两种溴阻燃剂对聚乙烯阻燃性能的研究

讨论了十溴二苯醚(DBDPO)和八溴二苯醚(OBDPO)对低密度聚乙烯(LDPE)的阻燃性能和拉伸强度的影响。通过热分析法(DSC)和热重法(TG)比较了DBDPO和OBDPO分解行为的差异。结果表明，DBDPO对LDPE拉伸强度下降的影响比OBDPO大。极限氧指数(LOI)测试表明：Sb2O3能够与溴阻燃剂产生协同作用，显著增强阻燃剂的阻燃性能；DBDPO对LDPE的阻燃性能优于OBDPO；用DBDPO为阻燃剂时，其最佳用量约为12％(质量分数)，DBDPO与Sb2O3的最佳比例是3：1；以OBDPO为阻燃剂时，最佳用量约为16％，与Sb2O3的最佳比例是2．5：1。

Study on the Flame Resistances of the Two Bromine Flame Retardants to Polyethylene

The flame resistances and tensile strengths of decabromodiphenyl oxide (DBDPO) and octabromodiphenyl oxide (OBDPO), to low density polyethylene (LDPE) were researched. The difference in the behaviors of decompositon of DBDPO and OBDPO was compared by differential scanning calorimetry (DSC) and thermogravimetry (TG). Tests on the tensile strength of samples showed that OBDPO had little effect on the tensile strength of LDPE, while DBDPO had a great effect on the decrease of material. Measurements on the limiting oxygen index (LOI) indicated that Sb_2O_3 increased greatly the flame resistance of bromine flame retardant by its synergistic action; the flame resistance of DBDPO to LDPE was better than that of OBDPO; the optimum DBDPO content was about 12%, and the optimum ratio of DBDPO to Sb_2O_3 was 3; however, the optimum OBDPO content was about 16%, and the optimum ratio of OBDPO to Sb_2O_3 was 2.5.