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Bhendale M, Srivastava A, Singh JK. Insights into the Phase Diagram of Pluronic L64 Using Coarse-Grained Molecular Dynamics Simulations. J Phys Chem B 2022; 126:4731-4744. [PMID: 35708274 DOI: 10.1021/acs.jpcb.2c02429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We investigate the concentration-dependent phase diagram of pluronic L64 in aqueous media at 300 and 320 K using coarse-grained (CG) molecular dynamics (MD) simulations. The CG model is derived by adapting the Martini model for nonbonded interactions along with the Boltzmann inversion (BI) of bonded interactions from all-atom (AA) simulations. Our derived CG model successfully captures the experimentally observed micellar-, hexagonal-, lamellar-, and polymer-rich solution phase. The end-to-end distance reveals the conformational change from an open-chain structure in the micellar phase to a folded-chain structure in the lamellar phase, increasing the orientational order. An increase in temperature leads to expulsion of water molecules from the L64 moiety, suggesting an increase in L64 hydrophobicity. Thermodynamic analysis using the two-phase thermodynamics (2PT) method suggests the entropy of the system decreases with increasing L64 concentration and the decrease in free energy (F) with temperature is mainly driven by the entropic factor (-TS). Further, the increase in aggregation number at lower concentrations and self-assembly at very high concentrations is energetically driven, whereas the change from the micellar phase to the lamellar phase with increasing L64 concentration is entropically driven. Our model provides molecular insights into L64 phases which can be further explored to design functionality-based suprastructures for drug delivery and tissue engineering applications.
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Affiliation(s)
- Mangesh Bhendale
- Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208016, India
| | - Arpita Srivastava
- Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208016, India
| | - Jayant K Singh
- Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208016, India.,Prescience Insilico Private Limited, Fifth Floor, Novel MSR Building, Marathahalli, Bengaluru, Karnataka 560037, India
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2
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Shoyama K, Yamaguchi S, Ogawa S, Takamuku T, Kawakita H, Ohto K, Morisada S. Poly(N-isopropylacrylamide) copolymer nanogels with thermogelling ability prepared by a single step of dispersion polymerization. ADV POWDER TECHNOL 2022. [DOI: 10.1016/j.apt.2022.103553] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
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3
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Landazuri G, Fernandez V, Soltero J, Rharbi Y. Length of the Core Forming Block Effect on Fusion and Fission Dynamics at Equilibrium in PEO–PPO–PEO Triblock Copolymer Micelles in the Spherical Regime. Macromolecules 2021. [DOI: 10.1021/acs.macromol.0c01520] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- G. Landazuri
- Université Grenoble Alpes—LRP, F-38041 Grenoble, France
- CNRS, LRP, F-38041 Grenoble, France
- Departamento de Ingeniería Química, CUCEI, Universidad de Guadalajara, Blvd. M. García Barragán # 1421, Guadalajara, Jalisco 44430, Mexico
| | - V.V.A. Fernandez
- Université Grenoble Alpes—LRP, F-38041 Grenoble, France
- CNRS, LRP, F-38041 Grenoble, France
- Departamento de Ciencias Tecnológicas, Universidad de Guadalajara, Av. Universidad No. 1115, Ocotlán, Jalisco 47820, Mexico
| | - J.F.A. Soltero
- Université Grenoble Alpes—LRP, F-38041 Grenoble, France
- CNRS, LRP, F-38041 Grenoble, France
- Departamento de Ingeniería Química, CUCEI, Universidad de Guadalajara, Blvd. M. García Barragán # 1421, Guadalajara, Jalisco 44430, Mexico
| | - Y. Rharbi
- Université Grenoble Alpes—LRP, F-38041 Grenoble, France
- CNRS, LRP, F-38041 Grenoble, France
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Ta TD, Tieu AK, Tran BH. Hydroxyl Influence on Adsorption and Lubrication of an Ultrathin Aqueous Triblock Copolymer Lubricant. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:1465-1479. [PMID: 33476165 DOI: 10.1021/acs.langmuir.0c02987] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
