摘要
以三聚氯氰为交联剂,通过傅克烷基化反应制备了具有三嗪交联结构的聚苯乙烯基多孔聚合物。采用线性聚苯乙烯和预交联聚苯乙烯球为原料,分别获得了具有三维网络结构与球形结构的超交联多孔聚合物。通过扫描电子显微镜、透射电子显微镜、红外光谱、氮气吸附-脱附测试等手段分析了超交联多孔聚苯乙烯的微观形貌、化学结构与孔结构。与羰基交联的聚苯乙烯相比,三嗪交联的聚苯乙烯的比表面积更大、介孔更丰富。对商用聚苯乙烯进行相似处理,也得到了具有类似三维网络结构的多孔聚苯乙烯。
Hypercrosslinked porous polymers(HCPs)possess advantages of high specific surface areas,adjustable functionalities,controllable pore structures and low cost.Therefore,they have widespread application prospect in many fields such as gas storage,adsorption/separation,drug release and catalysis.Development of crosslinked structure is of importance to construct novel HCPs with optimized porous structures and new properties in emerging fields.Herein,a series of triazinecrosslinked HCPs from polystyrene were fabricated through Friedel-Crafts hypercrosslinking reaction,in which cyanuric chloride was introduced as the crosslinking agent.Using linear polystyrene and polystyrene spheres as raw materials,HCPs with three-dimensional network nanostructure and spherical morphology were obtained,respectively.Field-emission scanning electron microscopy,transmission electron microscopy,Fourier transform infrared spectra,N2 adsorption-desorption tests were performed to investigate the microstructure,chemical structure,and pore structure.The results show that the triazine crosslinking structure provides much higher surface area and richer mesopores below 10 nm in the asobtained HCPs,compared with previously reported carbonyl crosslinking structures.The hypercrosslinking conditions of raw material concentration and crosslinking time were further investigated.The results show that lower polystyrene concentration gives rise to higher surface area in the resulting three-dimensional network HCPs because of developed mesopores;while an increase of hypercrosslinking time results in enhanced microporous surface area and the rising tendency levels off after 2 h.Furthermore,the proposed triazine crosslinking strategy can be implemented using commercial polystyrene,leading to similar triazine-crosslinked HCPs with three-dimensional network structure.Therefore,our finding opens up a new avenue for wasteto-wealth recycle of polystyrene,which is one source for causing so-called“white pollution”.
作者
邱玉倩
刘千惠
韩浩杰
于涛
王洪强
徐飞
QIU Yuqian;LIU Qianhui;HAN Haojie;YU Tao;WANG Hongqiang;XU Fei(Center for Nano Energy Materials,State Key Laboratory of Solidification Processing,School of Materials Science and Engineering,Northwestern Polytechnical University,Xi’an 710072,China;Institute of Flexible Electronics,Northwestern Polytechnical University,Xi’an 710129,China)
出处
《功能高分子学报》
CAS
CSCD
北大核心
2020年第6期554-562,共9页
Journal of Functional Polymers
