K. Dai, L. Song, S. H. Jiang, B. Yu, W. Yang, R. K. K. Yuen and Y. Hu (2013) Unsaturated polyester resins modified with phosphorus-containing groups: Effects on thermal properties and flammability. Journal/Polymer Degradation And Stability 98 2033-2040. [In English]
Web link: http://dx.doi.org/10.1016/j.polymdegradstab.2013.07.008
Keywords: Unsaturated polyester resin, Thermal properties, Flame retardancy, Degradation mechanism, FLAME-RETARDANT, FIRE RETARDANCY, EPOXY, COPOLYMERS, BEHAVIOR, DECOMPOSITION, SYSTEMS, INTUMESCENCE, CALORIMETRY, COMPOSITES
Abstract: A novel reactive phosphorus-containing monomer [1-oxo-2,6,7-trioxa-1- phosphabicyclo-[2.2.2]octanemethyl diallyl phosphate, PDAP] was synthesized, and various amounts of PDAP were combined with unsaturated polyester by radical bulk polymerization. The resulting flame-retardant unsaturated polyester resin (FR-UPR) samples were investigated by thermogravimetric analysis (TGA), microscale combustion calorimetry (MCC), and limiting oxygen index (LOI) tests. Due to the relatively high phosphorus content of PDAP (18.2 wt%), incorporation of this monomer into unsaturated polyester resin (UPR) led to a marked decrease in the heat release capacity (HRC), the total heat release (THR), an increase in the LOI and the char yield upon combustion. In order to elaborate the interactions between the UPR and PDAP in degradation, differences between the experimental and theoretical mass losses of a FR-UPR sample were evaluated. Furthermore, thermogravimetry-Fourier transform infrared (TG-FTIR) and real-time Fourier transform infrared (RTIR) spectroscopy were employed to investigate the degradation behavior of UPRs, providing insight into the degradation mechanism. (C) 2013 Elsevier Ltd. All rights reserved.