Organic–Inorganic Polyureas with POSS Cages in the Main Chains via Polycondensation of Diamines with Carbon Dioxide
Organic–Inorganic Polyureas with POSS Cages in the Main Chains via Polycondensation of Diamines with Carbon Dioxide
复制标题
DOI：
10.1021/acsapm.1c01399
复制
发表时间：
2021-12
影响因子：
5
通讯作者：
Bingjie Zhao;Honggang Mei;Huaming Wang;Lei Li;Sixun Zheng
中科院分区：
文献类型：
--
作者：
Bingjie Zhao;Honggang Mei;Huaming Wang;Lei Li;Sixun Zheng
通过二氧化碳与二胺的缩聚反应，合成了主链含笼型倍半硅氧烷（POSS）的线型有机-无机聚脲（Pureas）。首先，合成了3，13-二苯胺基双德克尔倍半硅氧烷（表示为3，13-二苯胺基DDSQ）。一种α，ω-二氨基封端的聚利用POSS二胺和环氧丙烷进行CO2缩聚反应，得到了不同POSS含量的PUrea和PUrea-DDSQ，其分子量较高。POSS笼聚集成直径为50-120 nm的球形微区。由于POSS笼的引入，Purea从粘性液体转化为弹性固体的组成范围内调查。在室温下，线性有机-无机聚氨酯表现为交联弹性体。这一行为归因于POSS微区作为交联位点的物理交联的产生。此外，有机-无机Pureas通过多个氢键的动态交换显示出自修复性能。结果表明，3，13-二苯胺基DDSQ的含量对材料的自修复性能有显著影响。
Linear organic–inorganic polyureas (PUreas) with polyhedral oligomeric silsesquioxane (POSS) cages in the main chains were synthesized via polycondensation of diamines with carbon dioxide (CO2). First, 3,13-dianilino double decker silsesquioxane (denoted 3,13-dianilino DDSQ) was synthesized. An α,ω-diamino-terminated poly(propylene oxide) as well as the POSS diamine was exploited for polycondensation with CO2; PUrea and PUrea-DDSQ with sufficiently high molecular weights were obtained with various contents of POSS. The morphological investigation shows that the linear PUreas with POSS cages in the main chains were microphase-separated; the POSS cages were aggregated into spherical microdomains with the size of 50–120 nm in diameter. Owing to the introduction of POSS cages, PUrea was transformed from a viscous liquid into elastic solids in the ranges of composition investigated. At room temperature, linear organic–inorganic PUreas behaved as cross-linked elastomers. This behavior is ascribed to the generation of physical cross-linking with POSS microdomains as the cross-linking sites. In addition, the organic–inorganic PUreas displayed self-healing properties via the dynamic exchange of multiple hydrogen bonds. It was found that the self-healing properties were significantly affected by the content of 3,13-dianilino DDSQ.