A versatile dispersant plays a critical role in the suspension stability of pesticide suspension concentrate (SC) systems. Herein, a series of novel acrylate ester-based polycarboxylate terpolymers (PTs) were designed as dispersant for pesticide suspension concentrate and successfully synthesized in aqueous solutions from the copolymerization of α-methacrylic acid, allyl polyoxyethylene ether, and acrylate (methyl acrylate, ethyl acrylate, and n-butyl acrylate). Terpolymers were characterized by FT-IR and ¹H-NMR to confirm their structure. The surface activities of PTs were evaluated according to critical micelle concentration (CMC) and the surface tension at CMC (γ_CMC). PT-3 with the longest alkyl side-chain length displayed the most superior surface activity due to its lowest CMC value compared with that of the other PTs. Additionally, the dispersion properties of PTs as dispersants in a 600 g/L imidacloprid SC were evaluated. Results showed that compared to the other two PTs, PT-3 contributes to the excellent dispersion properties on imidacloprid SC. Meanwhile, the obtained SC system exhibited shear thinning behavior under high-speed shearing showing typical features of pseudo-plastic non-Newtonian fluids, which conforms to the Herschel–Buckley model. Our results revealed that the effect of the alkyl side-chain length of dispersants could be considered the primary modulator of dispersion performance of SCs.

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不同烷基侧链长度的聚羧酸酯三元共聚物在农药悬浮液中的分散性能

多功能分散剂在农药悬浮浓缩物 (SC) 系统的悬浮稳定性中起着至关重要的作用。在此，设计了一系列新型丙烯酸酯基聚羧酸酯三元共聚物（PTs）作为农药悬浮浓缩物的分散剂，并在水溶液中由α-甲基丙烯酸、烯丙基聚氧乙烯醚和丙烯酸酯（丙烯酸甲酯、丙烯酸乙酯）共聚成功合成。和丙烯酸正丁酯）。三元共聚物通过 FT-IR 和¹ H-NMR表征以确认其结构。根据临界胶束浓度（CMC）和在CMC中的表面张力的PT的表面活性进行了评价（γ _CMC）。与其他 PT 相比，具有最长烷基侧链长度的 PT-3 由于其最低的 CMC 值而显示出最优异的表面活性。此外，还评估了 PT 作为分散剂在 600 g/L 吡虫啉 SC 中的分散性能。结果表明，与其他两种 PT 相比，PT-3 有助于在吡虫啉 SC 上获得优异的分散性能。同时，获得的 SC 系统在高速剪切下表现出剪切稀化行为，显示出典型的假塑性非牛顿流体特征，符合 Herschel-Buckley 模型。我们的结果表明，分散剂的烷基侧链长度的影响可以被认为是 SC 分散性能的主要调节剂。