APPLIED SURFACE SCIENCE
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2021
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IF 6.707
Hailiang Liu,Yueming Liu,Yang Qin,Yan Huang,Kaikai Chen,Changfa Xiao
Inspired of the synergistic effect of the antifouling performance of hydrophilic substance and the self-cleaning function of low surface energy material, we designed and synthesized a kind of macromolecule amphiphilic graft copolymer by the free radical polymerization, which used polyvinyl chloride (PVC) as the main chains, poly(ethylene glycol) methacrylate (PEGMA) as the hydrophilic segment and trifluoroethyl methacrylate (TFEMA) as the low surface energy segment. Then, the amphiphilic PVC-g-PPEGMA/PTFEMA graft copolymer membrane was successfully prepared via surface segregation through the phase inversion process and was further optimized via the forced self-assembly through annealing treatments. The results showed that the PPEGMA chain segments migrated on the membrane surface which driven the PTFEMA chain segments to enrich on the membrane surface during the annealing process, meanwhile, annealing treatment promoted the local microphase separation and improved the mean pore size and the porosity. Based on the synergistic effect of hydrophilic and low surface energy segments, the PVC-g-PPEGMA/PTFEMA graft copolymer membrane obtained the maximum pure water flux of 510.69 ± 16.28 L∙m −2 ∙h −1 , flux recovery rate of 91.49% and rejection rate of 99.31% in the BSA filtration process, which also revealed significantly antifouling properties. More importantly, the PVC-g-PPEGMA/PTFEMA copolymer membrane exhibited long-time hydrophilic stability, which could extend its potential service life.
研究领域:
材料科学
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膜技术
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2026
·
IF 5.1
Wanqing Wu,Zhipeng Zhang,Xinping Shen,Xianhe Liu,Xinxin Li
Controlling molecular architecture and interfacial interactions is critical for realizing well-defined microphase-separated structures in block copolymer systems. Here, we investigate poly(2,2,2-trifluoroethyl methacrylate)-block-poly(2-vinylpyridine) (PTFEMA- b -P2VP) as a high-χ platform enabled by strong repulsive interactions between fluorinated and polar blocks. A series of low-degree-of-polymerization PTFEMA- b -P2VP diblock copolymers was synthesized via reversible addition–fragmentation chain-transfer (RAFT) polymerization. Molecular dynamics simulations indicate a high Flory-Huggins interaction parameter (χ ≈ 0.3 at 150 °C), leading to rapid microphase separation into ordered lamellar morphologies within 15 min at 100 °C. Small-angle X-ray scattering measurements reveal lamellar spacings of 17.9 - 32.7 nm, corresponding to feature sizes down to approximately 9 nm, demonstrating the suitability of this system for sub-10 nm directed self-assembly (DSA). Despite the strong segregation strength, the large surface-energy contrast between the two blocks induces a pronounced preference for parallel lamellar orientation at solid interfaces, which limits perpendicular alignment. To address this interfacial constraint, we introduce a matched neutral underlayer strategy using random copolymer brushes chemically analogous to the constituent blocks of PTFEMA -b- P2VP, incorporating glycidyl methacrylate (GMA) as a cross-linkable third monomer. These underlayers effectively balance interfacial interactions, enabling robust perpendicular lamellar orientation during solvent-thermal annealing. Furthermore, combining the neutral underlayers with grapho-epitaxial templates enables directed self-assembly of well-ordered line patterns with linewidths of ∼10–12 nm. This work thus establishes a practical and materials-efficient route for achieving perpendicular lamellar orientation in fluorinated block copolymers and other high-χ systems, providing a general and transferable strategy for DSA and related nanofabrication technologies that demand precise nanoscale morphology control.
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry B
·
2014
·Vol. 3
·期 4
·629-634
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IF 0
Xinhong Xiong,Zhaoqiang Wu,Jingjing Pan,Lulu Xue,Yajun Xu,Hong Chen
Tailoring the surface properties of poly(dimethylsiloxane) (PDMS) is essential for the advancement of its applications. However, the modification process is usually complicated and limited due to the chemical inertness of the surfaces of PDMS. Here, we report for the first time, a facile and versatile method for the functional surface modification of PDMS via visible light-induced grafting polymerization at room temperature. This modification is readily achieved in two steps: (1) covalently integrating alkyl bromine into the PDMS networks using a simple mixing procedure and (2) visible light-induced surface grafting polymerization using Mn2(CO)10. We have demonstrated that the PDMS surface can be functionalized with a wide variety of polymers via covalent grafting, such as poly(trifluoroethyl methacrylate) (PTFEMA), poly(N-isopropylacrylamide) (PNIPAAm), poly(acrylic acid) (PAA) and poly(vinyl acetate) (PVAc). As an example, after the grafted PVAc was transformed into its hydrophilic analogue poly(vinyl alcohol) (PVA), anti-biofouling functionalization of PDMS was obtained. The anti-biofouling properties of the functionalized PDMS were demonstrated using cell adhesion and bacterial adhesion tests. Moreover, the grafting kinetics of PVAc showed that this process was fast and efficient.
研究领域:
材料科学
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聚合物化学
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表面工程
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DOI
PubMed
POLYMER
·
2018
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IF 3.483
Hao Xu,Ailian Wang,Xu Liu,Di Feng,Shi Wang,Jie Chen,Yan An,Liaoyun Zhang
The trade-off between ionic conductivity and mechanical strength is still a great challenge for all-solid-state polymer electrolyte . Herein, a novel structure-controlled fluorine-containing star-branched polymer (HBPS-(PTFEMA- b -PPEGMA) 27 ) with a hyperbranched polystyrene core and polytrifluoroethyl methacrylate-block-poly (ethylene glycol) methyl ether methacrylate arms is synthesized by atom transfer radical polymerization . Combining the good mechanical strength of fluorine-containing segments and flexible property of PEG segments, the prepared HBPS-(PTFEMA- b -PPEGMA) 27 /LiTFSI solid polymer electrolyte can form flexible transparent self-standing membrane and exhibits the high ionic conductivity of 2.4 × 10 −5 S cm -1 at 25 °C, as well as good thermal stability with the thermal decomposition temperature of 374.7 °C. It also possesses a wide electrochemical window of 4.9 V and good interfacial compatibility. Moreover, the Li/LiFePO 4 cell based on this solid state star-branched polymer electrolyte membrane delivers a high discharge capacity of 147.2 mAh g −1 under a current density of 0.1C at 60 °C.
研究领域:
材料科学
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电化学
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聚合物化学
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能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）