Nasimova Irina Rashitovna, Rudyak Vladimir Yurievich, Doroganov Anton Pavlovich, Kharitonova Elena Petrovna, Kozhunova Elena Yurievna
Faculty of Physics, Lomonosov Moscow State University, 119991 Moscow, Russia.
Russian Academy of Science, 119991 Moscow, Russia.
Polymers (Basel). 2021 Mar 29;13(7):1078. doi: 10.3390/polym13071078.
This study investigates the formation of microstructured macromaterials from thermo- and pH-sensitive microgels based on interpenetrating networks of poly-N-isopropylacrylamide (PNIPAM) and polyacrylic acid (PAA). Macromaterials are produced as a result of the deposition of microgel particles and subsequent crosslinking of polyacrylic acid subnetworks to each other due to the formation of the anhydride bonds during annealing. Since both PNIPAM and PAA are environment-sensitive polymers, one can expect that their conformational state during material development will affect its resulting properties. Thus, the influence of conditions of preparation for annealing (pH of the solution, the temperature of preliminary drying) on the swelling behavior, pH- and thermosensitivity, and macromaterial inner structure was investigated. In parallel, the study of the effect of the relative conformations of the IPN microgel subnetworks on the formation of macromaterials was carried out by the computer simulations method. It was shown that the properties of the prepared macromaterials strongly depend both on the temperature and pH of the PNIPAM-PAA IPN microgel dispersions. This opens up new opportunities to obtain materials with pre-chosen characteristics and environmental sensitivity.
本研究基于聚N-异丙基丙烯酰胺（PNIPAM）和聚丙烯酸（PAA）的互穿网络，研究了由热敏和pH敏感微凝胶形成微结构大分子材料的过程。大分子材料是由于微凝胶颗粒的沉积以及随后在退火过程中由于酸酐键的形成而使聚丙烯酸子网络彼此交联而产生的。由于PNIPAM和PAA都是环境敏感型聚合物，可以预期它们在材料制备过程中的构象状态会影响其最终性能。因此，研究了退火制备条件（溶液的pH值、预干燥温度）对溶胀行为、pH和热敏性以及大分子材料内部结构的影响。同时，通过计算机模拟方法研究了IPN微凝胶子网络的相对构象对大分子材料形成的影响。结果表明，所制备的大分子材料的性能强烈依赖于PNIPAM-PAA IPN微凝胶分散体的温度和pH值。这为获得具有预先选定特性和环境敏感性的材料开辟了新的机会。
