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Flame retardancy and smoke suppression of molybdenum trioxide doped magnesium hydrate in flexible polyvinyl chloride
Author(s) -
Dang Li,
Lv Zhihui,
Du Xinliu,
Tang Delin,
Zhao Yuntian,
Zhu Donghai,
Xu Shiai
Publication year - 2020
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.4933
Subject(s) - limiting oxygen index , materials science , molybdenum trioxide , char , thermogravimetric analysis , polyvinyl chloride , antimony trioxide , nuclear chemistry , molybdenum , magnesium , fourier transform infrared spectroscopy , fire retardant , smoke , chemical engineering , polymer chemistry , composite material , pyrolysis , organic chemistry , metallurgy , chemistry , engineering
In this paper, an effective flame retardant consisting of hierarchical magnesium hydrate (MH) nanosheets doped with molybdenum trioxide nanoparticles (MO@MH) was successfully synthesized via a hydrothermal process. Then, MO@MH, MH, and MH/MO were respectively incorporated into flexible polyvinyl chloride (fPVC) to prepare a series of composites via melt blending. The results of limiting oxygen index (LOI), UL‐94, and cone calorimetry test showed that MO@MH exhibited better flame retardancy and smoke suppression than MH and MH/MO due to the synergistic effect of MO and MH, and the hierarchical structure of MO@MH. With the addition of 20 phr MO@MH, LOI value of fPVC was increased from 23.9% to 33.8% , and UL‐94 reached V0 rating. The peak heat release rate, total heat release, peak smoke production rate, and total smoke production were decreased to 143.0 kW/m 2 , 44.9 MJ/m 2 , 0.0093 m 2 /s and 29.4 m 2 , respectively. The thermogravimetric analysis results suggested that MO@MH greatly promoted the dehydrochlorination of fPVC at lower temperature, so that more compact and continuous char residues were formed. The Fourier transform infrared spectroscopy results indicated that MO@MH can prevent chain scission and oxidation of fPVC carbonaceous backbone, and as a result less smoke was released.