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Fabrication of Mechanically Strong Honeycombs with Aerogel Cores
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-01-19 00:00:00 , DOI: 10.1021/acs.iecr.7b04058 Lauren S. White , Tyler Selden , Massimo F. Bertino , Charles Cartin , Joseph Angello , Marina Schwan 1 , Barbara Milow 1 , Lorenz Ratke 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-01-19 00:00:00 , DOI: 10.1021/acs.iecr.7b04058 Lauren S. White , Tyler Selden , Massimo F. Bertino , Charles Cartin , Joseph Angello , Marina Schwan 1 , Barbara Milow 1 , Lorenz Ratke 1
Affiliation
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Honeycomb aerogel composites were fabricated by reinforcing selected regions of a native aerogel matrix using photopolymerization. First, alcogels were synthesized by hydrolysis–condensation of a siloxane, and by adding a multifunctional acrylic monomer and a visible-light initiator to the gelation solution. Alcogels were then placed on a programmable translation stage and exposed to a laser. Polymerization and mechanical reinforcement were induced in the exposed regions. After exposure alcogels were dried supercritically. Thermal conductivity and out-of-plane modulus of the resulting honeycombs could be varied between values typical of native aerogels (11 mW/mK and 0.75 MPa) and those of uniformly polymerized composites (65.8 mW/mK and 36.26 MPa) by varying the translation stage speed between 2 and 3 mm/s. The results were interpreted using a rule-of-mixtures model. The mechanical properties of the composites were also investigated using finite element analysis.
中文翻译：
具有气凝胶芯的机械强度高的蜂窝状结构的制造
通过使用光聚合作用增强天然气凝胶基质的选定区域来制造蜂窝状气凝胶复合材料。首先，通过将硅氧烷水解缩合，并向胶凝溶液中添加多官能丙烯酸单体和可见光引发剂来合成醇凝胶。然后将醇凝胶放在可编程的翻译台上，并暴露于激光下。在暴露区域引发聚合和机械增强。暴露后，将醇凝胶超临界干燥。可以通过改变平移，在天然气凝胶的典型值（11 mW / mK和0.75 MPa）和均匀聚合的复合材料的典型值（65.8 mW / mK和36.26 MPa）之间改变所得蜂窝的热导率和平面外模量。平台速度在2到3 mm / s之间。使用混合规则模型解释结果。还使用有限元分析研究了复合材料的机械性能。
更新日期：2018-01-19
中文翻译：
具有气凝胶芯的机械强度高的蜂窝状结构的制造
通过使用光聚合作用增强天然气凝胶基质的选定区域来制造蜂窝状气凝胶复合材料。首先，通过将硅氧烷水解缩合，并向胶凝溶液中添加多官能丙烯酸单体和可见光引发剂来合成醇凝胶。然后将醇凝胶放在可编程的翻译台上，并暴露于激光下。在暴露区域引发聚合和机械增强。暴露后，将醇凝胶超临界干燥。可以通过改变平移，在天然气凝胶的典型值（11 mW / mK和0.75 MPa）和均匀聚合的复合材料的典型值（65.8 mW / mK和36.26 MPa）之间改变所得蜂窝的热导率和平面外模量。平台速度在2到3 mm / s之间。使用混合规则模型解释结果。还使用有限元分析研究了复合材料的机械性能。
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