This research aims to provide insights into the adsorption behaviors of two monomers of triblock copolymers (1,2-dimethoxyethane (1,2-DME) and 1,2-dimethoxypropane (1,2-DMP)) on a TiO2 surface in aqueous solution. A multiscale theoretical framework by means of the density functional theory (DFT), ab initio molecular dynamics (AIMD), and classical molecular dynamics (MD) simulations is established. The DFT calculation confirms that these molecules adsorb more energetically on a hydroxylated surface than pure oxide. There is a difference in adsorption behaviors between 1,2-DMP and 1,2-DME molecules due to the covalent bonding between carbons and oxygen of the hydroxylated TiO2 surface. The AIMD simulation reveals that the adsorption of both copolymers to the TiO2 surface is hindered by the presence of water with 1,2-DME exhibiting a weaker adsorption than 1,2-DMP. The presence of 1,2-DME on the TiO2 surface with water produced a smaller number of hydroxyl groups on the surface than 1,2-DMP. Moreover, the dissociative adsorption of water onto the rutile surface is the main cause for a chemical formation of terminating hydroxyl groups. The number of associated bonds is insignificant compared to the dissociated one since the dissociative adsorption is more favored than the associative one. MD simulation indicates that triblock copolymers adsorb stronger on the hydroxylated surface with a thinner adsorbed film thickness than that on the pure rutile. The presence of terminal hydroxyl groups on the rutile surface helps reducing the friction for aqueous 17R2 triblock copolymers, while it results in an increase of friction for normal copolymer L62.
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Affiliation(s)
- Thi D Ta
- School of Mechanical, Materials Mechatronic and Biomedical Engineering, Faculty of Engineering and Information Sciences (EIS), University of Wollongong, Northfield Avenue, Wollongong, New South Wales 2522, Australia
| | - A Kiet Tieu
- School of Mechanical, Materials Mechatronic and Biomedical Engineering, Faculty of Engineering and Information Sciences (EIS), University of Wollongong, Northfield Avenue, Wollongong, New South Wales 2522, Australia
| | - Bach H Tran
- School of Mechanical, Materials Mechatronic and Biomedical Engineering, Faculty of Engineering and Information Sciences (EIS), University of Wollongong, Northfield Avenue, Wollongong, New South Wales 2522, Australia
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Vyas B, Pillai SA, Ray D, Aswal VK, Wang MR, Chen LJ, Bahadur P. Interactions of alkyltriphenyl phosphonium based ionic liquids with block copolymer microstructures: A multitechnique study. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2019.112341] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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6
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Volkova T, Kumeev R, Kochkina N, Terekhova I. Impact of Pluronics of different structure on pharmacologically relevant properties of sulfasalazine and methotrexate. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.111076] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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7
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García Daza FA, Avalos JB, Mackie AD. Simulation Analysis of the Kinetic Exchange of Copolymer Surfactants in Micelles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:6794-6803. [PMID: 28608689 DOI: 10.1021/acs.langmuir.7b01225] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The exchange of surfactants in micelles involves several processes that are difficult to characterize experimentally. Microscopic simulations have the potential to reveal some of the key activities that occur when a surfactant spontaneously exits a micelle. In this work, we present a quantitative analysis of the kinetic exchange process over a large range of time. This study is based on a dynamic version of single-chain mean-field theory using a coarse-grained model for poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) triblock copolymer systems. The kinetics described in our simulations involves three different regimes. After a fast initial rearrangement of the labeled chains, the system undergoes a logarithmic relaxation, which has been experimentally observed. Contrary to what has been reported in previous analyses, our simulations indicate that this regime is caused by the intrinsic physical behavior of the system and is not due only to the polydispersity of the samples. Finally, the terminal regime is characterized by an exponential decay. The exit rates predicted by our simulations are in good agreement with the values reported experimentally. In addition, we address the sequence of microscopic conformational changes undergone by the surfactants when leaving the micellar aggregates. We found a subtle variation in the radius of gyration of the hydrophobic block, which challenges the image of either a complete collapse or a full stretching commonly accepted in the current theoretical and experimental literature.
