Nonflammable Alginate Nanocomposite Aerogels Prepared by a Simple Freeze-Drying and Post-Cross-Linking Method
作者：Ke Shang, Wang Liao*, Juan Wang, Yu-Tao Wang, Yu-Zhong Wang*, David A.Schiraldi
關鍵字：aerogel, alginate, post-cross-linking, freeze-drying, flame retardant, thermal insulation
論文來源：期刊
具體來源：ACS Applied Materials & Interfaces
發(fā)表時間：2016年
Nonflammable materials based on renewable ammonium alginate and nano fillers (nanoscale magnesium hydroxide, nanoscale aluminum hydroxide, layered double hydroxide, sodium montmorillonite, and Kaolin) were fabricated through a simple, environmentally friendly freeze- drying process, in which water was used as a solvent. A simple and economic post-crosslinking method was used to obtain homogeneous samples. The microstructure of the crosslinked alginate aerogels show three-dimensional networks. These materials exhibit low densities (0.064?0.116 g/cm3), low thermal conductivities (0.024?0.046 W/mK), and useful mechanical strengths (0.7?3.5 MPa). The aerogels also exhibit high thermal stabilities and achieve inherent non fl ammability with limiting oxygen indexes (LOI) higher than 60. Related properties were conducted and analyzed by cone calorimeter (CC), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). These results combine to suggest promising prospects for use of these aerogel nanocomposites in a range of applications.