Results 221 to 230 of about 26,977 (261)

Characterization of a PEO-PPO-PEO block copolymer system

2008
The investigated EO27-PO39-EO27 triblock copolymer, Pluronics P-85, is a nonionic surface-active agent which has a monomeric molecular weight of 4600, of which 500% corresponds to the PEO component. P-85 exist in complex states of aggregation in aqueous solution.
K. Schillén, O. Glatter, W. Brown
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Adsorption of PEO-PPO-PEO block copolymers at silica

Macromolecules, 1992
It is found that block PEO-PPO-PEO copolymers adsorb at silica in much the same way as a PEO homopolymer of a comparable molecular weight, independent of the PO content in the range of 0-30%. The pH dependence is similar to that displayed by PEO. Good agreement is found between the ellipsometry experiments and the experiments on colloidal silica ...
Cosgrove, T, Malmsten, M, Linse, P
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Micellar Dynamics in Aqueous Solutions of PEO−PPO−PEO Block Copolymers

Langmuir, 1997
The dynamics of poly(ethylene oxide)−poly(propylene oxide)−poly(ethylene oxide) micelle rearrangements were studied using iodine laser temperature jump experiments with light-scattering detection. Two relaxation processes were detected:  the first, fast one was accompanied by an increase in scattered light intensity, while the second, slow process was ...
Goldmints, I., Holzwarth, J., Smith, K., Hatton, T.   +3 more
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Effect of PEO molecular weight on the miscibility and dynamics in epoxy/PEO blends

The European Physical Journal E, 2015
In this work, the effect of poly(ethylene oxide) (PEO) molecular weight in blends of epoxy (ER) and PEO on the miscibility, inter-chain weak interactions and local dynamics were systematically investigated by multi-frequency temperature modulation DSC and solid-state NMR techniques.
Shoudong, Lu, Rongchun, Zhang, Xiaoliang, Wang, Pingchuan, Sun, Weifeng, Lv, Qingjie, Liu, Ninghong, Jia   +6 more
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Rheological and Thermodynamic Properties of PEO-PPE-PEO and PAA-g-PEO-PPO-PEO System

2003
Rheological and thermodynamic properties of Pluronic F127 copolymer and Pluronic-g-PAA have been studied as a function of temperature and concentration. A combination of rheometry and DSC was employed to examine the gelation behavior of F127 and F127-g-PAA.
Tian, Y., Dai, S., Tam, Michael K. C., Bromberg, Lev, Hatton, T. Alan   +4 more
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Alginate/PEO-PPO-PEO Composite Hydrogels with Thermally-Active Plasticity

Biomacromolecules, 2013
Stimuli-responsive hydrogels with high strength and toughness have received significant interest in recent years. Here, we report thermally active composite hydrogels comprising alginate and one of two poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) triblock copolymers.
Joseph C, White, Erika M, Saffer, Surita R, Bhatia   +2 more
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Molecular interactions between PEO–PPO–PEO and PPO–PEO–PPO triblock copolymers in aqueous solution

Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2015
Abstract The molecular interactions between Pluronic F127 (PEO100–PPO65–PEO100) and Pluronic-R 25R4 (PPO19–PEO33–PPO19) in aqueous solution have been studied using micro thermal analysis and rheology, where PEO and PPO stand for poly(ethylene oxide) and poly(propylene oxide) blocks respectively through a complete thermal cycle from heating to cooling.
Sijun Liu, Lin Li
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Phase Behavior and Lubricity of Aqueous PEO-PPO-PEO and PPO-PEO-PPO Triblock Copolymer Solutions

Tribology Transactions, 2016
ABSTRACTAqueous triblock copolymer solutions are potential low-cost, eco-friendly lubricants. However, as a solution, their phase changes with copolymer concentration and solution temperature, raising the question, “Does the phase change affect the formation of adsorbed layer and the lubrication performance?” This article studies the copolymer solution
Taheri, Reza, Kosasih, Buyung, Zhu, Hongtao, Tieu, Anh Kiet   +3 more
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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

Langmuir, 2012
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.
Houjian, Gong, Guiying, Xu, Teng, Liu, Long, Xu, Xueru, Zhai, Jian, Zhang, Xin, Lv   +6 more
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Interaction between PEO–PPO–PEO Copolymers and a Hexapeptide in Aqueous Solutions

Langmuir, 2012
Interaction between PEO-PPO-PEO copolymers and a hexapeptide, growth hormone releasing peptide-6 (GHRP-6), was investigated by NMR to study the potential use of the copolymers in peptide drug delivery. (1)H NMR and nuclear Overhauser effect spectroscopy (NOESY) measurements determined that PO methyl protons interacted with methyl protons of the Ala ...
Lianwei, Jia, Chen, Guo, Junfeng, Xiang, Ning, Wang, Liangrong, Yang, Yalin, Tang, Huizhou, Liu   +6 more
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