【摘要】 以三对硝基苯氧基三苯氧基环三膦腈和六对硝基苯氧基环三膦腈为主要单体,采用活性硝基亲核取代的方法,合成了一类新的环簇膦腈聚合物。单体和聚合物的结构通过元素分析、IR和1H NMR等方法得到确认,聚合物的性质采用DSC,TGA等方法进行了研究。发现由三对硝基苯氧基三苯氧基环三膦腈制得的聚合物具有较好的网络结构,但是由六对硝基苯氧基环三膦腈制得环簇膦腈聚合物的过程中由于空间位阻的影响,导致最终聚合物存在明显的结构缺陷,但两种聚合物在空气中均具有较高的热稳定性,800℃时残碳率分别为45.1%和43.2%,同时发现膦腈网络结构的完善程度是决定聚合物燃烧性质的决定性因素。更多还原

【Abstract】 Novel phosphazene cyclomatrix network polymers were synthesized via nucleophilic displacement of activated nitro groups of tri (4-nitrophenoxy)tri (phenoxy) cyclotriphosphazene and hexa(p-nitrophenoxy) cyclotriphosphazene with the hydroxyls of bisphenol A. Both the monomers and the polymers were characterized by FTIR, 1H-NMR and elemental analysis measurements and their structures were identified. Thermal properties of the polymers were investigated using dynamic thermogravimetric analysis (TGA) in air. The results demonstrated both the cyclomatrix phosphazene polymers 4 and 6 were of excellent thermal stability and their char yields in air at 800?℃ were 45.1% and 43.2% respectively. According to the phenomena in combustion, the polymer 4 was supposed to be processed with a good flame-retardant property because of its excellent crosslinked structure during pyrolysis or combustion. However, the polymer 6 was on the contrary.更多还原