun and coated with a hydrophilic polymer, poly(vinyl alcohol) (PVA). The amphiphilic block copolymer, consisting of a hydrophobic poly(methyl methacrylate) block and a hydrophilic poly[N,N-2-(dimethylamino)-ethyl methacrylate) block (PMMA-b-PDMAEMA), was synthesized. Polymeric quaternary ammonium with three different alkyl chain lengths (C, C, and C) were successfully introduced to obtain as q-PMMA-b-PDMAEMA. The q-PMMA-b-PDMAEMA in the nanofiber matrix was confirmed by C=O bands (1734 cm) in the Fourier transform infrared spectra. Nano-sized spherical protuberances were distributed on the surface as revealed by field emission scanning and transmission electron microscopies. The PVDF/GO/q-PMMA-b-PDMAEMA@PVA nanofibers has superhydrophilic properties (water contact angle = 0-20°) and the pure water flux was generally improved by increasing the alkyl chain length. When introducing the longest alkyl chain (C), the total fouling ratio was the lowest (49.99%) and the bacteria removal capacities after 60 min were the highest for both Escherichia coli (4.2 × 10 CFU/mg) and Staphylococcus aureus (6.1 × 10 CFU/mg) via growth inhibition and cytoplasmic membrane damage.
聚偏二氟乙烯（PVDF）是常用的静电纺丝聚合物，但它的高疏水性是一个主要缺点，会导致污垢。为了引入亲水性和抗菌活性，合成了季铵功能化的两亲性嵌段共聚物，并与 PVDF/氧化石墨烯（GO）溶液混合，然后进行静电纺丝，并涂覆亲水性聚合物聚乙烯醇（PVA）。该两亲嵌段共聚物由疏水性聚甲基丙烯酸甲酯（PMMA）嵌段和亲水性聚[N,N-2-（二甲氨基）乙基甲基丙烯酰胺（PDMAEMA）嵌段组成。成功引入了具有三种不同烷基链长度（C、C 和 C）的聚合季铵盐，得到 q-PMMA-b-PDMAEMA。傅里叶变换红外光谱中的 C=O 带（1734 cm）证实了 q-PMMA-b-PDMAEMA 存在于纤维基质中。场发射扫描和透射电子显微镜显示，纳米级的球形突起分布在表面上。PVDF/GO/q-PMMA-b-PDMAEMA@PVA 纳米纤维具有超亲水性（水接触角为 0-20°），并且随着烷基链长度的增加，纯水通量通常会提高。当引入最长的烷基链（C）时，总污染率最低（49.99%），大肠杆菌（4.2×10 CFU/mg）和金黄色葡萄球菌（6.1×10 CFU/mg）的细菌去除率在 60 分钟后最高，这是通过生长抑制和细胞质膜损伤实现的。
