Fabrication of Green Alginate-based and Layered Double Hydroxides Flame Retardant for Enhancing the Fire Retardancy Properties of Polypropylene

Publication date: Available online 20 January 2020Source: Carbohydrate PolymersAuthor(s): Sheng Xu, Si-Yu Li, Min Zhang, Hong-Yan Zeng, Kun Wu, Xian-Yao Tian, Chao-Rong Chen, Yong PanAbstractAn efficient and bio-based alginate pillared hydrotalcite (SA@LDHs) was fabricated via calcination-reconstruction manner with sodium alginate (SA) and hydrotalcite (LDHs-C), and used as novel flame retardant for polypropylene (PP). The morphologies and combustion properties of SA@LDHs and its hybrid with PP composites (PP/SA@LDHs) had been characterized by SEM, TGA, cone calorimetry, LOI and UL-94 measurements. With 30 wt% loading, the SA@LDHs achieved a LOI value of 30.9% and a UL-94 V-0 rating, whereas the LDHs-C exhibited only LOI value of 27.6% and a UL-94 V-1 rating. The peak heat release rate, total heat release and total smoke production of PP/SA@LDHs were 260.8 kW m−2, 61.3 MJ m−2 and 8.2 m2, respectively, which presented declines of 69.2%, 42.8% and 32.2% compared with those of Neat PP. These improvements could be attributed to the presence of the radical-trapping effect of SA, which leading to promote PP chains to participate in the carbonization process.
Source: Carbohydrate Polymers - Category: Biomedical Science Source Type: research