P(St-co-AA)聚合物模板法制备中空SiO_2微球研究
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摘要
以无皂乳液聚合法制备的苯乙烯(St)和丙烯酸(AA)阴离子型无规共聚物[P(St-co-AA)]微球为模板,不经过分离和离心、表面改性等任何后处理过程,采用溶胶-凝胶方法直接进行二氧化硅(SiO_2)包覆,成功制得中空SiO_2微球。探究了氨水用量、正硅酸乙酯(TEOS)用量以及不同AA用量对中空SiO_2微球的影响,并对制得的SiO_2微球进行了表征。研究结果表明,制得的中空SiO_2微球分散性优异,体系中无SiO_2实心小粒子,粒径均一,表面形貌呈树莓状,微球壁厚可控制在5～30nm范围内。
Anionic random copolymer microspheres [P(St-co-AA)]were synthesized by soap-free emulsion polymerization of styrene(St)and acrylic acid(AA).Then,hollow SiO_2 microspheres were fabricated by a sol-gel method using the anionic polymer microspheres as templates,in which the templates were not treated by any posttreatment processes,such as separation,centrifugation and surface modification.The effects of ammonia dosage,tetraethyl silicate(TEOS)dosage,the different amount of acrylic acid(AA)on microspheres were investigated,and the prepared microspheres were characterized.The results showed that the microspheres had excellent dispersibility,and there were no solid SiO_2 particles in the system.The microsphere size was uniform,the surface morphology was raspberry,and the wall thickness of microspheres can be controlled within the range of 5～30 nm.
Anionic random copolymer microspheres [P(St-co-AA)]were synthesized by soap-free emulsion polymerization of styrene(St)and acrylic acid(AA).Then,hollow SiO_2 microspheres were fabricated by a sol-gel method using the anionic polymer microspheres as templates,in which the templates were not treated by any posttreatment processes,such as separation,centrifugation and surface modification.The effects of ammonia dosage,tetraethyl silicate(TEOS)dosage,the different amount of acrylic acid(AA)on microspheres were investigated,and the prepared microspheres were characterized.The results showed that the microspheres had excellent dispersibility,and there were no solid SiO_2 particles in the system.The microsphere size was uniform,the surface morphology was raspberry,and the wall thickness of microspheres can be controlled within the range of 5～30 nm.
引文
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[2]罗花娟,赵彦保.中空SiO2纳米微球的制备与表征[J].化学研究,2010,21(6):49-52.
[3]顾瑶,牛奎,柯磊,等.P(St-EA-MAA)模板法制备中空二氧化硅微球[J].功能材料,2012(5):669-672.
[4]Cornelissen J J,Connor E F,Kim H C,et al.Versatile synthesis of nanometer sized hollow silica spheres[J].Chemical Communications,2003,9(8):1010-1011.
[5]Deng Ziwei,Chen Min,Zhou Shuxue,et al.A novel method for the fabrication of monodisperse hollow silica spheres[J].Langmuir the Acs Journal of Surfaces&Colloids,2006,18(6):801-806.
[6]魏英美.聚苯乙烯微球为模板制备中空微球的研究[D].济南:济南大学,2009.
[7]段国伟,谢李昭,赵弛,等.聚合物模板微球表面电性对中空二氧化硅微球形貌的影响[J].高分子学报,2017(5):785-792.
[8]甘治平,官建国,王振杰.聚合条件对P(St-co-AA)乳胶粒子结构的影响[J].纳米材料与结构,2005,42(7):318-321.