Effects of phenyl-s-triazine moieties on thermal stability and degradation behavior of aromatic polyether sulfones

Abstract

The effect of the incorporation of phenyl-striazine units into the main chain of phthalazinone-based polyether sulfones on initial decomposition temperature, activation energy, thermal-mechanical property and possible degradation mechanism has been investigated. To this purpose, decomposition of poly(phthalazinone ether sulfone phenyl-s-triazine) copolymers (PPESPs) of different monomer compositions have been studied by utilizing thermogravimetry and differential scanning calorimetry. Nonisothermal experiments under nitrogen were performed, and the apparent activation energy (E a ) was calculated by isoconversional and conversional methods including the methods of Flynn-Wall-Ozawa, Friedman and Kissinger. In the conversion range (5-30%) studied, solid-state decomposition process of PPESPs is found to be a mechanism involving phase boundary controlled reaction (E a : 189-201 kJ mol −1 ) except that phenyl-s-triazine-rich copolymers exhibit a mechanism involving three-dimensional diffusion (E a : 196-225 kJ mol −1 ) in terms of Coats-Redfern method. The phenyl-s-triazine-rich copolymers display much higher E a and slighter mechanical property-change compared to sulfone-rich copolymers and generic aromatic polyether sulfone, suggesting strong stabilizing effect of the phenyl-striazine moieties.

Recycling of polyurethane wastes using different carboxylic acids via acidolysis to produce wood adhesives

“…Many works associating higher thermal stability to the presence of aromatic moieties are reported in literature. Yu et al 34 studied the effect of the incorporation of phenyl‐s‐triazine units on the degradation of polyether sulfones, reporting the strong stabilizing effect of the phenyl‐s‐triazine moieties. Liu and Jian 35 studied the thermal degradation kinetics of aromatic copolyamides containing phthalazinone moieties and reported that the presence of the phthalazinone structure increased the thermal decomposition activation energy of the polymers.…”

Branched phenyl‐s‐triazine moieties to enhance thermal properties of phthalonitrile thermosets

“…Recently, a focus in the development of PN resins has been the modification of their thermal resistance . Thermostable moieties such as heterocyclic pyridine moieties, aromatic naphthyl structures,, silane‐bearing structures and s ‐triazine units, , have been separately introduced to PN oligomer backbones. Some of the cured resins exhibit glass transition temperatures ( T g ) exceeding 400 °C.…”

Self-promoted curing phthalonitrile with high glass transition temperature for advanced composites

“…These resins have been considered as an ideal material for applications in various fields such as marine, aerospace and electronic uses [4][5][6][7][8]. However, the conventional phthalonitriles have the problem of poor processability resulting from their unexpected properties such as high curing temperature, long curing time and narrow processing window (temperature between the melting point and the polymerization temperature) [9,10].…”