Aromatic/aliphatic diamine derivatives for advanced compositions and polymers
申请人:The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
公开号:US07723464B2
公开(公告)日:2010-05-25
Novel compositions of matter comprise certain derivatives of 9,9-dialkyl fluorene diamine (AFDA). The resultant compositions, whether compositions of matter or monomers that are subsequently incorporated into a polymer, are unique and useful in a variety of applications. Useful applications of AFDA-based material include heavy ion radiation shielding components and components of optical and electronic devices.
Architectural Editing of Polyesters and Polyurethanes via Palladium(II)-Catalyzed [3,3]-Sigmatropic Oxo-Rearrangements
作者:Rachael A. J. Ditzler、Rachel M. Rapagnani、Nathaniel K. Berney、Ross F. Koby、Erin C. Krist、Benjamin J. Kruse、Hilary D. Fokwa、Ian A. Tonks、Aleksandr V. Zhukhovitskiy
DOI:10.1021/jacs.4c02917
日期:2024.6.5
increase in both strain at break and toughness after rearrangement. Additionally, the incorporation of alkenes in the polymer backbone through the rearrangement enables facile deconstruction via ethenolysis. In all, we disclose a powerful and broad-scope strategy to edit the architecture of polymer backbones and thereby tune their physical and chemical properties.
Structure–Activity Relationships for Anion-Responsive Poly(squaramides): Support for an Analyte-Induced Noncovalent Polymer Cross-Linking Mechanism
作者:Ali Rostami、Gérald Guérin、Mark S. Taylor
DOI:10.1021/ma401263q
日期:2013.8.27
Poly(squaramides) are a novel class of anion-responsive macromolecules that incorporate the diaminocyclobutenedione hydrogen bond donor group into the polymer backbone. Herein, the synthesis and properties of a series of fluorene-based poly(squaramides) varying in conformational rigidity, squaramide content, and propensity for aggregation are described. Structure activity relationships for the anion sensory behavior of these polymers (as probed by fluorescence titrations, dynamic light scattering, confocal fluorescence microscopy, and transmission electron microscopy) indicate that anion-induced polymer aggregation leads to a cooperative response with enhanced levels of sensitivity and selectivity. These observations are consistent with a mechanism involving noncovalent cross-linking of polymer chains through squaramide anion hydrogen-bonding interactions and point toward new applications of polyamides as stimulus-responsive materials.
Novel Aromatic/Aliphatic Diamine Derivatives For Advanced Compositions And Polymers
申请人:Delozier M. Donovan
公开号:US20080004419A1
公开(公告)日:2008-01-03
Novel compositions of matter comprise certain derivatives of 9,9-dialkyl fluorene diamine (AFDA). The resultant compositions, whether compositions of matter or monomers that are subsequently incorporated into a polymer, are unique and useful in a variety of applications. Useful applications of AFDA-based material include heavy ion radiation shielding components and components of optical and electronic devices.