表面接枝磷杂菲的二氧化钛制备及对聚氨酯阻燃性能影响  

Preparation of DOPO-Immobilized Titanium Dioxide Nanoparticles and Its Improvement of Flame Retardancy of Polyurethane

作　　者：董全霄 张素丽[2] 陈柯羽 孙诗兵[2] 谢永江[3] 郑新国[3] 李书明[3] 程冠之[3] Quanxiao Dong;Suli Zhang;Keyu Chen;Shibing Sun;Yongjiang Xie;inguoZheng;Shuming Li;Guanzhi Cheng(Railway Technology Research Colloge,China Academy of Railway Sciences,Beijing 100081,China;College of Materials Science and Engineering,Beijing University of Technology,Beijing 100124,China;Railway Engineering Research Institute,China Academy of Railway Sciences,Beijing 100081,China)

机构地区：[1]中国铁道科学研究院研修学院,北京100081 [2]北京工业大学材料科学与工程学院,北京100124 [3]中国铁道科学研究院铁道建筑研究所,北京100081

出　　处：《高分子材料科学与工程》2019年第7期38-43,共6页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(21504003);中国铁道科学院基金项目(2016YJ024,2016YJ034)

摘　　要：在超临界二氧化碳中制备了表面接枝磷杂菲的纳米二氧化钛(TiO2-g-DOPO),用红外光谱、紫外光谱、热重分析等表征了所得纳米粒子的结构。将TiO2-g-DOPO加入聚氨酯中,用锥形量热仪测试材料的阻燃性能,发现向聚氨酯中加入TiO2-g-DOPO后,材料的热释放速率和总热释放量均降低。用扫描电子显微镜观察材料燃烧后生成的炭层结构,发现向聚氨酯中加入TiO2-g-DOPO材料燃烧生成的炭层较纯聚氨酯燃烧生成的炭层更致密。用Ozawa法研究了材料的降解动力学,发现加入TiO2-g-DOPO后聚氨酯材料的初期和后期的降解活化能提高。9,10-Dihydro-9-oxa-10-phosphaphenanthrene-10-oxide(DOPO)was immobilized onto the surface of titanium dioxide(TiO2)nanoparticles in supercritical carbon dioxide.The DOPO immobilized TiO2 was characterized by UV-visible spectroscopy,magic angle spinning nuclear magnetic resonance and thermogravimetric analysis.Cone calorimeter was used to characterize the flame retardancy properties.By incorporating the DOPO-immobilized TiO2 nanoparticles(TiO2-g-DOPO)(5%)into the polyurethane matrix,the heat release rate and total heat release decrease.SEM observation were performed on the combustion residue chars after cone calorimeter test.It is found the char layer is compact for polyurethane with TiO2-g-DOPO.Apparent activation energies of the polymer composites were estimated via Ozawa method.It is found that the incorporation of TiO2-g-DOPO improves activation energies.Based on the results,it is speculated that TiO2-g-DOPO could inhibit the degradation of polyurethane and catalyze the formation of carbonaceous char on the surface.Thus,flame retardancy properties of polyurethane are improved.

关 键 词：聚氨酯 二氧化钛 磷杂菲 阻燃 降解 

分 类 号：TQ334.1[化学工程—橡胶工业]