以氯甲基化交联聚苯乙烯树脂(CMCPS)为载体和大分子引发剂,溴化亚铜/2,2'-联吡啶为催化剂体系,采用了表面引发原子转移自由基聚合技术(SI-ATRP),将丙烯酰胺接枝到CMCPS树脂表面,制得了新型聚丙烯酰胺树脂(PAM-CMCPS),并且用元素分...以氯甲基化交联聚苯乙烯树脂(CMCPS)为载体和大分子引发剂,溴化亚铜/2,2'-联吡啶为催化剂体系,采用了表面引发原子转移自由基聚合技术(SI-ATRP),将丙烯酰胺接枝到CMCPS树脂表面,制得了新型聚丙烯酰胺树脂(PAM-CMCPS),并且用元素分析、扫描电镜和红外光谱对其进行了表征。考察了此树脂对2,4-二氯苯氧乙酸的吸附性能、动力学和热力学参数。结果表明,此树脂对2,4-二氯苯氧乙酸的吸附量随溶液初始浓度和温度的升高而增加,当初始浓度为8 mmol/L时吸附效果最佳,树脂的静态饱和吸附容量为111.0 mg/g,Langmuir和Freundlich方程都呈现良好的拟合度。热力学平衡方程计算得ΔG<0,ΔH=268.2 k J/mol,ΔS>0,表明此吸附过程是一个自发、吸热、熵增加的过程。动力学研究表明,准二级动力学方程能较好拟合动力学实验结果,该过程符合准二级动力学模型。此PAM-CMCPS树脂应用于柑橘样品中2,4-二氯苯氧乙酸的吸附,取得了较满意的结果。展开更多
Poly（glycidylmethacrylate） （PGMA） brushes were grafted from chloromethylated polysulfone （CMPSF） mem- brane surface by surface-initiated atom transfer radical polymerization （S1-ATRP）, and the grafting was fol...Poly（glycidylmethacrylate） （PGMA） brushes were grafted from chloromethylated polysulfone （CMPSF） mem- brane surface by surface-initiated atom transfer radical polymerization （S1-ATRP）, and the grafting was followed by hydrolysis of epoxy groups in the grafting chains to improve the membrane＇s hydrophilie property. Fourier trans- form infrared spectroscopy （FT-IR） and X-ray photoelectron spectroscopy （XPS） measurements confirmed the suc- cessful grafting and hydrolysis of PGMA. The grafting degree of the monomer, measured by periodic acid titration and gravimetric analysis, increased linearly with the polymerization time, while the static water contact angle of the membrane grafted with PGMA or hydrolyzed PGMA linearly decreased. In comparison with the PGMA-grafted membranes, the hydrolyzed PGMA-grafted membranes possess stronger hydrophilicity as indicated by their contact angle and hydration capacity, and as a result they have an improved antifouling property. Therefore, the control of the hydrophilicity of PSF membrane could be realized through adjusting the polymerization time and transforming the functional groups in the grafting chain.展开更多
A one-step procedure to hydrophilize monodisperse poly（chloromethyl-styrene-co-divinylbenzene） beads has been presented with 2-hydroxy-3-[4-（hydroxymethyl）-1H-1,2,3-triazol-1-yl]propy1 2-methylacrylate（HTMA） as ...A one-step procedure to hydrophilize monodisperse poly（chloromethyl-styrene-co-divinylbenzene） beads has been presented with 2-hydroxy-3-[4-（hydroxymethyl）-1H-1,2,3-triazol-1-yl]propy1 2-methylacrylate（HTMA） as monomer by surface-initiated atom transfer radical polymerization（SI-ATRP）.The length of the grafted poly（HTMA） chain was varied via controlling the ratio of HTMA to initiator on the surface of the beads.Using these grafted beads as the stationary phase in hydrophilic interaction chromatography,good separation was obtained for nucleosides in the mobile phase of acetonitrile-water.It was also found that the retention time and selectivity of solutes showed a positive relationship with the length of the grafted poly（HTMA） chain.展开更多
文摘以氯甲基化交联聚苯乙烯树脂(CMCPS)为载体和大分子引发剂,溴化亚铜/2,2'-联吡啶为催化剂体系,采用了表面引发原子转移自由基聚合技术(SI-ATRP),将丙烯酰胺接枝到CMCPS树脂表面,制得了新型聚丙烯酰胺树脂(PAM-CMCPS),并且用元素分析、扫描电镜和红外光谱对其进行了表征。考察了此树脂对2,4-二氯苯氧乙酸的吸附性能、动力学和热力学参数。结果表明,此树脂对2,4-二氯苯氧乙酸的吸附量随溶液初始浓度和温度的升高而增加,当初始浓度为8 mmol/L时吸附效果最佳,树脂的静态饱和吸附容量为111.0 mg/g,Langmuir和Freundlich方程都呈现良好的拟合度。热力学平衡方程计算得ΔG<0,ΔH=268.2 k J/mol,ΔS>0,表明此吸附过程是一个自发、吸热、熵增加的过程。动力学研究表明,准二级动力学方程能较好拟合动力学实验结果,该过程符合准二级动力学模型。此PAM-CMCPS树脂应用于柑橘样品中2,4-二氯苯氧乙酸的吸附,取得了较满意的结果。
基金This work was supported by the National Natural Science Foundation of China （No. 20975080） and the key project of Chinese Ministry of Education （No. 212178）.
文摘Poly（glycidylmethacrylate） （PGMA） brushes were grafted from chloromethylated polysulfone （CMPSF） mem- brane surface by surface-initiated atom transfer radical polymerization （S1-ATRP）, and the grafting was followed by hydrolysis of epoxy groups in the grafting chains to improve the membrane＇s hydrophilie property. Fourier trans- form infrared spectroscopy （FT-IR） and X-ray photoelectron spectroscopy （XPS） measurements confirmed the suc- cessful grafting and hydrolysis of PGMA. The grafting degree of the monomer, measured by periodic acid titration and gravimetric analysis, increased linearly with the polymerization time, while the static water contact angle of the membrane grafted with PGMA or hydrolyzed PGMA linearly decreased. In comparison with the PGMA-grafted membranes, the hydrolyzed PGMA-grafted membranes possess stronger hydrophilicity as indicated by their contact angle and hydration capacity, and as a result they have an improved antifouling property. Therefore, the control of the hydrophilicity of PSF membrane could be realized through adjusting the polymerization time and transforming the functional groups in the grafting chain.
基金supported by National Natural Science Foundation of China(No.20975080)Program for New Century Excellent Talents in University(No.NCET-08-0892)+1 种基金Major State Basic Research Development Program of China(No.2009CB26608)Natural Science Foundation of Ningxia Province(No.NZ0914)
文摘A one-step procedure to hydrophilize monodisperse poly（chloromethyl-styrene-co-divinylbenzene） beads has been presented with 2-hydroxy-3-[4-（hydroxymethyl）-1H-1,2,3-triazol-1-yl]propy1 2-methylacrylate（HTMA） as monomer by surface-initiated atom transfer radical polymerization（SI-ATRP）.The length of the grafted poly（HTMA） chain was varied via controlling the ratio of HTMA to initiator on the surface of the beads.Using these grafted beads as the stationary phase in hydrophilic interaction chromatography,good separation was obtained for nucleosides in the mobile phase of acetonitrile-water.It was also found that the retention time and selectivity of solutes showed a positive relationship with the length of the grafted poly（HTMA） chain.
