利用AAO制备纳米管及其表面ATRP接枝改性研究
摘要
阳极氧化铝(AAO)模板具有规整有序的纳米孔,使得它在纳米材料制备方面有着重要的应用,并引起了人们的广泛关注。本文开展了利用AAO模板制备聚合物纳米管的研究,并探索了表面接枝及活性自由基聚合方法对AAO模板改性上的应用。主要工作如下:
1)以多孔氧化铝膜(AAO)为模板,采用聚合物溶液法和熔融法,进行了一维聚合物纳米阵列的制备研究。制备了PEI及PAN纳米管阵列,通过改变聚合物浓度得到了不同壁厚的PEI纳米管。并对它们进行了碳化,探讨了聚合物性质对碳化后CNTs结构的影响。
2)采用了一种新的方法在AAO膜进行表面引发原子转移自由基聚合(ATRP)接枝功能化.即在AAO表面进行聚多巴胺沉积,之后利用聚多巴胺与溴引发剂反应,将ATRP引发剂固定在AAO表面。通过ATRP在AAO表面接枝甲基丙烯酸(AAc)及甲基丙烯酸甲酯(MMA)。将所得的功能膜进行X射线光电子能谱、傅立叶转变红外光谱(FTIR)、扫描电镜(SEM)分析,并研究了其反应动力学。分析表明该反应为可控的活性聚合,可以通过改变聚合浓度及反应时间来控制其反应。
Anodic aluminum oxide (AAO) have ordered arrays of uniform nanochannels, making it a important material in the preparation of one-dimensional nano-materials. In this work, we prepared polymer nanotubes using AAO as template, the surface functionalizaiton of AAO membrane by ATRP was also studies.
Porous alumina oxide membrane (AAO) as a template to prepare a variety of one-dimensional array of polymer nanotubes. The PEI and PAN nanotubes array has been prepared by this method, and the different wall thickness of nanotubes was prepared by changing the polymer concentration. The polymer nanotubes were further carbonized to carbon nanotubes.
A facile method for surface-initiated atom transfer radical polymerization (ATRP) on the anodic aluminum oxide (AAO) membranes has been developed. The AAO membrane was firstly functionalized by poly(dopamine), the bromoalkyl initiator was then immobilized on the poly(dopamine) functionalized AAO membrane surface in a two-step solid-phase reaction, followed by ATRP of acrylic acid (AAc) and Methyl methacrylate (MMA) in a aqueous solution. The polymer-grafted AAO membranes were characterized by X-ray photoelectron spectroscopy (XPS), fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM). The XPS and FTIR results indicated that PAAc was successfully grafted on the AAO membrane surface. The results indicate that the thickness of the grafted polymer inside the isocylindrical pores of AAO membranes could be well controlled by changing the reaction time and monomer concentration.
1)以多孔氧化铝膜(AAO)为模板,采用聚合物溶液法和熔融法,进行了一维聚合物纳米阵列的制备研究。制备了PEI及PAN纳米管阵列,通过改变聚合物浓度得到了不同壁厚的PEI纳米管。并对它们进行了碳化,探讨了聚合物性质对碳化后CNTs结构的影响。
2)采用了一种新的方法在AAO膜进行表面引发原子转移自由基聚合(ATRP)接枝功能化.即在AAO表面进行聚多巴胺沉积,之后利用聚多巴胺与溴引发剂反应,将ATRP引发剂固定在AAO表面。通过ATRP在AAO表面接枝甲基丙烯酸(AAc)及甲基丙烯酸甲酯(MMA)。将所得的功能膜进行X射线光电子能谱、傅立叶转变红外光谱(FTIR)、扫描电镜(SEM)分析,并研究了其反应动力学。分析表明该反应为可控的活性聚合,可以通过改变聚合浓度及反应时间来控制其反应。
Anodic aluminum oxide (AAO) have ordered arrays of uniform nanochannels, making it a important material in the preparation of one-dimensional nano-materials. In this work, we prepared polymer nanotubes using AAO as template, the surface functionalizaiton of AAO membrane by ATRP was also studies.
Porous alumina oxide membrane (AAO) as a template to prepare a variety of one-dimensional array of polymer nanotubes. The PEI and PAN nanotubes array has been prepared by this method, and the different wall thickness of nanotubes was prepared by changing the polymer concentration. The polymer nanotubes were further carbonized to carbon nanotubes.
A facile method for surface-initiated atom transfer radical polymerization (ATRP) on the anodic aluminum oxide (AAO) membranes has been developed. The AAO membrane was firstly functionalized by poly(dopamine), the bromoalkyl initiator was then immobilized on the poly(dopamine) functionalized AAO membrane surface in a two-step solid-phase reaction, followed by ATRP of acrylic acid (AAc) and Methyl methacrylate (MMA) in a aqueous solution. The polymer-grafted AAO membranes were characterized by X-ray photoelectron spectroscopy (XPS), fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM). The XPS and FTIR results indicated that PAAc was successfully grafted on the AAO membrane surface. The results indicate that the thickness of the grafted polymer inside the isocylindrical pores of AAO membranes could be well controlled by changing the reaction time and monomer concentration.
引文
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