Modification of poly(tetrafluoroethylene)(PTFE) films with 2-methacryloyloxyethyl phosphorylcholine(MPC) was performed by low-temperature plasma treatment and grafting polymerization.Surface properties of PTFE were ch...Modification of poly(tetrafluoroethylene)(PTFE) films with 2-methacryloyloxyethyl phosphorylcholine(MPC) was performed by low-temperature plasma treatment and grafting polymerization.Surface properties of PTFE were characterized by attenuated total reflectance Fourier transform infrared(ATR-FTIR) spectra,X-ray photoelectron spectroscopy(XPS) ,and static contact angle.The results show that MPC has been grafted onto PTFE film surface successfully.Contact angle for the modified PTFE films in the water decreased from 108°to 58.25°,while surface energy increased from 17.52 mN/m to 45.47 mN/m.The effects of plasma treatment time,monomer concentration and grafting time on degree of grafting were determined.In the meanwhile,blood compatibility of the PTFE films was studied by checking thrombogenic time of blood plasma.展开更多
为改善纯钛表面的抗凝血性能,合成了一系列磷酸胆碱仿生聚合物,并在其表面构建了稳定的仿生涂层,通过一系列实验、表征和评价优化出更有利于钛材表面改性的磷酸胆碱聚合物。首先采用简单的自由基聚合法和羧基与氨基的反应,分两步合成了...为改善纯钛表面的抗凝血性能,合成了一系列磷酸胆碱仿生聚合物,并在其表面构建了稳定的仿生涂层,通过一系列实验、表征和评价优化出更有利于钛材表面改性的磷酸胆碱聚合物。首先采用简单的自由基聚合法和羧基与氨基的反应,分两步合成了5种不同比例的2-甲基丙烯酰氧乙基磷酰胆碱(MPC)、甲基丙烯酸(MA)和多巴胺(DA)的无规共聚(PMMDA3-Q、PMMDA3-T、PMMDA5-Q、PMMDA5-T、PMMDA7),并通过FTIR、1 H NMR、GPC以及UV-Vis等完成了定性、定量表征和分析。通过自组装的方式,将5种不同聚合物分别组装到钛表面,并采用QCM-D、AFM及血小板粘附实验考察了5种聚合物在钛表面的组装量、表面粗糙度以及改性后的钛表面抗血小板粘附及抑制血小板激活的能力。结果表明,聚合物PMMDA7更适合作为钛材表面改性聚合物,为构建磷酸胆碱仿生多功能涂层提供了实验基础和方法。展开更多
The synergistic effect of polyethylene glycol(PEG)and poly(2-methacry-loyloxyethyl phosphorytcholine)(PMPC)can effectively reduce the protein absorption,which is beneficial to theranostics.However,PEG-PMPC-based polym...The synergistic effect of polyethylene glycol(PEG)and poly(2-methacry-loyloxyethyl phosphorytcholine)(PMPC)can effectively reduce the protein absorption,which is beneficial to theranostics.However,PEG-PMPC-based polymers have rarely been used as nanocarriers in the theranostic field due to their limited modifiability and weak interaction with other materials.Herein,a plain method was proposed to endow them with the probable ability of loading small active agents,and the relationship between the structure and the ability of loading hydrophobic agents was explored,thus expanding their applications.Firstly,mPEG-PMPC or 4-arm-PEG-PMPC polymer was synthesized by atom transfer radical polymerization(ATRP)using mPEG-Br or 4-arm-PEG-Br as the macroinitiator.Then a strong hydrophobic segment,poly(butyl methacrylate)(PBMA),was introduced and the ability to load small hydrophobic agents was further explored.The results showed that linear mPEG-PMPC-PBMA could form micelles 50-80 nm in size and load the hydrophobic agent such as Nile red efficiently.In contrast,star-like 4-arm-PEG-PMPC-PBiyiA,a monomolecular micelle(10-20 nm),could hardly load any hydrophobic agent.This work highlights effective strategies for engineering PEG-PMPC-based polymers and may facilitate the further application in numerous fields.展开更多
文摘Modification of poly(tetrafluoroethylene)(PTFE) films with 2-methacryloyloxyethyl phosphorylcholine(MPC) was performed by low-temperature plasma treatment and grafting polymerization.Surface properties of PTFE were characterized by attenuated total reflectance Fourier transform infrared(ATR-FTIR) spectra,X-ray photoelectron spectroscopy(XPS) ,and static contact angle.The results show that MPC has been grafted onto PTFE film surface successfully.Contact angle for the modified PTFE films in the water decreased from 108°to 58.25°,while surface energy increased from 17.52 mN/m to 45.47 mN/m.The effects of plasma treatment time,monomer concentration and grafting time on degree of grafting were determined.In the meanwhile,blood compatibility of the PTFE films was studied by checking thrombogenic time of blood plasma.
文摘为改善纯钛表面的抗凝血性能,合成了一系列磷酸胆碱仿生聚合物,并在其表面构建了稳定的仿生涂层,通过一系列实验、表征和评价优化出更有利于钛材表面改性的磷酸胆碱聚合物。首先采用简单的自由基聚合法和羧基与氨基的反应,分两步合成了5种不同比例的2-甲基丙烯酰氧乙基磷酰胆碱(MPC)、甲基丙烯酸(MA)和多巴胺(DA)的无规共聚(PMMDA3-Q、PMMDA3-T、PMMDA5-Q、PMMDA5-T、PMMDA7),并通过FTIR、1 H NMR、GPC以及UV-Vis等完成了定性、定量表征和分析。通过自组装的方式,将5种不同聚合物分别组装到钛表面,并采用QCM-D、AFM及血小板粘附实验考察了5种聚合物在钛表面的组装量、表面粗糙度以及改性后的钛表面抗血小板粘附及抑制血小板激活的能力。结果表明,聚合物PMMDA7更适合作为钛材表面改性聚合物,为构建磷酸胆碱仿生多功能涂层提供了实验基础和方法。
基金supported by the National Natural Science Foundation of China(Grant Nos.51673146,51673144 and 51773151).
文摘The synergistic effect of polyethylene glycol(PEG)and poly(2-methacry-loyloxyethyl phosphorytcholine)(PMPC)can effectively reduce the protein absorption,which is beneficial to theranostics.However,PEG-PMPC-based polymers have rarely been used as nanocarriers in the theranostic field due to their limited modifiability and weak interaction with other materials.Herein,a plain method was proposed to endow them with the probable ability of loading small active agents,and the relationship between the structure and the ability of loading hydrophobic agents was explored,thus expanding their applications.Firstly,mPEG-PMPC or 4-arm-PEG-PMPC polymer was synthesized by atom transfer radical polymerization(ATRP)using mPEG-Br or 4-arm-PEG-Br as the macroinitiator.Then a strong hydrophobic segment,poly(butyl methacrylate)(PBMA),was introduced and the ability to load small hydrophobic agents was further explored.The results showed that linear mPEG-PMPC-PBMA could form micelles 50-80 nm in size and load the hydrophobic agent such as Nile red efficiently.In contrast,star-like 4-arm-PEG-PMPC-PBiyiA,a monomolecular micelle(10-20 nm),could hardly load any hydrophobic agent.This work highlights effective strategies for engineering PEG-PMPC-based polymers and may facilitate the further application in numerous fields.
