Preparation, intermolecular motion, and thermal properties of thiodiphenyl epoxy

Abstract

The thiodiphenyl epoxy (THEP) was prepared by the 4,4 0 -thiodiphenol (THDOL) and the epichlorohydrin (ECH) without using any NaOH or KOH catalysts. The THEP possessed weak hydrogen bonding in the cured THEP/DGEBA system. The intermolecular motion parameters k and q were 0.26 and À168.5, respectively, which determined by the Gordon-Taylor and Kwei equations. The soft sulfide linkage (ASA) of the THEP degraded at lower temperature than cured DGEBA material, and further to form various thermal stable sulfate derivative chars. The char yields increased from 11.43 to 25.94 wt % and from 0.65 to 1.04 wt % in the nitrogen and air, respectively. Introduction of the THEP into the DGEBA could provide the antioxidation thermal property and improve the thermal stability of the DGEBA epoxy in the air. In the air atmosphere, the activation energies of the second thermal degradation were increased from 66.67 to 103.42 kJ/mol. V C 2010 Wiley Periodicals, Inc. J Appl Polym

Synthesis and characterisation of new sulphur-containing epoxy networks

“…Furthermore, there are comparatively few studies in the literature on the use of sulphur in epoxy resins despite some evidence of improved adhesion 14 and thermal stability. 15 It is more common, however, that sulphur-containing mercaptan resins are used as hardeners 16,17 in epoxy resin systems where the rapid curing at low temperature and excellent fluid resistance makes them ideal sealants. Sulphur-containing amino acid hardeners have also been used recently as a replacement for less environmentally friendly curing agents 18 that exhibit promising behaviour because thermal stability is unaffected by their usage.…”

Microwave-assisted synthesis of isosorbide-derived diols for the preparation of thermally stable thermoplastic polyurethane

“…When comparing the two diols 4a and 4b , it can be observed that the diol THIO-ISOH retained higher weight than BPA-ISOH at temperature higher than 400 °C in nitrogen and 450 °C in air; also the char residue at high temperature (600 °C) was higher for THIO-ISOH than BPA-ISOH. This could be ascribed to a greater promotion of char formation by the sulphur in THIO-ISOH, which hindered the formation of volatile degradation products [ 28 ]; in air sulphur could also provide an additional protection at high temperature in the form of sulfate [ 43 ].…”