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Synthesis and characterization of new adamantane-based cardo polyamides

โœ Scribed by Sheng-Huei Hsiao; Chin-Tang Li


Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
154 KB
Volume
37
Category
Article
ISSN
0887-624X

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โœฆ Synopsis


A novel series of cardo polyamides bearing the 2,2-adamantylidene unit were directly prepared from a new adamantane-based dietheramine, 2,2-bis[4-(4aminophenoxy)phenyl]adamantane, with various aromatic dicarboxylic acids using triphenyl phosphite (TPP) and pyridine as condensing agents. These polyamides had inherent viscosities ranging from 0.44 to 0.89 dL/g. All the polymers showed an amorphous nature by X-ray diffraction measurements, and most of them were easily soluble in polar aprotic solvents such as NMP and DMAc. The flexible and tough films cast from the polymer solutions possessed a tensile strength of 91-101 MPa and an elongation-at-break of 5-13%. The polyamides were thermally stable up to 450ยฐC in air or in nitrogen. Most of them revealed distinct glass transition on the differential scanning calorimetry (DSC) traces, and their T g s were recorded in the range of 230 -269ยฐC . Softening temperatures (T s ) of these polyamides were in the range of 272-308ยฐC by thermomechanical analysis (TMA).


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