通过氧指数、垂直燃烧、热失重、锥形量热和电镜扫描等研究了由双酚 A 双(磷酸二苯酯)(BDP)与聚磷酸铵(APP)组成的膨胀型阻燃剂对环氧树脂的阻燃性能和阻燃机理。结果表明,BDP/APP 膨胀型阻燃剂对环氧树脂有较好的阻燃性能,使环氧树脂...通过氧指数、垂直燃烧、热失重、锥形量热和电镜扫描等研究了由双酚 A 双(磷酸二苯酯)(BDP)与聚磷酸铵(APP)组成的膨胀型阻燃剂对环氧树脂的阻燃性能和阻燃机理。结果表明,BDP/APP 膨胀型阻燃剂对环氧树脂有较好的阻燃性能,使环氧树脂氧指数达到29.9%,垂直燃烧通过 UL94 V-0级,500℃残炭量达到34 8%,平均热释放速率下降70.7%,热释放速率峰值下降67.3%,有效燃烧热平均值下降24.1%。扫描电镜分析表明,经膨胀阻燃剂阻燃的环氧树脂燃烧后能够形成连续、致密、封闭、坚硬的焦化炭层。展开更多
The two flame retardants of 3a and 3b are synthesized from neopentyl alcohol,phospous oxychloride,1,3-dihydroxybenzene and bisphenol-A by a facile and useful method with the yields of 75.2% and 89.7%.respectively.The ...The two flame retardants of 3a and 3b are synthesized from neopentyl alcohol,phospous oxychloride,1,3-dihydroxybenzene and bisphenol-A by a facile and useful method with the yields of 75.2% and 89.7%.respectively.The structures of the two flame retardants are identified and studied by FT-IR,1H NMR,ESIMS and elementary analysis.Reaction conditions are also optimived.The results of thermal analysis show that they have high thermal stability and excellent char-forming ability.Decomposition temperatures of compound 3a and 3b are 312.36 ℃ and 306.39 ℃,respectively.Residual carbons(w%) of compound 3a and 3b under 500 ℃ are 49%and 32%,respectively.展开更多
5,5-Dibromomethyl-2-chloro-2-oxo-1,3,2-dioxaphosphorinane)(Ⅱ)was prepared by reaction of dibromoneopentyl glycol and phospous oxychloride in the presence of triethylamine.Then bis(5,5-dibromomethyl-1,3,2-dioxanephosp...5,5-Dibromomethyl-2-chloro-2-oxo-1,3,2-dioxaphosphorinane)(Ⅱ)was prepared by reaction of dibromoneopentyl glycol and phospous oxychloride in the presence of triethylamine.Then bis(5,5-dibromomethyl-1,3,2-dioxanephosphoryl)bisphenol A(Ⅲ)was synthesized by compound Ⅱ and bisphenol A.The overall yield was 78.8%.The structure of the novel flame retardant was confirmed by elementary analysis,IR,MS and 1H NMR spectroscopy.The termogravimetry showed that the novel flame retardant had high thermal stability and excellent char-forming ability.The beginning temperature of the compound Ⅲ decomposition was above 264.2 ℃,and the char yield was about 17.50% at 600 ℃.展开更多
文摘The two flame retardants of 3a and 3b are synthesized from neopentyl alcohol,phospous oxychloride,1,3-dihydroxybenzene and bisphenol-A by a facile and useful method with the yields of 75.2% and 89.7%.respectively.The structures of the two flame retardants are identified and studied by FT-IR,1H NMR,ESIMS and elementary analysis.Reaction conditions are also optimived.The results of thermal analysis show that they have high thermal stability and excellent char-forming ability.Decomposition temperatures of compound 3a and 3b are 312.36 ℃ and 306.39 ℃,respectively.Residual carbons(w%) of compound 3a and 3b under 500 ℃ are 49%and 32%,respectively.
文摘5,5-Dibromomethyl-2-chloro-2-oxo-1,3,2-dioxaphosphorinane)(Ⅱ)was prepared by reaction of dibromoneopentyl glycol and phospous oxychloride in the presence of triethylamine.Then bis(5,5-dibromomethyl-1,3,2-dioxanephosphoryl)bisphenol A(Ⅲ)was synthesized by compound Ⅱ and bisphenol A.The overall yield was 78.8%.The structure of the novel flame retardant was confirmed by elementary analysis,IR,MS and 1H NMR spectroscopy.The termogravimetry showed that the novel flame retardant had high thermal stability and excellent char-forming ability.The beginning temperature of the compound Ⅲ decomposition was above 264.2 ℃,and the char yield was about 17.50% at 600 ℃.
