Flame-retardant polyvinyl alcohol membrane with high transparency based on a reactive phosphorus-containing compound

Abstract

Flame-retardant polyvinyl alcohol (PVA) membranes with high transparency and flexibility were prepared by mixing an aqueous solution of a phosphorus-containing acrylic acid (AOPA) with PVA. The reaction between AOPA and PVA, the transparency, the crystallinity and the flexibility of the membrane were investigated with Fourier transform infrared spectrometry (FTIR), UV–vis light transmittance, X-ray diffraction and tensile tests, respectively. The limited oxygen index (LOI) and vertical flame (UL 94 VTM), microscale combustion calorimetry, thermogravimetric analysis (TGA) and TGA-FTIR were employed to evaluate the flame retardancy as well as to reveal the corresponding mechanisms. Results showed that PVA containing 30 wt% of AOPA can reach the UL 94 VTM V0 rating with an LOI of 27.3% and retain 95% of the original transparency of pure PVA. Adding AOPA reduces crystallinity of PVA, while the flexibility is increased. AOPA depresses the thermal degradation of PVA and promotes char formation during combustion. The proposed decomposition mechanism indicates that AOPA acts mainly in the condensed phase.

Fire Behavior of Natural Rubber Filled with Intumescent Flame Retardant Containing Graphite

“…b and the main absorption peaks for reactants and MPP‐G are shown in Table . The absorption peaks in Table for melamine, pentaerythritol, and graphite exhibit good agreement with the data reported in the literature . FTIR spectrum of MPP‐G, Fig.…”

“…This indicates that PP is connected to nitrogen atoms of triazine ring of melamine . The peaks at 1,618, 1,516, 1,400, 1,108, 1,049 cm −1 are referred to CC, CN, CH 2 , POC, and POH groups, respectively . The results of 1 H NMR and FTIR confirm that the reactants are interacted to form MPP‐G.…”

Synthesis of a novel aluminium salt of nitrogen-containing alkylphosphinate with high char formation to flame retard acrylonitrile–butadiene–styrene

“…The Lewis salts triggering ABS to decompose at low temperature have been found in the tin-and zinc-based salts/ABS system [26]. Besides, the same catalytic effect was also observed in the aluminium salt of phosphinate-filled polymer such as polyvinyl alcohol [27], EP [28] and polyamide [29].…”

High catalytic performance of the first electrospun nano‐biohybrid, Mn3O4/copper complex/polyvinyl alcohol, from Amaranthus spinosus plant for biomimetic oxidation reactions

“…The patterns show strong crystalline reflections at around 2θ=19.92 and a shoulder at 22.74. The two peaks are characteristic of PVA representing reflections from (101) and (200) from monoclinic unit cells . It can be seen that the XRD patterns of the nanocomposite have the peaks corresponding to the semi‐crystalline nature of pure PVA .…”