Nonideality in Silicone Network Formation via Solvent Swelling and 1H Double-Quantum NMR
Nonideality in Silicone Network Formation via Solvent Swelling and 1H Double-Quantum NMR
复制标题
通过溶剂溶胀和 1H 双量子 NMR 形成有机硅网络的非理想性
作者：
A. Sawvel;S. Chinn;Matthew Gee;C. Loeb;A. Maiti;H. Mason;R. Maxwell;J. Lewicki
聚二甲基硅氧烷（PDMS）基材料的多功能交联化学提供了广阔的研究空间，可以合成具有广泛变化的弹性体性能的聚合物。链长、交联密度、交联官能度、填料含量和链化学等参数都可以修改，以生产具有特定物理和机械性能的材料。商业化的基于聚硅氧烷的“有机硅”弹性体通常很棘手，这使得其网络的精确表征成为问题。我们在此报告应用平衡溶剂吸收分析和 1H 双量子核磁共振 (1H DQ NMR) 光谱来确定具有非理想网络拓扑的末端连接的 PDMS 网络的网络拓扑。尽管结构复杂，我们可以使用 1H DQ NMR 量化经典和非经典对网络结构的贡献，这与溶剂吸收数据相当一致。这些发现作为...
The versatile cross-linking chemistry of poly(dimethylsiloxane) (PDMS)-based materials affords a large research space in which polymers with widely varying elastomeric properties may be synthesized. Parameters such as chain length, cross-link density, cross-link functionality, filler content, and chain chemistry can all be modified to produce materials with specific physical and mechanical properties. Commercial polysiloxane-based, “silicone” elastomers are generally intractable, which makes the precise characterization of their networks problematic. We report here the application of equilibrium solvent uptake analysis and 1H double-quantum nuclear magnetic resonance (1H DQ NMR) spectroscopy to determine the network topology of end-linked PDMS networks with nonideal network topology. Despite their structural complexity, we can quantify both the classical and nonclassical contributions to network structure using 1H DQ NMR which are in reasonable agreement with solvent uptake data. These findings serve as t...