纳米KH颗粒的热稳定性及其化学反应活性(英文)

Thermal Stability of Nano-KH Particles and Their Chemical Reactivities

考察了纳米尺寸的KH颗粒在不同温度热处理后比表面积的变化及其与化学反应活性之间的关系.纳米KH热处理后,比表面积随着热处理温度升高而减小,但单位表面的化学反应活性却增大.表明热处理改变了KH表面的状态,说明大的比表面积是构成纳米KH高活性的一个主要原因,而具有高表面能的表面也是高活性的一个重要因素.纳米KH具有使苯乙烯快速聚合的催化作用.

The variation of specific surface area and chemical reactivity of nano-KH particles treated at different temperatures has been studied, The BET surface area of nano-KH decreases with the increase of heat treatment temperature, while the chemical reactivity per unit surface increases steadily. These results indicate that the state of KH surface is changed after heat treatment. Large specific surface area of nano-KH is a major factor for its high chemical reactivity, nevertheless, the surface in an activated state with high surface energy is also an important factor for its high chemical reactivity. Nano-KH alone can polymerize styrene rapidly with the formation of polystyrene.