Thermoreversible physical gels of poly(dimethylsiloxane) without cross-links or functionalization.
Thermoreversible physical gels of poly(dimethylsiloxane) without cross-links or functionalization.
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DOI：
10.1021/la401521m
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发表时间：
2013-06
期刊：
影响因子：
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通讯作者：
E. Dahan;P. Sundararajan
中科院分区：
文献类型：
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作者：
E. Dahan;P. Sundararajan
迄今为止，文献报道的聚二甲基硅氧烷（PDMS）凝胶的制备涉及催化剂和化学交联（化学凝胶）或有机凝胶剂的官能化。我们报告说，可以用丙胺或己胺作为溶剂制备无交联或官能化的 PDMS 热可逆物理凝胶。凝胶由小至 20 nm 的球形区域组成。我们证明这些球形域是网络的一部分。差示扫描量热法（DSC）、光学显微镜和流变学表明该凝胶是热可逆的。通过 DSC 实验，我们设计了一种程序，可在第一次和第二次加热循环中实现热可逆性，并具有非常相似的凝胶-溶胶转变吸热。
The preparation of gels of poly(dimethylsiloxane) (PDMS) reported in the literature so far involves catalysts and chemical cross-links (chemical gels) or functionalization with organogelators. We report that thermoreversible physical gels of PDMS, without cross-links or functionalization, can be made with propylamine or hexylamine as a solvent. The gels consist of spherical domains as small as 20 nm. We show that these spherical domains are part of a network. Differential scanning calorimetry (DSC), optical microscopy, and rheology show that the gel is thermoreversible. With the DSC experiments, we have devised a procedure to achieve thermoreversibility with very similar gel-sol transition endotherms in the first and second heating cycles.