DOPOHM/丙烯酸树脂复合材料的制备及阻燃性能研究

Preparation and Flame Retardant Performance of DOPOHM/Acrylic Resin Composites

摘要:

采用9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物（DOPO）与甲基丙烯酸-β-羟乙酯（HEMA）反应合成了有机膦阻燃剂——2-甲基-3-(6-氧代-6H-二苯并[c,e][1,2]氧磷杂己环-6-基)丙酸-2-羟乙酯(DOPOHM)，以DOPOHM对丙烯酸树脂进行阻燃，得到阻燃丙烯酸树脂复合材料（DOPOHM/AR）。利用TGA分析仪和极限氧指数（LOI）测定仪测定了复合材料的热稳定性和阻燃性能，用SEM、XPS和EDS研究了复合材料的阻燃机制；通过Horowitz-Metzger理论计算复合材料的分解活化能(Ea)。结果表明：DOPOHM/AR的分解活化能（Ea）随DOPOHM用量的增加而升高，DOPOHM对丙烯酸树脂热降解速率具有抑制作用，DOPOHM的热分解产物聚磷酸盐催化基体成炭，致密的炭层覆盖在材料表面构成热量和分解产物逸散的屏障；当DOPOHM用量占单体总质量的25%时，复合材料的LOI达到26，UL-94测试达V-0级。

Abstract:

In this paper, The flame retardant 2-hydroxyethyl-2-methyl-3-(6-oxido-6H-dibenzo[c,e][1,2]oxaph-osphinin-6-yl)propanoate(DOPOHM) was prepared by 9-Oxa-10-phospha-phenanthr-ene 10-oxide(DOPO)，and the flame retardant composites was prepared using acrylate resin(AR) as matrix and DOPOHM as the flame retardant. The thermal stability and flame retardancy of composites was characterized by TGA and Limit Oxygen Index(LOI), and flame retardancy mechanism was studied by SEM, XPS and EDS. The decomposition activation energy(Ea) of composites was calculated by Horowitz-Metzger theory. The result show that Ea of DOPOHM/AR composites improved as DOPOHM content increased. The DOPOHM exertinhibited effect on thermal degradation of polymer chain, and catalyze matrix formed dense char layer covering the surface of composites to be barrier to prevent heat and decomposition products escaped. The LOI of materials is found to be 26 and class V-0 of UL-94 test is passed when DOPOHM content is 25 wt%.