异恶唑啉基多孔聚合物的制备及其对有机溶剂的吸附性能

Preparation of Isoxazoline-based Porous Polymers and their Adsorption Capacity for Organic Solvents

以原位生成的腈氧化物和聚丁二烯为原料通过无催化点击聚合制备出一种新型异恶唑啉基聚合物,通过冷冻干燥和超临界干燥对聚合物进行干燥处理,获得2种异恶唑啉基多孔聚合物。两种干燥方式均可得到三维网状结构,超临界干燥后的多孔聚合物为纳米孔结构,冷冻干燥的多孔聚合物兼具微米和纳米孔结构;超临界干燥处理的多孔聚合物具有更好的热稳定性,经超临界干燥和冷冻干燥得到的多孔聚合物的热分解温度分别为204℃和180℃;相较于超临界干燥的多孔聚合物,冷冻干燥处理的多孔聚合物对有机溶剂具有更强的吸附能力,但平衡时间更长;冷冻干燥后的多孔聚合物具有更好的循环使用性能,经10次吸附-脱附后仍与首次吸附量持平。

A novel isoxazoline-based polymer was first prepared via catalyst-free click polymerization using in-situ generated nitrile oxide and polybutadiene as raw materials. Subsequently,the polymer was dried by freeze drying and supercritical drying respectively to obtain two kinds of isoxazoline-based porous polymers. The three-dimensional network structure could be obtained by both drying methods. The porous polymer after supercritical drying has a nanoporous structure,while the freeze-dried porous polymer has both microporous and nanoporous structures. The supercritically-dried porous polymer has better thermal stability,and the thermal decomposition temperatures of the porous polymer obtained by supercritical drying and freeze drying were 204 ℃ and 180 ℃,respectively. Compared with the porous polymer after supercritical drying,the freeze-dried porous polymer has stronger adsorption capacity for organic solvents,but the equilibrium time is longer. In addition,the freeze-dried porous polymer possesses better recycling performance,and the adsorption capacity after 10 cycles is still close to that at the first adsorption.