衣康酸型可聚合乳化剂的合成及在细乳液聚合法制备聚苯乙烯/氯菊酯纳米胶囊中的应用

Synthesis of an Itaconic Polymerizable Emulsifier and Its Application in Nanoencapsulation of Polystyrene/Permethrin via Miniemulsion Polymerization

合成了可聚合乳化剂衣康酸单十二酯丙基磺酸钠,并将其应用于细乳液聚合法制备聚苯乙烯/氯菊酯纳米胶囊。考察了引发剂类型、乳化剂用量、交联剂和助稳定剂对聚苯乙烯/氯菊酯纳米胶囊粒径、包覆率的影响。采用红外光谱、核磁共振、质谱和透射电镜等表征手段对衣康酸单十二酯丙基磺酸钠的结构和聚苯乙烯/氯菊酯纳米胶囊的形貌进行了研究。研究结果表明:当衣康酸单十二酯丙基磺酸钠的用量占油相质量1.33%时,所制得的纳米胶囊粒径分布均匀,大小在500 nm左右;相比水溶性引发剂,油溶性引发剂引发聚合制得的纳米胶囊具有较大的包覆量;交联剂和助稳定剂的加入有助于对氯菊酯的包覆。

Sodium sulfopropyl-lauryl-itaconate （a polymerizable emulsifier） was synthesized and used as a surfactant in the preparation of polystyrene /permethrin nanocapsules via miniemulsion polymerization. Effects of initiators, emulsifier contents, cross-linking agents and co-stabilizers on the morphology and encapsulation efficiency of the nanocapsules were investigated. Transmission electron microscope （TEM）, Fourier transform infrared spectroscopic （FT-IR）, mass spectrometry （MS）, hydrogen nuclear magnetic resonance spectrum （1H-NMR） analysis were used to characterize the structure and properties of the nanocapsules. The results show that when the mass fraction of the emulsifier in oil phase is 1.33%, the obtained nanocapsules are highly uniform with an average diameter of 500 nm. Compared with water-soluble initiators, the use of an oil-soluble initiator can facilitate the encapsulation of permethrin. The addition of cross-linking agents and co-stabilizers are also helpful to encapsulate permethrin.