Sui Yanlong, Qu Lijie, Dai Xueyan, Li Peihong, Zhang Jinrui, Luo Shuai, Zhang Chunling
School of Materials Science and Engineering, Jilin University Changchun 130025 PR China
RSC Adv. 2020 Mar 27;10(21):12492-12503. doi: 10.1039/d0ra00072h. eCollection 2020 Mar 24.
Toxicity and environmental issues have elicited research attention regarding the need to prepare a green flame retardant with high flame retardancy. Here, a supermolecular self-assembly technology was used to prepare nickel phytate as shell materials aggregated on aminated silica nanotemplates through electrostatic interactions as a green novel flame retardant (Ni@SiO-PA). After incorporating the obtained core-shell structured Ni@SiO-PA into epoxy resin (EP), the supermolecular shell effectively enhanced the adhesive property between the nanoparticles and the EP matrix. The thermal stability was improved, and the peak heat release rate decreased significantly after introducing the well-characterized Ni@SiO-PA. The absorbance intensity of the toxic aromatic compounds also decreased. Moreover, the char yield of the EP composites was improved because of the synergetic coupled effects between the nickel phytate supermolecules and SiO nanotemplates. The possible fire-retardancy mechanism was hypothesized as follows. The crosslinking structure of the silica initially enabled the formation of a polymer network to prevent further decomposition. The N-P synergistic flame-retardancy system then generated a gas barrier and P-rich intumescent char. Besides, char-residue generation was catalyzed by introducing Ni, which isolated the heat and the exchange between oxygen and the matrix. Overall, this study proposes a novel green flame retardant that may enable significant improvements in preparing environmentally friendly organic-inorganic materials with applications in the fields of flame-retardant composites.
毒性和环境问题引发了人们对制备具有高阻燃性的绿色阻燃剂的研究关注。在此，采用超分子自组装技术制备了植酸镍作为壳材料，通过静电相互作用聚集在胺化二氧化硅纳米模板上，作为一种新型绿色阻燃剂（Ni@SiO-PA）。将所得核壳结构的Ni@SiO-PA掺入环氧树脂（EP）后，超分子壳有效地增强了纳米颗粒与EP基体之间的粘附性能。引入表征良好的Ni@SiO-PA后，热稳定性提高，峰值热释放速率显著降低。有毒芳香族化合物的吸光度强度也降低了。此外，由于植酸镍超分子与SiO纳米模板之间的协同耦合效应，EP复合材料的残炭率提高。推测其可能的阻燃机理如下。二氧化硅的交联结构首先促使形成聚合物网络以防止进一步分解。然后，N-P协同阻燃体系产生气体屏障和富含P的膨胀炭。此外，引入Ni催化了残炭的生成，从而隔离了热量以及氧气与基体之间的交换。总体而言，本研究提出了一种新型绿色阻燃剂，这可能在制备用于阻燃复合材料领域的环保型有机-无机材料方面带来显著改进。
