Obrezkova Marina A, Nesterkina Alina A, Muzafarov Aziz M
Enikolopov Institute of Synthetic Polymeric Materials, Russian Academy of Sciences (ISPM RAS), Profsoyuznaya Str. 70, Moscow 117393, Russia.
Nesmeyanov Institute of Organoelement Compounds (NIOC RAS), Vavilova Str. 28, str. 1, Moscow 119334, Russia.
Polymers (Basel). 2025 Jul 24;17(15):2023. doi: 10.3390/polym17152023.
Polysodiumoxy(methyl)siloxane is a highly functional polymer matrix that can be used for the preparation of both functional and non-functional polymers, including molecular brushes. To determine the molecular weight parameters of the matrix, as well as its chemical structure, it is necessary to develop an effective method of blocking functional (in our case, sodiumoxy) groups due to their high reactivity. At the same time, the blocking product should represent a complete non-functionalized replica of polysodiumoxy(methyl)siloxane. Since the obtained polysodiumoxy(methyl)siloxane can contain both sodium- and hydroxy groups in its composition, the presence of both types of functional groups should be considered in the blocking process. In this work, we investigated the blocking process of polysodiumoxy(methyl)siloxane and the influence of blocking conditions on the blocked product. We carried out several variants of blocking, which differed in the order and method of introduction of reagents, as well as in the temperature regime. The chemical structure and molecular weight characteristics of the obtained polymers were analyzed by H NMR spectroscopy and gel permeation chromatography (GPC), respectively. According to the blocking results, only in one case, complete non-functionalized replicas of polysodiumoxy(methyl)siloxane were obtained, which allows this technique to be used as a tool for the analysis of complex, highly functionalized organosilicon systems.
聚（甲基）硅氧烷氧基钠是一种高功能性聚合物基体，可用于制备功能性和非功能性聚合物，包括分子刷。为了确定该基体的分子量参数及其化学结构，由于其高反应活性，有必要开发一种有效的方法来封闭功能性（在我们的例子中是氧基钠）基团。同时，封闭产物应代表聚（甲基）硅氧烷氧基钠的完全非功能化复制品。由于所获得的聚（甲基）硅氧烷氧基钠在其组成中可能同时含有钠基和羟基，在封闭过程中应考虑这两种官能团的存在。在这项工作中，我们研究了聚（甲基）硅氧烷氧基钠的封闭过程以及封闭条件对封闭产物的影响。我们进行了几种不同的封闭变体，它们在试剂引入的顺序和方法以及温度条件方面有所不同。分别通过核磁共振氢谱（H NMR）和凝胶渗透色谱（GPC）对所得聚合物的化学结构和分子量特征进行了分析。根据封闭结果，仅在一种情况下获得了聚（甲基）硅氧烷氧基钠的完全非功能化复制品，这使得该技术可作为分析复杂的、高度功能化有机硅体系的一种工具。
