交联结构对苯类吸收树脂性能的影响

Effect of crosslinking structure on properties of absorbent resins for benzene series

采用悬浮聚合法制备了球形苯类吸收树脂,研究了交联剂用量与树脂的吸收倍率、交联密度和凝胶分数之间的关系,探讨了交联结构对树脂吸收和释放动力学的影响,并采用扫描电镜考察了树脂的微观形貌。结果表明:随着交联剂用量的增加,吸收树脂的凝胶分数和交联密度不断增大,吸收倍率出现峰值;随着交联密度的提高,吸收树脂对甲苯的吸收速率和释放速率均减慢,吸收动力学常数与释放扩散系数都不断降低;树脂对甲苯的吸收动力学过程符合准一级动力学方程;得出了形式简洁的吸收树脂释放动力学方程,能够很好地描述吸收树脂释放甲苯的动力学行为;吸收树脂的交联结构稳定,再生重复使用10次以后树脂微球的大小、形貌和吸收倍率均无明显变化。

Spherical absorbent resins for benzene series were synthesized by suspension polymerization. The dependence of absorbency, crosslinking density and gel fraction of resins on crosslinker dosage was studied. The effects of crosslinking structure on absorption kinetics and release kinetics were investigated. Scanning electron microscope was used to observe the morphology of the resins. Gel fraction and crosslinking density kept increasing while a peak absorbency was observed with increasing crosslinker dosage. With the increase of crosslinking density, absorption rate and release rate of the resin for toluene reduced gradually, and absorption kinetic constant and diffusion coefficient decreased. Absorption kinetics of the resin for toluene fitted the quasi first order equation. A simple release kinetics equation was obtained, by which the release behavior could be well described. Crosslinking structure of the resin was stable. The size, morphology and absorbency of the spherical absorbent resin did not change obviously after 10 times recycle and reuse.