Tailoring Properties of Cross-Linked Polyimide Aerogels for Better Moisture Resistance, Flexibility, and Strength

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• 作者：Haiquan Guo ; Mary Ann B. Meador ; Linda McCorkle ; Derek J. Quade ; Jiao Guo ; Bart Hamilton ; Miko Cakmak
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2012
• 出版时间：October 24, 2012
• 年：2012
• 卷：4
• 期：10
• 页码：5422-5429
• 全文大小：448K
• 年卷期：v.4,no.10(October 24, 2012)
• ISSN：1944-8252

文摘

Combinations of rigid and flexible aromatic diamines were used to tailor the properties of octa(aminophenyl)-silsesquioxane (OAPS) cross-linked polyimide aerogels. 2,2鈥?Dimethylbenzidine (DMBZ) or p-phenylenediamine (PPDA) was used in combination with the more-flexible diamine, 4,4鈥?oxydianiline (ODA). The amount of rigid diamine was varied from 0% to 100% of the total diamines in the backbone. The resulting aerogels vary in density, shrinkage, porosity, surface area, mechanical and thermal properties (depending on the type of diamine and the proportions of rigid diamine to flexible diamine used). Replacing ODA with PPDA increases shrinkage that occurs during gelation and processing, while increasing the DMBZ fraction decreases shrinkage. Replacing ODA with 50 mol鈥? of DMBZ maintains the flexibility of thin films, while the moisture resistance of the aerogels is greatly improved.

Keywords:

polyimide; aerogel; mesoporous materials; cross-linking; insulation; polyoligomeric silsesquioxane