共聚原甲基丙烯酸酯系吸附功能树脂合成及其性能研究

Research on the Properties of Absorption Functional Resin Synthesized by the Copolymerization of Methacrylates

采用悬浮聚合法合成了LMA(甲基丙烯酸十二酯)均聚树脂、BMA(甲基丙烯酸正丁酯)/LMA共聚树脂、BMA/HEMA(甲基丙烯酸β羟乙酯)共聚树脂、BMA/DVB(二乙烯基苯)共聚树脂以及BMA/HEMA/LMA共聚树脂。研究了单体种类、交联剂种类以及用量与树脂吸附性能、交联密度间的关系,利用FT-IR对树脂试样的化学结构进行了表征。结果表明,与LMA均聚物相比,BMA被引入大分子主链后,BMA/LMA共聚树脂对煤油的吸附量大大降低,对甲苯和三氯乙烯的吸附量增大,而BMA/LMA/HEMA共聚树脂对煤油、甲苯和三氯乙烯的吸附量均有所下降;化学交联型树脂的吸附量随时间变化较小,物理交联型树脂其吸附量随时间变化较为明显;物理交联剂HEMA的质量分数影响树脂的三维网状结构,进而影响树脂的吸附性能;树脂大分子间存在氢键作用,有利于物理交联结构的形成,长侧链LMA结构单元的引入,促使侧链间发生缠结甚至结晶,进一步增强了物理交联结构。

LMA homopolymer, BMA/LMA copolymer, BMA/HEMA copolymer, BMA/DVB copolymer and BMA/HEMA/LMA copolymer were synthesized by suspension polymerization. The influences of varieties of monomers and crosslinking agents, along with dosage of crosslinking agents on absorptive property and crosslinking density of resin were investigated. Chemical structure of samples was characterized by FT-IR. The results show that compared with LMA homopolymer, kerosene absorbency of BMA/LMA copolymer decreases while absorbencies for toluene and trichloroethylene increase after introducing BMA into main chain; for BMA/LMA/HEMA copolymer, absorbencies for kerosene, toluene and trichloroethylene decrease after introducing BMA into main chain. Absorbency of chemical crosslinking resin changes slightly, but the absorbency of physical crosslinking resin changes obviously with increasing absorptive time. The mass fraction of HEMA can affect absorptive property due to its effect on three dimensional network structure of the resin. Hydrogen bonding interactions exist and are beneficial to forming physical crosslinking structure, LMA structural units can promote entanglement and crystallization of side chain as LMA is introduced into main chain, which can further strengthen the physical crosslinking structure.