Towards Porous Silicon Oxycarbide Materials: Effects of Solvents on Microstructural Features of Poly(methylhydrosiloxane)/Divynilbenzene Aerogels
Towards Porous Silicon Oxycarbide Materials: Effects of Solvents on Microstructural Features of Poly(methylhydrosiloxane)/Divynilbenzene Aerogels
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DOI：
10.3390/ma11122589
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发表时间：
2018-12-01
期刊：
影响因子：
3.4
通讯作者：
Soraru, Gian Domenico
中科院分区：
文献类型：
--
作者：
Aguirre-Medel, Susana;Jana, Prasanta;Soraru, Gian Domenico
研究了溶剂对聚甲基氢硅氧烷/二乙烯基苯(PMHS/DVB)气凝胶微观结构的影响。凝胶是在高度稀释的条件下，通过含Si-H基团的PMHS的硅氢化反应，并与DVB的C=C基团交联制得。聚合物气凝胶是在与液态二氧化碳交换溶剂和随后的超临界干燥后得到的。用显微镜和孔隙度测量法对样品进行了表征。常见的孔隙形成概念并不能为观察到的数据提供坚实的理论基础。我们推测，这些PMHS/DVB聚合物气凝胶在不同溶剂中的溶解性和溶胀性是影响其成孔的主要因素。
We investigate the impact of solvents on the microstructure of poly(methylhydrosiloxane)/divinylbenzene (PMHS/DVB) aerogels. The gels are obtained in highly diluted conditions via hydrosilylation reaction of PMHS bearing Si-H groups and cross-linking it with C=C groups of DVB. Polymer aerogels are obtained after solvent exchange with liquid CO2 and subsequent supercritical drying. Samples are characterized using microscopy and porosimetry. Common pore-formation concepts do not provide a solid rationale for the observed data. We postulate that solubility and swelling of the cross-linked polymer in various solvents are major factors governing pore formation of these PMHS/DVB polymer aerogels.