- Designable synthesis of nanocomposite hydrogels with excellent mechanical properties based on chemical cross-linked interactions
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A new type of nanocomposite hydrogels based on covalent cross-linked interactions with excellent mechanical properties and good stability has been prepared by using in situ free-radical polymerization; polystyrene nanoparticles with photo-activity are used as the cross-linking agent. The Royal Society of Chemistry.
- Wu, Yongtao,Xia, Mengge,Fan, Qingqing,Zhu, Meifang
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- Ultrafast Water Transport in Two-Dimensional Channels Enabled by Spherical Polyelectrolyte Brushes with Controllable Flexibility
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Fast water transport channels are crucial for water-related membrane separation processes. However, overcoming the trade-off between flux and selectivity is still a major challenge. To address this, we constructed spherical polyelectrolyte brush (SPB) structures with a highly hydrophilic polyelectrolyte brush layer, and introduced them into GO laminates, which increased both the flux and the separation factor. At 70 °C, the flux reached 5.23 kg m?2 h?1, and the separation factor of butanol/water increased to ≈8000, which places it among the most selective separation membranes reported to date. Interestingly, further studies demonstrated that the enhancement of water transport was not only dependent on the hydrophilicity of the polyelectrolyte chains, but also influenced by their flexibility in the solvent. Quartz crystal microbalance with dissipation and molecular dynamics simulations revealed the structure-performance correlations between water molecule migration and the flexibility of the ordered polymer chains in the 2D confined space.
- Dai, Liheng,Guo, Xuhong,Huang, Kang,Jin, Wanqin,Qu, Kai,Wang, Yixing,Wu, Yulin,Xia, Yongsheng,Xin, Li,Xiong, Zhaodi,Xu, Fang,Xu, Zhi,Zhang, Dezhu
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- Method for preparing polymerizable photoinitiators
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The invention discloses a method for preparing polymerizable photoinitiators. The polymerizable photoinitiators are prepared from methacrylic acid and 2-hydroxyl-4'-(2'-hydroxyethoxy)-2-methyl propiophenone by the aid of direct esterification processes. The use quantity of polymerization inhibitors in a reaction system accounts for 0.01%-0.5% of the mass of the methacrylic acid, the use quantity of methane sulfonic acid which is a catalyst accounts for 0.1%-2% of the mass of the methacrylic acid, and a molar proportion of the methacrylic acid to the 2-hydroxyl-4'-(2'-hydroxyethoxy)-2-methyl propiophenone is 1:1-1.2. Each polymerization inhibitor is methoxyphenol or hydroquinone or 2-tertiary butylhydroquinone, and a solvent is toluene or dimethylformamide or tetrahydrofuran. The method has the advantages that the polymerizable photoinitiators are excellent in compatibility with monomers and resin in photo-curing systems fragments obtained after the polymerizable photoinitiators are subjected to illumination pyrolysis are low in migration rate in cured films and are anti-yellowing, excellent initiation effects can be realized, and the method can be applied to the field of photo-cured coating, printing ink, adhesive and the like; the method for synthesizing the polymerizable photoinitiators is low in cost, processes for preparing the polymerizable photoinitiators are simple and convenient, and obvious application effects can be realized.
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Paragraph 0019; 0020
(2016/11/17)
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- Copolymerizable photoinitiators
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The invention relates to copolymerizable photoinitiators of the general formula I STR1 in which R1 and R2 are each H, C1 -C6 -alkyl or phenyl, R3 is H, C1 -C6 -alkyl, C1 -C6 -alkyl, C1 -C6 -alkanoyl or the group Z, R4 is H, halogen, C1 -C12 -alkyl, C1 -C12 -alkoxy, C1 -C12 -alkylthio or the group --X[(CH2 --CH2 --O)n --Z]m and X os O, S or N n is an integer from 0 to 4, m is the integer 1 for X=O and S or the integer 1 or 2 for X=N, Z is the group --CO--CR=CR'R" with R, R', R" each being H or CH3, always at least one of the R3 or R4 groups containing the group Z.
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