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Sun, Ling; Ding, Lan; Guo, Xiuyan; Wang, Yuhan; Liu, Xiaohui; Ren, Yuanlin; Li, Yuesheng
International journal of biological macromolecules, August 2024, Letnik: 275, Številka: Pt 2Journal Article
Polymeric materials such as fabric and foam have high flammability which limits their application in the field of fire protection. To this end, an organic-inorganic polymer colloid constructed from carboxymethyl chitosan and ammonium polyphosphate was used to improve the flame retardancy of flax fabric (FF) and rigid polyurethane foam (RPUF) based on a “one for two” strategy. The modification processes of FF and RPUF relied on pad-dry-cure method and UV-curing technology, respectively, and the modified FF and RPUF were severally designated as CMC/APP-FF and RFR-RPUF. Flame retardancy studies showed that CMC/APP-FF and RFR-RPUF exhibited limiting oxygen index values as high as 39.4 % and 42.6 %, respectively, and both achieved self-extinguishing behavior when external ignition source was removed. Thermogravimetric analysis and cone calorimetry test confirmed that CMC/APP-FF and RFR-RPUF had good charring ability and demonstrated reduced peak heat release rate values of 90.1 % and 10.8 %, respectively, distinct from before they were modified. In addition, condensed phase analysis showed that after burning, CMC/APP-FF became an integration char structure, whereas RFR-RPUF turned into a sandwiched char structure. In summary, the “one for two” strategy reported in this work provides a new insight into the economical fabrication of flame-retardant polymeric materials. •An organic-inorganic polymer colloid was constructed using CMC and APP.•The colloid gave flame retardancy to FF and RPUF based on a “one for two” strategy.•The modified FF and RPUF exhibited LOI values up to 39.4 % and 42.6 %, respectively.•The modified FF and RPUF formed two different char structures after combustion.
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