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Affiliation(s)
- Fabián A García Daza
- Departament d'Enginyeria Química, ETSEQ, Universitat Rovira i Virgili , Avinguda dels Països Catalans 26, 43007 Tarragona, Spain
| | - Josep Bonet Avalos
- Departament d'Enginyeria Química, ETSEQ, Universitat Rovira i Virgili , Avinguda dels Països Catalans 26, 43007 Tarragona, Spain
| | - Allan D Mackie
- Departament d'Enginyeria Química, ETSEQ, Universitat Rovira i Virgili , Avinguda dels Països Catalans 26, 43007 Tarragona, Spain
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Ben Henda M, Gharbi A. Temperature, concentration and salt effect on F68 tri-block copolymer in aqueous solution: Rheological study. POLYMER SCIENCE SERIES A 2017. [DOI: 10.1134/s0965545x17030014] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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9
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Zhang H, Han L, Duan A, Xu C, Zhao Z, Wei Y, Jiang G, Liu J, Wang D, Xia Z. Synthesis of micro-mesoporous materials ZSM-5/FDU-12 and the performance of dibenzothiophene hydrodesulfurization. RSC Adv 2017. [DOI: 10.1039/c7ra03679e] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The micro-mesoporous materials ZF-x (ZSM-5-FDU-12, x = SiO2/Al2O3) with different molar ratios of SiO2/Al2O3 were synthesized by an in situ nano-assembly method with the ZSM-5 precursor serving as the silica source.
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Affiliation(s)
- Honglei Zhang
- State Key Laboratory of Heavy Oil Processing
- China University of Petroleum
- Beijing 102249
- P. R. China
- CNOOC Research Institute of Oil and Petrochemicals
| | - Longnian Han
- CNOOC Research Institute of Oil and Petrochemicals
- Beijing
- China
| | - Aijun Duan
- State Key Laboratory of Heavy Oil Processing
- China University of Petroleum
- Beijing 102249
- P. R. China
- State Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology
| | - Chunming Xu
- State Key Laboratory of Heavy Oil Processing
- China University of Petroleum
- Beijing 102249
- P. R. China
| | - Zhen Zhao
- State Key Laboratory of Heavy Oil Processing
- China University of Petroleum
- Beijing 102249
- P. R. China
| | - Yuechang Wei
- State Key Laboratory of Heavy Oil Processing
- China University of Petroleum
- Beijing 102249
- P. R. China
| | - Guiyuan Jiang
- State Key Laboratory of Heavy Oil Processing
- China University of Petroleum
- Beijing 102249
- P. R. China
| | - Jian Liu
- State Key Laboratory of Heavy Oil Processing
- China University of Petroleum
- Beijing 102249
- P. R. China
| | - Dong Wang
- CNOOC Research Institute of Oil and Petrochemicals
- Beijing
- China
| | - Zesheng Xia
- State Key Laboratory of Heavy Oil Processing
- China University of Petroleum
- Beijing 102249
- P. R. China
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10
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Ghaouar N, Baroudi M, Othman T. Contribution to the explanation of the association process of two triblock poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) copolymers and their mixtures in an aqueous solution. J Mol Liq 2016. [DOI: 10.1016/j.molliq.2016.09.123] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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11
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Ta TD, Tieu AK, Zhu H, Zhu Q, Kosasih PB, Zhang J, Deng G. Tribological Behavior of Aqueous Copolymer Lubricant in Mixed Lubrication Regime. ACS APPLIED MATERIALS & INTERFACES 2016; 8:5641-5652. [PMID: 26828119 DOI: 10.1021/acsami.5b10905] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Although a number of experiments have been attempted to investigate the lubrication of aqueous copolymer lubricant, which is applied widely in metalworking operations, a comprehensive theoretical investigation at atomistic level is still lacking. This study addresses the influence of loading pressure and copolymer concentration on the structural properties and tribological performance of aqueous copolymer solution of poly(propylene oxide)-poly(ethylene oxide)-poly(propylene oxide) (PPO-PEO-PPO) at mixed lubrication using a molecular dynamic (MD) simulation. An effective interfacial potential, which has been derived from density functional theory (DFT) calculations, was employed for the interactions between the fluid's molecules and iron surface. The simulation results have indicated that the triblock copolymer is physisorption on iron surface. Under confinement by iron surfaces, the copolymer molecules form lamellar structure in aqueous solution and behave differently from its bulk state. The lubrication performance of aqueous copolymer lubricant increases with concentration, but the friction reduction is insignificant at high loading pressure. Additionally, the plastic deformation of asperity is dependent on both copolymer concentration and loading pressure, and the wear behavior shows a linear dependence of friction force on the number of transferred atoms between contacting asperities.
