羧基氟碳共聚物纤维光催化剂载体的制备与耐光降解

通过溶液聚合法合成了聚(丙烯酸六氟丁酯-co-甲基丙烯酸)(P(HFBA-co-MAA))和聚(甲基丙烯酸十二氟庚酯-co-甲基丙烯酸)(P(DFHMA-co-MAA))羧基氟碳共聚物. 静电纺丝实验结果表明,随着 MAA 用量的减少,两种氟碳共聚物的可纺性逐渐变差,相应的纺丝液的浓度也逐渐降低,所用溶剂的极性和沸点呈现降低的趋势;当配制纺丝液所用低沸点溶剂丁酮用量增大时,所得纤维的直径呈增加趋势;P(DFHMA-co-MAA) 的可纺性优于 P(HFBA-co-MAA). 采用两步法在 P(DFHMA-co-MAA)共聚物纤维表面制备光催化剂 ZnS,XPS 结果表明锌离子先与共聚物纤维表面的羧酸根离子络合,然后络合的锌离子再与硫源 TAA 反应形成 ZnS. MAA 用量高的共聚物纤维表面形成的 ZnS 量与粒子尺寸较大,MAA 用量为 10 wt% 时,共聚物纤维表面形成了纳米级的 ZnS 粒子,通过紫外降解实验和红外分析表明制备的 ZnS/P(DFHMA-co-MAA)纤维复合物具有很好的耐紫外光降解性能.

PREPARATION OF CARBOXYLIC FLUOROCARBON POLYMER FIBERS USED AS PHOTOCATALYST CARRIER

The carboxylic fluorocarbon polymer poly(hexafluorobutyl acrylate-co-methacrylic acid)(P(HFBA-co-MAA)) and poly(dodecafluoroheptyl methacrylate-co-methacrylic acid)(P(DFHMA-co-MAA)) were prepared by solution polymerization.The electrospinning experiments showed that when the amount of MMA in copolymers decreased the spinnability of P(DFHMA-co-MAA) and P(HFBA-co-MAA) copolymers became worse,at the same time the concentration of two coplymers solution decreased,and the polarity and boiling point of solvent gradually reduced; the diameter of fibers enlarged with increasing the amount of butanone in the spinning solvent; the spinnability of P(DFHMA-co-MAA) was better than that of P(HFBA-co-MAA).Using P(DFHMA-co-MAA) fibers as carrier,photocatalyst ZnS were prepared on the surface of fibers by a two-step method.The XPS results showed that Zn2+ were introduced onto the surface of fibers by coordinating with the carboxyl of fluoropolymer first,then coordinated Zn2+ reacted with S2- provided by thioacetamide to form ZnS.The amount and particle size of ZnS increased with increasing the proportion of MAA in the copolymer.Nano dimension ZnS particles could be obtained when the proportion of MAA in the copolymer was 10 wt%.The photodegradation and FTIR analysis showed that the as prepared ZnS/P(DFHMA-co-MAA) fiber composites had good stability under UV irradiation.