Melting Gel Films for Low Temperature Seals
作者： Mihaela Jitianu , Andrei Jitianu , Michael Stamper , Doreen Aboagye , Lisa C. Klein
DOI: 10.1557/OPL.2013.506
关键词: Differential scanning calorimetry 、 Sol-gel 、 Rheometry 、 Glass transition 、 Dimethyldiethoxysilane 、 Viscoelasticity 、 Composite material 、 Siloxane 、 Elastic modulus 、 Chemical engineering 、 Materials science
摘要: Melting gels are silica-based hybrid with the curious behavior that they rigid at room temperature, but soften around 110°C. A typical melting gel is prepared by mixing methyltriethoxysilane (MTES) and dimethyldiethoxysilane (DMDES). MTES has one methyl group substituted for an ethoxy, DMDES two substitutions. The groups do not hydrolyze, which limits network-forming capability of precursors. To gain insight into molecular structure gels, differential scanning calorimetry oscillatory rheometry studies were performed on before consolidation. According to rheometry, behave as viscous fluids, a modulus, G″(t,ω0) larger than elastic G′(t,ω0). As temperature decreased, continue both moduli increasing decreasing temperature. At some point, cross over, this recorded glass transition Tg. Tg values obtained from methods in excellent agreement. decreases -0.3oC -56oC increase amount di-substituted siloxane (DMDES) 30 50 mole %. decrease follows number hydrolytically stable groups, meaning oxygen bridges between chains.
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