Zhang Jie, Yan Wei, Huang Weijiang, Wang Kui, Tian Qin, Tu Chunyun, Guan Xingyu, Wu Shaoyuan, Ba Xuan, Wei Chunle, Ye Tong, Chen Jingyu, Zhang Yi
School of Materials Science and Engineering, Guiyang University, Guiyang 550005, China.
National Engineering Research Center for Compounding and Modifcation of Polymer Materials, Guiyang 550014, China.
Polymers (Basel). 2025 Jun 6;17(12):1588. doi: 10.3390/polym17121588.
Incorporating a 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide-based derivative (1,4-bis(diphenoxyphosphoryl)piperazine, DIDOPO) in combination with modified calcium sulfate whiskers (MCSWs) improved the flame retardancy, thermal stability, and rheological properties of a polyethylene oxide (PEO) composite. The synergistic flame-retardant effect of DIDOPO and MCSW on the PEO system was investigated. After introducing 5 wt.% MCSW and 10 wt.% DIDOPO into PEO, the UL-94 rating of the composite reached V-0, and the limiting oxygen index was increased to 26.5%. Additionally, the peak and average heat release rates and total heat release of the PEO/10% DIDOPO/5% MCSW composite decreased by 38.9%, 22%, and 20.07%, respectively. The results of a thermogravimetric analysis (TGA) revealed that PEO/10% DIDOPO/5% MCSW displayed an improved initial thermal stability and rate of char formation compared to those of the PEO matrix. The results of TGA/Fourier transform infrared analysis indicated that the composites exhibited phosphorus-containing groups during thermal degradation, based on the characteristic absorption peaks, and increased amounts of gas-phase volatiles. The morphologies and structures of the residues indicated that the PEO/10% DIDOPO/5% MCSW blend was less stable than PEO during combustion. The MCSW mixture formed a denser, more continuous carbon layer on the composite surface during combustion. The rheological behavior indicated that the high complex viscosity and moduli of PEO/10% DIDOPO/5% MCSW promoted the cross-linking network structure of the condensed phase during combustion. MCSW exhibited an excellent flame retardancy and improved thermal stability, which are potentially promising for use in fire safety applications.
将基于9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物的衍生物（1,4-双（二苯氧基磷酰基）哌嗪，DIDOPO）与改性硫酸钙晶须（MCSWs）相结合，改善了聚环氧乙烷（PEO）复合材料的阻燃性、热稳定性和流变性能。研究了DIDOPO和MCSW对PEO体系的协同阻燃作用。在PEO中引入5 wt.%的MCSW和10 wt.%的DIDOPO后，复合材料的UL-94等级达到V-0，极限氧指数提高到26.5%。此外，PEO/10%DIDOPO/5%MCSW复合材料的峰值热释放速率、平均热释放速率和总热释放量分别降低了38.9%、22%和20.07%。热重分析（TGA）结果表明，与PEO基体相比，PEO/10%DIDOPO/5%MCSW具有更高的初始热稳定性和成炭率。TGA/傅里叶变换红外分析结果表明，基于特征吸收峰，复合材料在热降解过程中表现出含磷基团，且气相挥发物含量增加。残余物的形态和结构表明，PEO/10%DIDOPO/5%MCSW共混物在燃烧过程中比PEO更不稳定。MCSW混合物在燃烧过程中在复合材料表面形成了更致密、更连续的碳层。流变行为表明，PEO/10%DIDOPO/5%MCSW的高复数粘度和模量促进了燃烧过程中凝聚相的交联网络结构。MCSW表现出优异的阻燃性和改善的热稳定性，在消防安全应用中具有潜在的应用前景。
