Authors: Guipeng Yu Cheng Liu Bing Li Liwei Wang Jinyan Wang Xigao Jian
Publish Date: 2012/03/01
Volume: 19, Issue: 3, Pages: 9829-
Abstract
The effect of the incorporation of phenylstriazine units into the main chain of phthalazinonebased polyether sulfones on initial decomposition temperature activation energy thermalmechanical property and possible degradation mechanism has been investigated To this purpose decomposition of polyphthalazinone ether sulfone phenylstriazine 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 FlynnWallOzawa Friedman and Kissinger In the conversion range 5–30 studied solidstate decomposition process of PPESPs is found to be a mechanism involving phase boundary controlled reaction E a 189–201 kJ mol−1 except that phenylstriazinerich copolymers exhibit a mechanism involving threedimensional diffusion E a 196–225 kJ mol−1 in terms of Coats–Redfern method The phenylstriazinerich copolymers display much higher E a and slighter mechanical propertychange compared to sulfonerich copolymers and generic aromatic polyether sulfone suggesting strong stabilizing effect of the phenylstriazine moieties
Keywords: