苯酚对Pluronic嵌段共聚物F127胶束化以及胶束增溶蒽的影响

通过紫外 -可见光谱、荧光光谱和黏度等技术测定在苯酚存在下 ,Pluronic嵌段共聚物F12 7水溶液的临界胶束浓度 (CMC)以及胶束结构的变化 ,考察苯酚浓度cph对胶束增溶蒽的影响。实验结果发现F12 7的CMC随cph的增高先增大 ,在cph>3 0× 10 -6 后减小 ,胶束特性黏度[η]则先减小再增大 ,胶束内核中PO成分逐渐增大 ,在cph>3 0× 10 -6 后胶束内核几乎完全由PO构成。蒽与胶束的K1/N值先急剧下降 ,同样在cph>3 0× 10 -6 后转而逐渐增大。结合苯酚对水结构的影响 ,以及与PEO嵌段上醚氧原子的氢键相互作用解释了上述实验现象。

Effect of Phenol on Micellization of Pluronic Block Copolymer F127 and Solubilization of Anthracene in the Micelle

The critical micelle concentration (CMC) of Pluronic block copolymer F127 in aqueous solutions and the micellar structure are determined by UV and fluorescence spectroscopy as well as viscosity technology in the presence of phenol.The results show that the CMC is enhanced with increasing phenol concentration ( c ph ) at initial stage and reaches a maximum at c ph =30×10 -6 .The intrinsic viscosity displays opposite trend of decrease with initial addition of phenol and then increases at c ph >30×10 -6 .The PO component in the micellar core is gradually increased when phenol is added and reaches 100% at c ph >30×10 -6 .The value of K 1/ N on interaction between anthracene and the micelle appears a decrease with initial addition of phenol and then gradually increases at c ph >30×10 -6 .The results are interpreted according to phenol promoting the formation of water structure and bonding of phenol hydrogen to PEO block.