低温等离子体液相接枝NVP改性PAN膜

采用液相等离子体接枝技术改性聚丙烯腈(PAN)膜,在PAN膜表面引入亲水性单体氮乙烯吡咯烷酮(NVP).通过傅立叶红外光谱、DSC、XPS对PAN改性膜进行了表征,研究了单体浓度、温度、接枝时间对PAN改性膜纯水通量的影响,考察了在不同单体接枝温度下,PAN改性膜对NaCl、MgSO4混合盐体系的分离性能.

The graft modification of poly acrylonitrile (PAN) membranes in NVP aqueous solution by low- temperature plasma

In order to control surface performances of polyacrylonitrile(PAN) membrane,low temperature plasma-induced graft modifications was used to prepare hydrophilic membranes.By argon(Ar) treating and subsequent grafting reaction,a hydrophilic monomer,NVP,was introduced onto PAN membrane.The effectiveness of modification and the chemical changes at the modified surface was studied under different plasma operating variables and graft reaction conditions such as plasma power,treatment time,monomer temperature and reaction time.The structure and chemical composition at the PAN membrane surface were characterized by reflection FTIR,X-ray photoelectron spectroscopy(XPS),and DSC.It was revealed that NVP monomers were successfully grafted onto PAN membranes.The water permeabilities of the PAN membranes modified in different graft condition,such as reaction time,reaction temperature were measured.The flux and retention of the modified PAN membranes were determined with a mixed salt(0.03 mol/L MgSO_4 0.02 mol/L NaCl)/water system.