Department of Fire Protection Engineering, Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, The Western Park of the Hi-Tech Industrial Development Zone, Chengdu, Sichuan, PR China; State-Province Joint Engineering Laboratory in Spatial Information Technology for High-speed Railway Safety, Chengdu, Sichuan, PR China.
School of Architecture and Civil Engineering, Anhui University of Technology, 59 Hudong Road, Ma'anshan, Anhui 243002, PR China.
J Hazard Mater. 2018 Jan 15;342:689-697. doi: 10.1016/j.jhazmat.2017.09.001. Epub 2017 Sep 4.
Here, we describe a multifunctional biobased polyelectrolyte multilayer-coated hollow mesoporous silica (HM-SiO@CS@PCL) as a green flame retardant through layer-by-layer assembly using hollow mesoporous silica (HM-SiO), chitosan (CS) and phosphorylated cellulose (PCL). The electrostatic interactions deposited the CS/PCL coating on the surface of HM-SiO. Subsequently, this multifunctional flame retardant was used to enhance thermal properties and flame retardancy of epoxy resin. The addition of HM-SiO@CS@PCL to the epoxy resin thermally destabilized the epoxy resin composite, but generated a higher char yield. Furthermore, HM-SiO played a critical role and generated synergies with CS and PCL to improve fire safety of the epoxy resin due to the multiple flame retardancy elements (P, N and Si). This multi-element, synergistic, flame-retardant system resulted in a remarkable reduction (51%) of peak heat release rate and a considerable removal of flammable decomposed products. Additionally, the incorporation of HM-SiO@CS@PCL can sustainably recycle the epoxy resin into high value-added hollow carbon spheres during combustion. Therefore, the HM-SiO@CS@PCL system provides a practical possibility for preparing recyclable polymer materials with multi-functions and high performances.
在这里，我们通过层层组装，使用中空介孔硅（HM-SiO）、壳聚糖（CS）和磷酸化纤维素（PCL），将一种多功能生物基聚电解质多层涂层空心介孔硅（HM-SiO@CS@PCL）描述为一种绿色阻燃剂。静电相互作用将 CS/PCL 涂层沉积在 HM-SiO 的表面。随后，将这种多功能阻燃剂用于增强环氧树脂的热性能和阻燃性。将 HM-SiO@CS@PCL 添加到环氧树脂中会使环氧树脂复合材料热不稳定，但会产生更高的炭产率。此外，HM-SiO 由于具有多种阻燃元素（P、N 和 Si），与 CS 和 PCL 协同作用，在提高环氧树脂的消防安全方面发挥了关键作用。这种多元素、协同的阻燃体系可显著降低（51%）峰值放热率，并大量去除可燃分解产物。此外，HM-SiO@CS@PCL 的加入可以在燃烧过程中将环氧树脂可持续地回收成高附加值的空心碳球。因此，HM-SiO@CS@PCL 体系为制备具有多功能和高性能的可回收聚合物材料提供了一种实用的可能性。
