Crosslinked polymers based on polyborosiloxanes: Synthesis and properties
Crosslinked polymers based on polyborosiloxanes: Synthesis and properties
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DOI：
10.1016/j.jorganchem.2019.04.016
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发表时间：
2019-08-01
影响因子：
2.3
通讯作者：
Muzafarov, Aziz M.
中科院分区：
文献类型：
--
作者：
Drozdov, Fedor V.;Milenin, Sergey A.;Muzafarov, Aziz M.
在目前的工作中，交联聚硼硅氧烷（PBS）的合成基于聚二甲基硅氧烷（PDMS）的聚合物链中的末端二甲基氢硅烷基或分布的甲基氢硅烷基和硼酸或苯基硼酸甲酯的Piers-Rubinsztajn反应。取决于初始PDMS中甲基氢化甲硅烷基的数量和位置，以及硼酸组分的官能度（对于苯基硼酸为2，对于硼酸甲酯为3），获得具有不同大分子结构和交联密度的PBS。与硼酸三甲酯交联的基于具有末端二甲基氢化甲硅烷基的PDMS的PBS可溶于常见溶剂如THF、甲苯和氯仿中，而基于具有分布的甲基氢化甲硅烷基的PDMS的PBS不溶。在环境室中的研究表明，PBS样品在实验条件下的水解稳定性，这是通过凝胶渗透色谱法（GPC）和红外光谱法（FTIR）证实。在所获得的PBS的热稳定性的研究中，在380-430 ℃下观察到5%的重量损失。差示扫描量热法（DSC）实验表明，不同的硼交联的PBS的相行为的差异。(C)2019爱思唯尔B. V.保留所有权利。
In current work, crosslinked polyborosiloxanes (PBS) were synthesized by the Piers-Rubinsztajn reaction based on polydimethylsiloxanes (PDMS) with terminal dimethylhydrosilyl or distributed methylhydrosilyl groups in the polymer chain and boronic or phenyl boronic acid methyl esters. Depending on the number and location of the methylhydrosilyl groups in the initial PDMS, as well as on the functionality of the boronic component (2 for phenyl boronic and 3 for boronic acid methyl esters), PBS with different macromolecular architecture and crosslinking density were obtained. PBS based on PDMS with terminal dimethylhydrosilyl groups, crosslinked with trimethyl borate, are soluble in common solvents such as THF, toluene and chloroform, whereas PBS based on PDMS with distributed methylhydrosilyl groups are non-soluble. Investigations in an environmental chamber showed hydrolytic stability of the PBS samples under experimental conditions, which was confirmed by gel permeation chromatography (GPC) and infrared spectroscopy (FTIR). In the investigations of thermal stability of obtained PBS, 5% weight loss was observed at 380-430 degrees C. Differential scanning calorimetry (DSC) experiments showed differences in phase behavior of PBS with different boronic crosslinks. (C) 2019 Elsevier B.V. All rights reserved.