Hits:

Indexed by:期刊论文

Date of Publication:2012-03-01

Journal:JOURNAL OF POLYMER RESEARCH

Included Journals:SCIE、EI

Volume:19

Issue:3

ISSN No.:1022-9760

Key Words:Phenyl-s-triazine; Poly(aryl ether sulfone); Phthalazinone; Thermal analysis

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. Non-isothermal 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 Ea and slighter mechanical property-change compared to sulfone-rich copolymers and generic aromatic polyether sulfone, suggesting strong stabilizing effect of the phenyl-striazine moieties.