可逆加成-断裂链转移聚合/点击化学法制备含1,2,3-三氮唑官能团的嵌段聚合物及其静电纺丝  

Synthesis and Electro-spinning of 1,2,3-Triazole Containing Di-block Copolymer via Reverse Addition Fragmentation Chain Transfer Reaction and Click Chemistry

作　　者：吴起[1] 刘和文[1] 

机构地区：[1]中国科学技术大学高分子科学与工程系,合肥230026

出　　处：《应用化学》2010年第2期147-150,共4页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金(50773076)资助项目

摘　　要：通过可逆加成-断裂链转移聚合(RAFT)活性自由基聚合方法制备了聚(苯乙烯-b-对氯亚甲基苯乙烯)(PS-b-PCVB)二嵌段共聚物,其中的氯亚甲基侧基经叠氮化反应后与丙炔醇进行点击(Click)反应,最终得到了含有1,2,3-三氮唑官能团的聚苯乙烯二嵌段共聚物(PS-b-PVBTM),核磁共振谱表征结果证明,PS-b-PCVB中的氯亚甲基完全转变成了1,2,3-三氮唑基团。PS-b-PVBTM在15kV电压下进行静电纺丝,制得具有相分离现象的直径在100nm左右的纤维。在90℃退火后纳米纤维表面变得光滑。红外光谱证明,在加热前后聚合物组成没有明显变化,而XPS结果显示退火后共聚物中C1s振起伴峰降低,说明形成了电子转移络合物;XPS结果还表明,退火后表面张力较低的聚苯乙烯链段在表面富集。The diblock copolymer of styrene and chloromethyl-4-vinyl-benzene（PS-b-PCVB） was obtained by means of reverse addition fragmentation chain transfer reaction（RAFT） living free radical polymerization. The chloromethyl groups in PS-b-PCVB were transformed into azidomethyl groups, and then into 1,2,3-triazol groups via click chemistry. The diblobk copolymer containing 1,2,3-triazol groups （PS-b-PVBTM） was thus obtained. The results from NMR spectra suggested a complete transformation from chloromethyl groups to triazol groups. PS-b-PVBTM in DMF was electro-spun at 15 kV, and nanofibers with obvious phase-separation and diameters of about 100 nm were obtained. The surface of the obtained nanofibers was smoothened after being annealed at 90 ℃. FTIR spectra indicate that the chemical structures of the nanofibers did not change during the thermal annealing process. XPS analysis shows that the shake-up peak of Cls decreased after annealing, which indicated charge transferring. XPS analysis also demonstrates that the low-surface-tension PS block gathered on the surface of the nanofibers after annealing.

关 键 词：点击化学 RAFT 静电纺丝 纳米纤维 

分 类 号：O633[理学—高分子化学]