Aggregation Behaviors of PEO-PPO-ph-PPO-PEO and PPO-PEO-ph-PEO-PPO at an Air/Water Interface: Experimental Study and Molecular Dynamics Simulation

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• 作者：Houjian Gong ; Guiying Xu ; Teng Liu ; Long Xu ; Xueru Zhai ; Jian Zhang ; Xin Lv
• 刊名：Langmuir
• 出版年：2012
• 出版时间：September 25, 2012
• 年：2012
• 卷：28
• 期：38
• 页码：13590-13600
• 全文大小：708K
• 年卷期：v.28,no.38(September 25, 2012)
• ISSN：1520-5827

文摘

The block polyethers PEO-PPO-ph-PPO-PEO (BPE) and PPO-PEO-ph-PEO-PPO (BEP) are synthesized by anionic polymerization using bisphenol A as initiator. Compared with Pluronic P123, the aggregation behaviors of BPE and BEP at an air/water interface are investigated by the surface tension and dilational viscoelasticity. The molecular construction can influence the efficiency and effectiveness of block polyethers in decreasing surface tension. BPE has the most efficient ability to decrease surface tension of water among the three block polyethers. The maximum surface excess concentration (螕_max) of BPE is larger than that of BEP or P123. Moreover, the dilational modulus of BPE is almost the same as that of P123, but much larger than that of BEP. The molecular dynamics simulation provides the conformational variations of block polyethers at the air/water interface.