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Novel bio-based polyols for flame retardant polyurethane sealants
Posted on December 22, 2015 by Henri VAHABI
Novel ricinoleic acid (RA) based phosphorus and nitrogen-containing flame retardant polyols (FRPE) were successfully synthesised and characterised by FTIR, 1H NMR and 13C NMR.Chinese researchers developed bio-based polyols for flame retardant polyurethane sealants.
The flame retardant polyurethane sealants (FR-PUS) were prepared by curing FRPE with methylene diphenyl diisocyanate (MDI-50). The flame retardant properties and thermal decomposition of FR-PUS were investigated by the limiting oxygen index (LOI), cone calorimeter testing (CCT) and thermogravimetric analysis (TGA).
FRPE improve flame retardancy. The results showed that FRPE could enhance the thermal stability and improve the flame retardancy of polyurethane sealants (PUS) without any other flame retardant. Moreover, the gaseous degradeation products of FR-PUS were analysed by thermogravimetric analysis/infrared spectrometry (TG-IR), providing insight into the thermal degradation mechanism. FTIR and dynamic mechanical analysis (DMA) were used to explore the chemical components of the char after CCT and mechanical properties of PUS. ,;The study is published in: Polymer Degradation and Stability.
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A new super-efficiently flame-retardant bioplastic-poly (lactic acid): flammability, thermal decomposition behavior and tensile properties
Posted on December 1, 2015 by Henri VAHABI
ACS Sustainable Chem. Eng.
Publication Date (Web): November 24, 2015
Abstract
In this study, a super-efficiently flame-retardant bioplastic-poly (lactic acid)-was developed by incorporating gas-solid biphase flame retardant, N, N’-Diallyl-P-phenylphosphonicdiamide (P-AA), into PLA matrix. The flame retardancy of PLA/P-AA was investigated by limiting oxygen index (LOI), vertical burning test (UL94) and cone calorimeter test. Surprisingly, it was noted that only 0.5 wt% loading of P-AA increased LOI value of PLA from 20.5 to 28.4 and passed UL 94 V-0 rating at 3.2 mm thickness. In order to understand the effect of P-AA on thermal decomposition behavior of PLA, a comprehensive study was investigated in this paper, including (i) adopting modified Coats-Redfern method to study the thermal decomposition kinetics of PLA and PLA/P-AA systems; (ii) characterizing the evolved gaseous products and the residues in the condense phase by thermogravimetry linked Fourier transform infrared spectroscopy (TGA–FTIR) and variable temperatures Fourier transform infrared spectroscopy (VT-FTIR) techniques, respectively. Moreover, tensile properties of PLA and PLA/P-AA were studied.
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Flame retardancy of polymers 