Structural Basis for Intumescence – Part III – Thermal Degradation Study of Intumescent Polymers Containing Spirophosphorus Moiety in the Backbone

Sivasamy, P.; Geetha, Bashyam; Vijayakumar, Chinnaswamy Thangavel; Fink, Johannes Karl

doi:10.1080/03602550903285526

Cited by 4 publications

(1 citation statement)

References 20 publications

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“…It is assumed that the aromatic spriopolyphosphates in the FR PSBPBP decomposed in the earlier stage to form volatile substances such as water and PO. In the gas phase, the free radical, PO·could dilute the combustible gas and capture active free radicals to interrupt the flame 19, 20. The thermal stability of the PC/PSBPBP system were improved by the formation of phosphoric acid esters and phosphoric acid during the decomposition of PC/PSBPBP system at higher temperature, which could accelerate the char forming process by affecting the cross‐linking reaction of PC.…”

Section: Resultsmentioning

confidence: 99%

Effect of talc on thermal stability and flame retardancy of polycarbonate/PSBPBP composite

Zhao

Wei

Qian

et al. 2012

J of Applied Polymer Sci

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A novel flame retardant poly(3-aminopropyl methylsiloxane bis(3-hydroxy phenyl spirocyclic pentaerythritol bisphosphate)) (PSBPBP) in combination with talc was blended into polycarbonate (PC) by melt compounding. The flame retardancy and thermal stability of PC/PSBPBP/talc composites were investigated by limiting oxygen index (LOI) test, UL-94 rating test, thermogravimetric analysis (TGA), Raman spectroscopy (RS), and scanning electron microscope (SEM). The mechanical properties were also measured in this work. Increasing talc content leads to observed improvement on flame retardancy of PC composites. LOI value of PC/PSBPBP/10 wt % talc system was 34, and this system passed V0 rating in the UL-94 test. The char yield at 700 C was 28.2% and the onset decomposition temperature shifted up to 540 C for PC/10% PSBPBP/10% talc system in TGA. In the Raman measure, the R value and G linewidth of PC/PSBPBP with 10 wt % talc composite increased to 1.41 and 65 cm À1 from 1.12 and 43 cm À1 of pure PC, respectively. The Raman results suggest that the char residue of PC/PSBPBP with talc composites was denser and had better barrier property, which is agreement with the SEM results. Besides, talc had no remarkable influence on the mechanical properties of PC/PSBPBP composites.

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Section: Resultsmentioning

confidence: 99%