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采用层层自组方法在剑麻纤维素微晶(SFCM)表面吸附天然聚电解质壳聚糖(CH)和植酸(PA),构筑可再生CH/PA阻燃涂层,用Zeta电位、热重分析(TGA)、场发射扫描电镜(FESEM)、垂直燃烧测试(VFT)和燃烧量热仪(MCC)等手段对复合材料进行了表征。Zeta电位和FESEM结果显示,在CH和PA吸附过程中电位正负交替变化,SFCM表面局部位置被一层凸起的涂层包覆。TGA和FESEM结果表明,随着CH/PA层数的增加复合材料的初始分解温度由299℃降低至257℃,残炭率由5.41%提高至37.64%,SFCM(CH/PA)5的TG残炭物表面未出现螺旋状收缩,纤维素形貌基本上不变;VFT结果显示,SFCM(CH/PA)5续燃时间(39 s)比纯SFCM(150 s)缩短了111 s。MCC结果表明,SFCM(CH/PA)5的热释放速率峰值(pkHRR)和热释放总量(Total HR)与纯SFCM相比分别减少70.6%和79.2%,表明CH/PA涂层具有明显提高SFCM阻燃性能的作用。
The natural polyelectrolyte chitosan (CH) and phytic acid (PA) were adsorbed on the surface of sisal cellulose microcrystal (SFCM) by layer by layer method to construct a renewable CH / PA flame retardant coating with Zeta potential, (TGA), field emission scanning electron microscopy (FESEM), vertical combustion test (VFT) and combustion calorimeter (MCC) were used to characterize the composites. The Zeta potential and FESEM results show that the potentials change alternately in positive and negative directions during the adsorption of CH and PA, and the local position of the SFCM surface is covered by a convex coating. The results of TGA and FESEM showed that the initial decomposition temperature of the composites decreased from 299 ℃ to 257 ℃ and the carbon residue rate increased from 5.41% to 37.64% with the increase of CH / PA layers. The TG residue of SFCM (CH / PA) 5 The results of VFT showed that the flashover time of SFCM (CH / PA) 5 (39 s) was shortened by 111 s than that of pure SFCM (150 s). MCC results showed that the peak heat release rate (pkHRR) and total heat release (SFC) of SFCM (CH / PA) 5 decreased by 70.6% and 79.2% compared with the pure SFCM respectively, SFCM flame retardant properties.