Fabricating superhydrophobic and oleophobic surface with silica nanoparticles modified by silanes and environment-friendly fluorinated chemicals

Many modern technologies rely on materials with controlled surface properties A key property in many of these applications is surface energy; specifically a low surface energy is often desired so 

Synthesis and Application of Fluorine-Containing Polymers with Low Surface Energy

Fluoropolymers have shown great promise in non-viral gene delivery. The current fluoropolymers developed for gene delivery are synthesized by grafting fluoroalkyls or fluoroaromatics onto cationic polymers. To expand the family of fluoropolymers for the transduction of nucleic acids, new strategies to synthesize fluoropolymers are required. In this study, we synthesized both statistical and block copolymers of poly(2-dimethylaminoethyl methacrylate) (pDMAEMA) and poly(heptafluorobutyl methacrylate) (pHFMA) via reversible addition-fragmentation chain transfer polymerization, and the transfection efficiencies of the fluorocopolymers were evaluated. The statistical fluorocopolymer exhibited dramatically higher performance in gene delivery than the block one, which is attributed to more efficient and sustained DNA uptake by the transfected cells. Moreover, the statistical copolymer of DMAEMA and HFMA showed a fluorine effect in gene delivery, and its efficiency was much superior to non-fluorinated polymers. The results revealed the structure and activity relationships of fluoropolymers consisting of DMAEMA and HFMA, and provided a new insight to guide the design of fluoropolymers for efficient gene delivery.

Statistical versus block fluoropolymers in gene delivery

Unraveling the role of surface molecular structure on vacuum flashover for fluorinated copolymers

We report the symmetry-dictated mesophase formation and phase diagram of a series of T8-polyhedral oligomeric silsesquioxane (POSS) derivatives bearing perfluoroalkyl chains and hydroxyl alkyl groups. The phase structures and phase behaviors of these molecular Janus particles were studied by DSC, POM, FT-IR, and WAXD experiments. It was found that introducing one hydroxyl alkyl group leads to a decreased crystal melting point, and incorporating two hydroxyl alkyl groups at different POSS positions causes the formation of lamellar liquid crystal mesophases with feature sizes and transition temperatures that depend on the symmetry of these regioisomers. Interestingly, installing only one substituent with two hydroxyl groups leads to monotropic phase transitions, where the mesophase appears only upon cooling from the isotropic melt within the narrow supercooling window. Phase diagrams were systematically constructed for these compounds and understood based on the fine influence of symmetry on their possible ...

Symmetry-Dictated Mesophase Formation and Phase Diagram of Perfluorinated Polyhedral Oligomeric Silsesquioxanes

Effect of groups at α-position and side-chain structure of comonomers on surface free energy and surface reorganization of fluorinated methacrylate copolymer

Due to the non-crystalline properties of short chain perfluoroalkyl groups, using short chain perfluoroalkyl to stabilize low surface free energy polymers has been a challenging task In this study, we prepare a series of random copolymers poly(perfluorohexylethyl methacrylate)-co-poly(stearyl acrylate) (P13FMA-co-PSA) and block copolymers poly(perfluorohexylethyl methacrylate)-b-poly(stearyl acrylate) (P13FMA-b-PSA), and systematically investigate the effects of the sequence structure and the content of 13FMA of the fluorinated copolymers on surface free energy and surface reorganization Static/dynamic contact angle goniometry and water/oil repellency analyses demonstrate that the random polymer P13FMA-co-PSA could not achieve low surface free energy and low surface reorganization at the same time In contrast, for the block copolymer P13FMA-b-PSA, both low surface free energy and low surface reorganization are acquired simultaneously The results of X-ray photoelectron spectroscopy (XPS), dynamic contact angle goniometry and differential scanning calorimetry (DSC) reveal the above-mentioned properties The consecutive 13FMA segments improve the surface fluorine density, while the consecutive SA chains enhance the crystallinity of the SA segments, and further hinder the surface reorganization of the perfluoroalkyl groups Therefore, P13FMA-b-PSA exhibits a higher utilization efficiency of fluorine atoms and a better structural stability than P13FMA-co-PSA

Effect of Sequence Structure on Wetting Behaviors of Fluorinated Methacrylate Polymers Based on Perfluorohexylethyl Methacrylate and Stearyl Acrylate

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Effect of groups at α-position and side-chain structure of comonomers on surface free energy and surface reorganization of fluorinated methacrylate copolymer

Effect of Sequence Structure on Wetting Behaviors of Fluorinated Methacrylate Polymers Based on Perfluorohexylethyl Methacrylate and Stearyl Acrylate