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Affiliation(s)
- Thi D Ta
- School of Mechanical, Materials and Mechatronic Engineering, Faculty of Engineering and Information Sciences (EIS), University of Wollongong , Northfield Avenue, Wollongong, New South Wales 2522, Australia
| | - A Kiet Tieu
- School of Mechanical, Materials and Mechatronic Engineering, Faculty of Engineering and Information Sciences (EIS), University of Wollongong , Northfield Avenue, Wollongong, New South Wales 2522, Australia
| | - Hongtao Zhu
- School of Mechanical, Materials and Mechatronic Engineering, Faculty of Engineering and Information Sciences (EIS), University of Wollongong , Northfield Avenue, Wollongong, New South Wales 2522, Australia
| | - Qiang Zhu
- School of Mechanical, Materials and Mechatronic Engineering, Faculty of Engineering and Information Sciences (EIS), University of Wollongong , Northfield Avenue, Wollongong, New South Wales 2522, Australia
| | - Prabouno B Kosasih
- School of Mechanical, Materials and Mechatronic Engineering, Faculty of Engineering and Information Sciences (EIS), University of Wollongong , Northfield Avenue, Wollongong, New South Wales 2522, Australia
| | - Jie Zhang
- School of Mechanical, Materials and Mechatronic Engineering, Faculty of Engineering and Information Sciences (EIS), University of Wollongong , Northfield Avenue, Wollongong, New South Wales 2522, Australia
| | - Guanyu Deng
- School of Mechanical, Materials and Mechatronic Engineering, Faculty of Engineering and Information Sciences (EIS), University of Wollongong , Northfield Avenue, Wollongong, New South Wales 2522, Australia
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12
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Aggregation properties of amphiphilic poly(ethylene oxide)‐poly(propylene oxide)‐poly(ethylene oxide) block copolymer studied by cyclic voltammetry. J SURFACTANTS DETERG 2015. [DOI: 10.1007/s11743-004-0322-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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13
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García Daza FA, Colville AJ, Mackie AD. Mean-field coarse-grained model for poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) triblock copolymer systems. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:3596-3604. [PMID: 25746687 DOI: 10.1021/la504884m] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The microscopic modeling of surfactant systems is of the utmost importance in understanding the mechanisms related to the micellization process because it allows for prediction and comparison with experimental data of diverse equilibrium system properties. In this work, we present a coarse-grained model for Pluronics, a trademarked type of triblock copolymer, from simulations based on a single-chain mean-field theory (SCMF). This microscopic model is used to quantify the micellization process of these nonionic surfactants at 37 °C and has been shown to be able to quantitatively reproduce experimental data of the critical micelle concentration (CMC) along with other equilibrium properties. In particular, these results correctly capture the experimental behavior with respect to the lengths of the hydrophobic and hydrophilic moieties of the surfactants for low and medium hydrophobicities. However, for the more highly hydrophobic systems with low CMCs, a deviation is found which has been previously attributed to nonequilibrium effects in the experimental data (Garcı́a Daza, F. A.; Mackie, A. D. Low Critical Micelle Concentration Discrepancy between Theory and Experiment. J. Phys. Chem. Lett. 2014, 5, 2027-2032).
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Affiliation(s)
- Fabián A García Daza
- †Departament d'Enginyeria Química, ETSEQ, Universitat Rovira i Virgili, Avinguda dels Països Catalans 26, 43007 Tarragona, Spain
| | - Alexander J Colville
- ‡Department of Chemical Engineering, Northeastern University, 360 Huntington Avenue, Boston, Massachusetts 02115-5000, United States
| | - Allan D Mackie
- †Departament d'Enginyeria Química, ETSEQ, Universitat Rovira i Virgili, Avinguda dels Països Catalans 26, 43007 Tarragona, Spain
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14
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Guzman-Sepulveda JR, Douglass KM, Amin S, Lewis NE, Dogariu A. Passive optical mapping of structural evolution in complex fluids. RSC Adv 2015. [DOI: 10.1039/c4ra11627e] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Low-coherence optical scattering allows probing the complex structure of self-assembling systems over extended ranges of the temperature and concentrations.
