Improving the Flame Retardancy of Polybenzoxazines with a Reactive Phosphorus-Containing Compound
Improving the Flame Retardancy of Polybenzoxazines with a Reactive Phosphorus-Containing Compound
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DOI：
10.1080/00222348.2011.563197
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发表时间：
2011-07
期刊：
影响因子：
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通讯作者：
Hong Ling;Yi Gu
中科院分区：
文献类型：
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作者：
Hong Ling;Yi Gu
通过用反应性含磷化合物 2-(6-Oxido-6H-二苯并[c,e][1,2]氧杂膦-6-基)1,4-苯二酚 (ODOPB) 改性苯并恶嗪制备了一种新型阻燃树脂。通过差示扫描量热法研究了含 ODOPB 的苯并恶嗪（ODOPB-BOZ）和一种双官能苯并恶嗪（B-BOZ）的固化反应。与 B-BOZ 相比，ODOPB-BOZ 前体表现出较低的固化温度。通过动态力学分析测试发现，固化后的ODOPB-BOZ的玻璃化转变温度和储能模量均低于固化后的B-BOZ。此外，固化的ODOPB-BOZ的拉伸和弯曲性能也低于固化的B-BOZ。 TGA测试证明，由于ODOPB的存在，聚苯并恶嗪的成炭率显着提高，同时高温分解率降低。结果发现，固化的ODOPB-BOZ在UL-94测试中的阻燃性达到V-0级，而固化的B-BOZ的阻燃性为V-1级。 SEM图像显示，固化后的ODOPB-BOZ燃烧后形成了更致密的炭层，从而提高了阻燃性。
A novel flame retardant resin was prepared by modifying benzoxazines with a reactive phosphorus-containing compound, 2-(6-Oxido-6H-dibenzo[c,e][1,2]oxa-phosphorin-6-yl) 1,4-benzenediol (ODOPB). The curing reactions of the benzoxazines containing ODOPB (ODOPB-BOZ) and a type of bifunctional benzoxazine (B-BOZ) were investigated via differential scanning calorimetry. The ODOPB-BOZ precursors exhibited lower curing temperature in comparison with the B-BOZ. Through dynamic mechanical analysis tests, it was found that the glass transition temperature and storage modulus of the cured ODOPB-BOZ were lower than those of the cured B-BOZ. Moreover, the tensile and flexural properties of the cured ODOPB-BOZ were also lower than those of the cured B-BOZ. The TGA tests proved that, owing to the presence of ODOPB, the char yield of the polybenzoxazines were remarkably raised while the decomposition rates at higher temperature were reduced. It was found that the flame retardancy of cured ODOPB-BOZ attained V-0 grade upon the UL-94 tests while that of cured B-BOZ was V-1 grade. SEM images showed that more compact char layers were formed in the cured ODOPB-BOZ after combustion, resulting in the improvement of flame retardance.