Poly(vinylalcohol)/chitosan-based high-strength, fire-retardant and smoke-suppressant composite aerogels incorporating aluminum species via freeze drying
نویسندگان
چکیده
In this work, new types of organic-inorganic composite aerogels were fabricated via the freeze-drying method based on chemical interaction between bio-based chitosan and aluminum chloride, in combination with physical cross-linking among chitosan, inexpensive polyvinyl alcohol (PVA) alumina sols derived from acidic hydrolysis isopropoxide (AIP). The microstructural evolution freeze-dried chitosan-aluminum/PVA (CAP) revealed that varied amount salt could influence three-dimensional architecture. Especially, CA1.5P aerogel herringbone-like structure had high compressive strength 8.55 MPa, corresponding to specific modulus 66.3 m2 s−2. Compared polymeric chitosan/PVA aerogel, CAP showed better fire retardancy, as confirmed by limited oxygen index (LOI) tests cone calorimeter (CC) tests. Remarkably, introduction inorganic components AIP (about 7.7–20.1 wt%) led an increased LOI value (35%–41.1%) lower total heat release smoke release. proposed mechanism suggested enhanced flame retardancy benefitted greatly formation alumina-rich hybrid chars assistance thermal degradation which resulted barrier effects controlling hazards. addition, silanization modification was performed a facile vapor deposition (CVD) treatment improve hydrophobicity. aluminum-incorporated mechanical strength, good fire-resistance smoke-suppressant performance be seen potential alternatives traditional flame-retardant foams.
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ژورنال
عنوان ژورنال: Composites Part B-engineering
سال: 2021
ISSN: ['1879-1069', '1359-8368']
DOI: https://doi.org/10.1016/j.compositesb.2021.108919