Polyimide Cellulose Nanocrystal Composite Aerogels

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• 作者：Baochau N. Nguyen ; Elvis Cudjoe ; Anna Douglas ; Daniel Scheiman ; Linda McCorkle ; Mary Ann B. Meador ; Stuart J. Rowan
• 刊名：Macromolecules
• 出版年：2016
• 出版时间：March 8, 2016
• 年：2016
• 卷：49
• 期：5
• 页码：1692-1703
• 全文大小：797K
• ISSN：1520-5835

文摘

Cellulose nanocrystals derived from tunicates (t-CNC) were used as a reinforcing nanofiller for polyimide aerogels. Two sets of polyimide aerogels, containing either 2,2′-dimethylbenzidine (DMBZ) or 4,4′-oxydianiline (ODA) and 3,3′,4,4′-biphenyltetracarboxylic acid dianhydride (BPDA) cross-linked with 1,3,5-tris(4-aminophenoxy)benzene (TAB), were studied. Total solids composition of the aerogels were kept constant at 7.5 wt %, with 0–13.33 wt % of the total solids being the carboxylic acid-functionalized t-CNC (t-CNC–COOH) filler. The incorporation of the t-CNC–COOH, with carboxylic acid content of either 560 or 920 mmol/kg, in the polyimide aerogel networks improved both physical and mechanical properties of the final materials. Isothermal aging of t-CNC–COOH aerogel composites was also conducted at 150 and 200 °C for 24 h. Higher content t-CNC–COOH/polyimide aerogels showed less change in their density and reduced shrinkage during aging, which further emphasized the effect of the t-CNC–COOH reinforcement in retaining the structural integrity of the aerogel.