title: 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.
abstract: 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 (Γ(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.
authors.affiliation: Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan 250100, P. R. China.
authors.forename: Houjian
authors.initials: H
authors.lastname: Gong
authors.forename: Guiying
authors.initials: G
authors.lastname: Xu
authors.forename: Teng
authors.initials: T
authors.lastname: Liu
authors.forename: Long
authors.initials: L
authors.lastname: Xu
authors.forename: Xueru
authors.initials: X
authors.lastname: Zhai
authors.forename: Jian
authors.initials: J
authors.lastname: Zhang
authors.forename: Xin
authors.initials: X
authors.lastname: Lv
mesh_terms: D000388:Air; D001559:Benzhydryl Compounds / Q000737:chemistry; D056004:Molecular Dynamics Simulation; D010636:Phenols / Q000737:chemistry; D011060:Poloxalene / Q000737:chemistry; D011092:Polyethylene Glycols / Q000138:chemical synthesis* / Q000737:chemistry; D058105:Polymerization; D013500:Surface Tension; D014867:Water / Q000737:chemistry*; D000098826:Bisphenol A Compounds
chemical_list: D001559:Benzhydryl Compounds; D010636:Phenols; D011060:Poloxalene; D011092:Polyethylene Glycols; D014867:Water; C464484:pluronic block copolymer P123; C006780:bisphenol A; D000098826:Bisphenol A Compounds