聚丙烯中丙烯酸酯的液-固扩散行为

Liquid-solid diffusion behavior of acrylate in polypropylene

小分子单体丙烯酸甲酯(MA)、丙烯酸乙酯(EA)、丙烯酸丁酯(BA)通过液-固扩散从聚丙烯(PP)粒子表面扩散至内部,研究了溶胀温度、溶胀时间、单体浓度和超声波作用对上述单体扩散速率的影响。结果表明,PP粒子表面存在的微孔,内部大量疏松结构和非晶区,为丙烯酸酯的扩散-吸附提供了通道和场所;相同条件下EA的扩散速率最快,增加单体浓度和超声波作用均有利于提高单体的扩散速率。

In this paper, small molecular monomers such as MA, EA, BA were diffused into the interior section of polypropylene （PP） particle from their surface by liquid-solid diffusion. The effect of swelling temperature, swelling time, monomer concentration and ultrasonic on the diffusion rate of the above monomers was studied. The results showed that the micropores presented on the surface of PP, a large amount loose structures and amorphous region in its inside had provided passages and places for the diffusion-adsorption of the acrylate. The diffusion rate of EA was the fastest in the same conditions. The both increasing monomer concentration and ultrasonic were beneficial for the increase of diffusion rate.