Dubrovskii Alexey V, Kim Aleksandr L, Tikhonenko Sergey A
Institute of Theoretical and Experimental Biophysics Russian Academy of Science, 3, Institutskaya Str., 142290 Puschino, Moscow Region, Russia.
Polymers (Basel). 2024 Aug 9;16(16):2261. doi: 10.3390/polym16162261.
One of the key physicochemical parameters of polyelectrolyte microcapsules (PMCs) is their buffer capacity (BC). The BC of the microcapsules allows for an assessment of the change in protonation state across the entire polyelectrolyte system, which directly impacts the buffer barrier of PMCs, as well as the stability and physical properties of their shell. However, the buffer capacity of PMCs and their behavior under changes in ionic strength and temperature can differ depending on the type of core used to form the microcapsules. As part of this study, we revealed the buffer capacity (BC) of polyelectrolyte microcapsules formed on polystyrene cores (PMC) and studied the influence of ionic strength and environmental temperature on the BC of these capsules. We found that the buffer capacity of PMC differs from the BC of water at a pH above 8; the addition of sodium chloride leads to an increase in buffer capacity in alkaline conditions, and conversely, thermal treatment leads to its decrease at a pH of 9. The results obtained are different from the BC of polyelectrolyte microcapsules formed on CaCO cores, which suggests a difference in the physicochemical properties of these types of capsules. The buffer capacity of polyelectrolyte microcapsules depends on the type of template used.
聚电解质微胶囊（PMCs）的关键物理化学参数之一是其缓冲容量（BC）。微胶囊的缓冲容量有助于评估整个聚电解质系统中质子化状态的变化，这直接影响PMCs的缓冲屏障及其外壳的稳定性和物理性质。然而，PMCs的缓冲容量及其在离子强度和温度变化下的行为可能因用于形成微胶囊的核的类型而异。作为本研究的一部分，我们揭示了在聚苯乙烯核上形成的聚电解质微胶囊（PMC）的缓冲容量（BC），并研究了离子强度和环境温度对这些胶囊缓冲容量的影响。我们发现，在pH高于8时，PMC的缓冲容量与水的缓冲容量不同；添加氯化钠会导致碱性条件下缓冲容量增加，相反，热处理会导致在pH为9时缓冲容量降低。所得结果与在碳酸钙核上形成的聚电解质微胶囊的缓冲容量不同，这表明这些类型胶囊的物理化学性质存在差异。聚电解质微胶囊的缓冲容量取决于所用模板的类型。
