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Polyphosphazene Elastomers with Alkoxy and Trifluoroethoxy Side Groups

Posted on 2020-01-14 - 23:29
Elastomers based on the polyphosphazene skeletal platform are the subject of broad interest from both biomedical and technological viewpoints. Here, we describe a fourth generation of polyphosphazene elastomers with both 2,2,2-trifluoroethoxy (CF3CH2O−) and nonfluorinated alkoxy groups such as CH3CH2O–, CH3CH2­CH2O–, or CH3CH2­CH2CH2O– units. These structures provided access to elastomers with very low glass transition temperatures in the range of −60 to −90 °C. Variations in the relative percentages of the alkoxy and trifluoroethoxy side groups have a significant influence on the physical properties, which were studied by stress–strain, differential scanning calorimetry, and thermogravimetric analysis techniques. Biomedical materials focused on cardiovascular and dental applications are target applications.

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