氢氧化铝改性苯并恶嗪及阻燃性的研究-IngentaConnect.PDF

5 Modification of Benzoxazine w ith Aluminum Hydroxide and Flame Retardancy Improvement , , ( , 61 65) LING Hong, YE Xiao-zhou, GU Yi ( College of Polymer Science and Engineering, Sichuan University, Chengdu 61 65, China) : ( AT H) ( BOZ) , , 2 % , UL-94V ( DSC) ( DMA) , , (T GA) ( SEM) , , , , , , : ; ; : T Q322.4 : A : 1 1-4381( 2 11) 6- 5- 6 Abstract: Benzoxazine ( BOZ) / aluminum hydroxide( A TH) castings w ere prepared, and the proper- ties of polybenzoxazine w ere investigated. The results show that w hen the mass fraction of aluminum hydroxide is more than 2 % , flame retardancy of polybenzoxazine/ ATH can achieve the U L-94V grade. Differential scanning calorimetry ( DSC) and dynamic mechanical analysis ( DMA ) test show that w ith aluminum hydroxide the exothermal enthalpy of ring-opening curing reaction of benzoxazine decreases apparently and the glass transition temperature of the polybenzoxzine slightly increased. Thermal gravimetric analysis ( TGA) and scanning electron microscopy ( SEM) test results show that w hen heated above 2 , the endothermic decomposition of aluminum hydroxide w ith w ater release to enable the polybenzoxazine to low er the temperature and to higher char yield, and aluminum oxide generated over the polybenzoxazine carbon surface isolated air to prevent combustion. Key words: benzoxazine; flame retardant; aluminum hydroxide , , , , , , :