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
This investigation deals with the free radical polymerization both of (2-methacryloyloxyethyl) trimethyl ammonium chloride (QACEMA) and of diallyldimethyl ammonium chloride (DADMAC) in inverse emulsion. The influences...This investigation deals with the free radical polymerization both of (2-methacryloyloxyethyl) trimethyl ammonium chloride (QACEMA) and of diallyldimethyl ammonium chloride (DADMAC) in inverse emulsion. The influences of some factors, such as the concentration of monomers, initiator and emulsifier are discussed. The polymerization rate equations of above two monomers can be written as follows: R(p) = k[M](1.21)[I](0.82)[E](0.57) (for QACEMA) R(p) = k'[M](1.34)[I](0.90)[E](0.62) (for DADMAC)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.
基金This project is supported by Tianjin Science Foundation for Youths.
文摘This investigation deals with the free radical polymerization both of (2-methacryloyloxyethyl) trimethyl ammonium chloride (QACEMA) and of diallyldimethyl ammonium chloride (DADMAC) in inverse emulsion. The influences of some factors, such as the concentration of monomers, initiator and emulsifier are discussed. The polymerization rate equations of above two monomers can be written as follows: R(p) = k[M](1.21)[I](0.82)[E](0.57) (for QACEMA) R(p) = k'[M](1.34)[I](0.90)[E](0.62) (for DADMAC)
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.
