Ur Rehman Zeeshan, Huh Seok-Hwan, Ullah Zakir, Pan Ye-Tang, Churchill David G, Koo Bon Heun
College of Mechatronic Engineering, Changwon National University, Changwon, Gyeongsangnam-do 51140, Republic of Korea.
Department of Chemistry, Molecular Logic Gate Laboratory, Korea Advanced Institute of Science and Technology (KAIST), Republic of Korea.
Carbohydr Polym. 2021 Nov 15;274:118626. doi: 10.1016/j.carbpol.2021.118626. Epub 2021 Sep 1.
In this work, starch-clay-TiO-based nanocomposites were deposited on cotton fabric through layer-by-layer (LBL) process and their effect on the flame retardancy, inhibition of pyrolysis and combustion processes were discussed in details. Polyelectrolyte solutions/suspensions of cationized starch and VMT (vermiculite)/TiO nanoparticles were used to deposit these nanocomposites in the form of multi-layered coatings (5, 7, 10 and 15 bilayers). Uniform fabric coverage and presence of electrolytes was imaged by scanning electron microcopy (LV-SEM), attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) and EDX characterizations. The greatest pyrolysis reduction was found for the StVT-7 sample (7 bilayers); ~30% and 21%, based on microscale combustion calorimetry (MCC) and thermogravimetric analysis (TGA). When using MCC, the improved values of the PHRR ~ 193 W/g, THR ~ 10.7 kJ/g), HRC ~ 390 J/g∙K and LOI ~ 22.2% were found for the StVT-7 sample which was strongly supported by the UL-94 test.
在本研究中，通过层层（LBL）工艺将淀粉-粘土-TiO基纳米复合材料沉积在棉织物上，并详细讨论了它们对阻燃性、热解和燃烧过程的抑制作用。使用阳离子化淀粉和VMT（蛭石）/TiO纳米颗粒的聚电解质溶液/悬浮液以多层涂层（5、7、10和15个双层）的形式沉积这些纳米复合材料。通过扫描电子显微镜（LV-SEM）、衰减全反射傅里叶变换红外光谱（ATR-FTIR）和能谱（EDX）表征对织物的均匀覆盖和电解质的存在情况进行了成像。发现StVT-7样品（7个双层）的热解减少最多；基于微观燃烧量热法（MCC）和热重分析（TGA），热解减少约30%和21%。使用MCC时，StVT-7样品的热释放速率峰值（PHRR）193 W/g、热释放总量（THR）10.7 kJ/g、热释放能力（HRC）390 J/g∙K和极限氧指数（LOI）22.2%有所提高，这得到了UL-94测试的有力支持。
