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采用离子交换法制备了牛磺酸插层水滑石(T-LDH),通过红外光谱(FTIR)和X射线衍射(XRD)对NO3-LDH与T-LDH的结构进行了表征,结果表明牛磺酸成功插层到水滑石层间。通过双螺杆挤出机将NO3-LDH与T-LDH和乙烯-乙酸乙烯共聚物(EVA)熔融共混,采用热重分析(TGA)和锥形量热法(CCT)对EVA复合材料的热稳定性和阻燃性能进行了表征,结果表明T-LDH能进一步提高EVA基体的热稳定性和阻燃性能。分析了LDHs对EVA的阻燃机理:LDHs的吸热分解能有效降低基体的热量,同时释放出的H2O能有效地降低聚合物周围氧气的浓度。EVA/T-LDH形成的较完整炭层与牛磺酸所含的S元素都能更好地提高材料的阻燃性能。
T-LDH was prepared by ion exchange method. The structures of NO3-LDH and T-LDH were characterized by FTIR and XRD. The results showed that the structure of Taurine Acid successfully intercalated into the hydrotalcite layer. NO3-LDH was melt-blended with T-LDH and ethylene-vinyl acetate copolymer (EVA) by a twin-screw extruder. The effects of thermal gravimetric analysis (TGA) and cone calorimetry Stability and flame retardant properties were characterized, the results show that T-LDH can further improve the EVA matrix thermal stability and flame retardant properties. The flame retardant mechanism of LDHs on EVA is analyzed. The endothermic decomposition of LDHs can effectively reduce the heat of the matrix, and the released H2O can effectively reduce the concentration of oxygen around the polymer. The more complete carbon layer formed by EVA / T-LDH and the S element contained in taurine can all improve the flame retardancy of the material.