聚电解质用量对模板微粒和微胶囊性能的影响

Influence of polyelectrolyte amount on property of template particles and microcapsules

以掺杂不同浓度聚苯乙烯磺酸钠（PSS）的碳酸钙（CaCO3）微粒为模板,将聚丙烯胺盐酸盐（PAH）和PSS在模板表面进行层层组装,研究PSS掺杂量对模板微粒形貌尺寸及微胶囊负载性能的调控作用.通过扫描电镜与透射电镜观察其表观形貌和中空结构,利用热失重分析和紫外分光光度法对微胶囊的性质进行表征.结果表明,掺杂PSS的碳酸钙微粒为规则球体,较高的PSS浓度可获得粒径较小的CaCO3微粒,CaCO3微粒中含有PSS量为2.73％～5.12％,微胶囊内截留的PSS含量对其形貌和结构没有影响,冷冻干燥的微胶囊较热风干燥效果更好,所得的微胶囊对带正电荷的罗丹明B具有自沉积效应,最大负载效率可达75.42％.

Poly（styrene sulfonate） （PSS） doped calcium carbonate （CaCO3） particles were employed as a template, and poly （allylamine hydrochloride） （PAH） and PSS were alternately deposited on the template via layer-by-layer （LbL） assembly. The influence of PSS content on the template size and morphology and the loading efficiency of microcapsules were investigated. SEM and TEM were used to observe the morphology and hollow structure of microcapsules; and thermal gravimetric analysis （TGA） and UV-vis spectrophotometer were used to characterize the nature of microcapsules. The results showed that the PSS-doped CaCO3particles are all spherical and the higher concentration of PSS leads to smaller CaCO3 particles size, the PSS amount in CaCO3 particles is 2.73% ~ 5.12% , PSS trapped inside the microcapsules has no effect on its morphology and structure, vacuum drying is better than hot air drying, the resulting microcapsules have a deposition effect for rhodamine B, and the maximum loading efficiency is up to 75.42%.