Journal
ACS APPLIED POLYMER MATERIALS
Volume 5, Issue 11, Pages 9027-9036Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsapm.3c01485
Keywords
phthalonitrile resin; disulfide bond; curingbehavior; curing mechanisms; thermal and thermo-mechanicalproperties
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In this study, a radical initiation unit (disulfide segment) was introduced into phthalonitrile resins for the first time to investigate the presence of a radical mechanism in the curing process. A disulfide-bond-containing phthalonitrile monomer (DPBPN) was successfully synthesized. The study showed that DPBPN exhibited a low melting point, a wide processing window, and good thermal stability and glass transition temperature during the curing process.
To further investigate the presence of a radical mechanism in the curing process of phthalonitrile resins, a conventional radical initiation unit (disulfide segment) was introduced into phthalonitrile resins for the first time. A disulfide-bond-containing phthalonitrile monomer (DPBPN) was successfully synthesized. Its self-curing reaction could be promoted by disulfide segments in the precursor. Rheological measurements and differential scanning calorimetry showed that DPBPN exhibited a low melting point (124.5 degrees C) and a wide processing window (120 degrees C). Infrared spectroscopy confirmed the formation of isoindoline, triazine, and phthalocyanine structures in the product. Thermal gravimetric analysis and dynamic mechanical analysis suggested the outstanding thermal stability and high glass transition temperature (T-g) of the cured resin with a moderate curing process.
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