表面原位化学组合改性Al(OH)_3粉体的机理研究

Mechanism of Surface In-Situ Chemical Composite Modification on Al(OH)_3 Powder

采用表面原位化学组合的方法,在Al(OH)3表面分批结合上甲苯二异氰酸酯(TDI)、烷基酚醛树脂(PF)、丁腈橡胶(NBR)等几种改性剂,形成极性逐渐过渡的梯度界面层。电镜分析表明,Al(OH)3颗粒的平均粒径随改性剂种类的增加依次减小。通过红外光谱、热分析证明了改性剂在Al(OH)3的表面原位形成多层化学键合结构,得到“硬核-软壳”结构的粒子,从而提出表面原位化学组合改性Al(OH)3粉体的微观相界面模型,解释了表面原位化学组合方法改性Al(OH)3填充PVC复合材料具有良好力学性能的原因。

The surface of Al（OH）3 powder was bonded in sequence with tolylene diisocyanate （TDI）, alkyl phenolic-formaldehyde resin（PF）, and acrylonitrile-butadiene rubber（NBR） to generate a gradient interface with increasing polarity. SEM showed that the average granule size of particle reduced gradually with the bonding steps. Infrared spectrum （IR）, thermogravimetry analysis （TG）, and differential scanning calorimetry （DSC） confirmed that TDI, PF, and NI3R were attached to the surface of Al（OH）3 leading to a ＂hard core-soft shell＂ structure. A model for the multi-interface structure was proposed, which explained the mechanism of the toughening of PVC by such particles.