Abstract
This study synthesized a heterocyclic acetal-containing monomer, 7a,14c-dihydronaphtho[2,1-b] naphtho [1′,2′:4,5] furo[3,2-d] furan (DHNF) with a melting point of 230 °C, through the acidic reaction of 2-naphthol and glyoxal. Two types of heterocyclic polyamides were produced via condensation polymerization of DHNF Diamine with terephthalic acid (aromatic diacid) and sebacic acid (aliphatic diacid), achieving melting points exceeding 400 °C. Spectroscopic methods, including Fourier-transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance spectroscopy (1HNMR), were used to identify the synthesized compounds. Thermal analysis, including Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC), demonstrated the thermal stability of the polyamides with acetal functional groups, showing a 10 % weight loss at 193.6 ℃ for PA-1 and 420 ℃ for PA-2, with crystallization temperatures of 155 °C and 180 °C for Types 1 and 2, respectively. The results indicate that the acetal functional group enhances polyamide solubility and processability. Viscometry revealed higher inherent viscosity for PA-2, attributed to its higher molecular weight.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
