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在疏水高分子胶体模板——含氟丙烯酸酯(FA)共聚物乳胶粒中引入能够介导SiO2原位沉积的聚胺催化活性点-甲基丙烯酰氧乙基三甲基氯化铵(DMC),以四甲氧基硅烷(TMOS)为硅源,在环境条件下可控合成了核壳型FA共聚物/SiO2杂化纳米粒子.高温煅烧除去聚合物核质,可得到中空的SiO2纳米粒子,结合FTIR、EDX、TGA以及XPS等表征数据印证了SiO2的沉积主要发生在聚合物模板的表面.进一步考察了反应条件,如聚胺功能单体DMC的浓度、TMOS的浓度以及反应时间对SiO2杂化纳米粒子的形貌与组成的影响.实验结果表明增加DMC或者TMOS的浓度,适当延长反应时间,均可增加SiO2粒子的沉积速率,导致SiO2壳层的厚度增加,并且杂化粒子的形貌由凹陷多褶皱的核壳结构向可动芯结构转变.由于FA共聚物模板的强疏水性,增加有机核层和无机壳层间的不相容排斥,最终导致核壳层间空腔的形成,得到含可动芯的核壳型SiO2杂化粒子。
In the hydrophobic polymer colloidal template - fluorine-containing acrylate (FA) copolymer latex particles introduced into the in situ deposition of SiO2-mediated polyamine catalytic activity point - methacryloyloxyethyl trimethyl ammonium chloride (DMC ), Tetramethoxysilane (TMOS) as the silicon source, controlled synthesis of core-shell FA copolymer / SiO2 hybrid nanoparticles under ambient conditions.High-temperature calcination to remove the polymer nuclei can be obtained hollow SiO2 nano The results show that the deposition of SiO_2 mainly occurs on the surface of the polymer template, and the reaction conditions such as the concentration of DMC, the concentration of TMOS SiO2 hybrid nanoparticles.The experimental results show that increasing the concentration of DMC or TMOS and prolonging the reaction time can increase the deposition rate of SiO2 particles and increase the thickness of the SiO2 shell, Morphology from the hollow polyhedron core-shell structure to the movable core structure changes due to the strong hydrophobic hydrophobic copolymer template, increase the organic core layer and the inorganic shell between the exclusion of incompatibility, eventually leading to the gap between the nuclear shell Cavity formation, get included SiO2 core-shell type hybrid movable core particles.