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Microstructure and Antibacterial Activity of Phosphonium Montmorillonites
Xie, Agui,Yan, Wenyan,Zeng, Xianshen,Dai, Guangjian,Tan, Shaozao,Cai, Xiang,Wu, Ting Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.6
Phosphonium montmorillonites (P-MMTs) were prepared by intercalating dodecyl tributyl phosphonium salt into sodium montmorillonite (Na-MMT) through an ion-exchange method. Microstructure and antibacterial activity of phosphonium montmorillonites were studied by FT-IR, TGA, XRD and Minimum Inhibitory Concentration (MIC), respectively. The results show that phosphonium montmorillonites exhibit higher thermal stability than conventional ammonium montmorillonites, the onset temperature of decomposition is higher than 300 $^{\circ}C$, and the basal spacing of phosphonium montmorillonites is enlarged compared to that of sodium montmorillonite. Phosphonium montmorillonites also show good antibacterial activity with the MIC against E. coli and S. aureus of 150 and 50 $mg{\cdot}L^{-1}$, respectively.
Microstructure and Antibacterial Activity of Phosphonium Montmorillonites
Agui Xie,Xiang Cai,Ting Wu,Guangjian Dai,Xianshen Zeng,Wenyan Yan,Shaozao Tan 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.6
Phosphonium montmorillonites (P-MMTs) were prepared by intercalating dodecyl tributyl phosphonium salt into sodium montmorillonite (Na-MMT) through an ion-exchange method. Microstructure and antibacterial activity of phosphonium montmorillonites were studied by FT-IR, TGA, XRD and Minimum Inhibitory Concentration (MIC), respectively. The results show that phosphonium montmorillonites exhibit higher thermal stability than conventional ammonium montmorillonites, the onset temperature of decomposition is higher than 300 ^oC, and the basal spacing of phosphonium montmorillonites is enlarged compared to that of sodium montmorillonite. Phosphonium montmorillonites also show good antibacterial activity with the MIC against E. coli and S. aureus of 150 and 50 mg·L^(-1), respectively.
Liujun Shi,Wei Hu,Yongjin He,Yu Ke,Gang Wu,Meng Xiao,Langhuan Huang,Shaozao Tan 한국고분자학회 2020 Macromolecular Research Vol.28 No.4
Amphiphilic triblock copolymers, poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) as a hydrophobic block and poly(ethylene glycol) (PEG) as a hydrophilic block, were successfully synthesized, with an aim to broaden the potential application of PHBV in biomedical areas. Isophorone diisocyanate having two different reactive isocyanate groups was used as the coupling agent. Telechelic hydroxylated PHBV was prepared by alcoholysis reaction, isocyanate modified and finally reacted with PEG. Molecular weight of triblock copolymer increased with the increasing molecular weight of PHBV-diol and PEG. The length of the PHBV block and PEG block had a great influence on the crystallization behavior of the triblock copolymers. Thermal degradation temperature of PHBV segment enhanced greatly. The triblock copolymer showed a tendency toward formation of aggregation in aqueous solution with a critical aggregation concentration of 5.01×10-4 g·L−1, and the rod-shape assembly with a uniform hydrophilic shell might be employed as hydrophobic drug delivery systems.