通过“Graft from”方法对金属有机框架进行聚合物接枝构建疏水性质的MOF@polymer复合纳米粒子  

POLYMER GRAFTING OF METAL-ORGANIC FRAMEWORKS BY“Graft from”METHOD TO PREPARE MOF@POLYMER HYBRID NANOPARTICLES WITH HYDROPHOBIC PROPERTIES

作　　者：曹香慧 张珍坤[2] 李建垚 郑春熊 叶子涵 吴松海[1] CAO Xianghui;ZHANG Zhenkun;LI Jianyao;ZHENG Chunxiong;YE Zihan;WU Songhai(College of Chemical Engineering,Tianjin University,Tianjin 300350,China;Key Laboratory of Functional Polymer Materials of Ministry of Education,Institute of Polymer Chemistry,College of Chemistry,Nankai University,Tianjin 300071,China)

机构地区：[1]天津大学化工学院,天津300350 [2]南开大学化学学院高分子化学研究所,功能高分子教育部重点实验室天津300071

出　　处：《离子交换与吸附》2020年第5期394-403,共10页Ion Exchange and Adsorption

基　　金：国家自然科学金面上项目(No.21774064)。

摘　　要：金属有机框架(MOF)材料在气体吸附分离与存储、催化、药物投递、吸附降解有机污染物和吸附重金属离子等方面表现出优异的应用潜能,成为近几年广受关注的功能材料。但是MOF材料存在化学稳定性特别是水解稳定性差的缺点,常规方法合成的MOF材料多为多晶粉末形态,机械力学稳定性差且难以加工成型和器件化,这极大地限制了MOF材料的实际应用。为了解决这些不足并推进MOF材料的工业应用,将MOF材料与高分子材料复合成为近几年的研究热点。本工作通过一种简单通用的高分子接枝方法,对MOF多晶纳米颗粒进行高分子接枝以构建MOF@polymer复合纳米粒子。以带有氨基的UiO-66-NH_(2)纳米颗粒为模板,通过简单的化学改性在MOF表面引入双键作为高分子接枝的反应位点。在单体如苯乙烯和常规引发剂存在下,通过自由基聚合反应,成功在MOF表面接枝修饰上了聚苯乙烯高分子链。对所得高分子接枝的MOF材料采用XRD、SEM、TEM、接触角测量等测试方法进行详细表征。当所接枝的高分子链为疏水性聚合物如聚苯乙烯时,我们还进一步探讨了这类MOF@聚合物的疏水性以及在吸附分离有机污染物方面的应用。Due to vast potential applications in such diverse fields as purification and storage of gases,catalysis,drug delivery and removing organic pollutants,etc,metal-organic frameworks(MOFs)have become one of the most popular functional materials in recent years.However,practical applications of MOFs still face huge challenges due to some of their intrinsic shortcomings.For instance,most of MOFs are sensitive to humility and have poor hydrolytic stability.In addition,MOFs are often in the state of powders,together with their weak mechanical strength,it is difficult to process MOFs into applicable material formats.To address these challenges,combining MOFs with polymers to create MOF/polymer composites has attracted broad interest.In this work,we reported a simple,versatile polymer grafting method of MOF nanoparticles.Double bonds were introduced onto the surface of UiO-66-NH_(2) nanoparticles and acted as anchors for polymerization.In the presence of common initiator and monomers such as AIBN and styrene,polystyrene was successfully grafted onto the MOF surface via conventional free radical polymerization.Several techniques such as XRD,SEM,TEM and water contact angle measurement were used to fully characterize the polymer grafted MOFs.The hydrophobic PS entail the PS grafted PS with high hydrophobicity that can enhance hydrolytical stability.Furthermore,the PS grafted MOFs exhibited excellent adsorption capacity of organic compounds such as toluene.Such property made the PS grafted Ui O-66-NH2 a promising candidate for removing organic pollutant from aqueous environment.

关 键 词：有机金属框架 高分子接枝 疏水性 有机污染物 

分 类 号：O64[理学—物理化学]