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Affiliation(s)
| | - Kyle M. Douglass
- CREOL
- The College of Optics and Photonics
- University of Central Florida
- Orlando
- USA
| | | | | | - Aristide Dogariu
- CREOL
- The College of Optics and Photonics
- University of Central Florida
- Orlando
- USA
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15
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Prhashanna A, Khan SA, Chen SB. Co-micellization behavior in poloxamers: dissipative particle dynamics study. J Phys Chem B 2014; 119:572-82. [PMID: 25521419 DOI: 10.1021/jp509237r] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Dissipative particle dynamics simulations are applied to investigate co-micellization behavior for binary mixtures of Poloxamers in dilute aqueous solution. In view of block length similarity/dissimilarity, four representative mixture cases are considered: F127/P123, F127/P105, P123/P84, and F127/L64. With appropriate interaction parameters, the simulations enable us to examine the formation of micelles, their types, size, shape, and composition. In the investigated concentration range, we find that pure and mixed micelles, both ellipsoidal, always coexist for all cases. At similar concentrations, both species form pure micelles of their own together with mixed micelles. In the case of F127/L64, it is found that the L64 chains are involved in the mixed micelles, even when the L64 concentration is below its CMC. The fraction of L64 involved in the mixed micelles is lower as compared to the other systems studied. For all cases, the proportion of mixed micelles can be increased when the two polymer species have similar concentrations. Moreover, shorter chains may prefer to straddle the core and corona in the region of ellipsoidal interface that is closer to the center of mixed micelle.
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Affiliation(s)
- Ammu Prhashanna
- Department of Chemical and Biomolecular Engineering National University of Singapore , Singapore 117585
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16
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Rheological Properties and Reverse Micelles Conditions of PEO-PPO-PEO Pluronic F68: Effects of Temperature and Solvent Mixtures. ACTA ACUST UNITED AC 2013. [DOI: 10.1155/2013/768653] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The rheological properties of Pluronic F68 were dissolved in various water/organic liquid mixtures over a wide range of temperatures, all at a concentration of 20 mg/mL. We have considered the following binary mixtures: Pluronic F68/water, F68/p-xylene, and F68/phenol. Various conformational transitions were detected and interpreted. We have also shown that these mixtures retain a Newtonian behavior independently of temperature and conformational changes. For ternary F68/p-xylene/water, F68/phenol/water, and F68/water/phenol mixtures, the behaviour of the solution is intimately related to the temperature and the amount of water and organic solvent added.
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Parmar A, Parekh P, Bahadur P. Solubilization and Release of a Model Drug Nimesulide from PEO–PPO–PEO Block Copolymer Core–Shell Micelles: Effect of Size of PEO Blocks. J SOLUTION CHEM 2013. [DOI: 10.1007/s10953-012-9949-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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18
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Glover AL, Nikles SM, Nikles JA, Brazel CS, Nikles DE. Polymer micelles with crystalline cores for thermally triggered release. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:10653-60. [PMID: 22726124 PMCID: PMC3415377 DOI: 10.1021/la300895c] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Interest in the use of poly(ethylene glycol)-b-polycaprolactone diblock copolymers in a targeted, magnetically triggered drug delivery system has led to this study of the phase behavior of the polycaprolactone core. Four different diblock copolymers were prepared by the ring-opening polymerization of caprolactone from the alcohol terminus of poly(ethylene glycol) monomethylether, M(n) ≈ 2000. The critical micelle concentration depended on the degree of polymerization for the polycaprolactone block and was in the range of 2.9 to 41 mg/L. Differential scanning calorimetry curves for polymer solutions with a concentration above the critical micelle concentration showed a melting endotherm in the range of 40 to 45 °C, indicating the polycaprolactone core was semicrystalline. Pyrene was entrapped in the micelle core without interfering with the ability of the polycaprolactone to crystallize. When the polymer solution was heated above the melting point of the micelle core, the pyrene was free to leave the core. Temperature-dependent measurements of the critical micelle concentration and temperature-dependent dynamic light scattering showed that the micelles remain intact at temperatures above the melting point of the polycaprolactone core.
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Affiliation(s)
- Amanda L. Glover
- Department of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487-0336
| | - Sarah M. Nikles
- Department of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487-0336
| | - Jacqueline A. Nikles
- Department of Chemistry, University of Alabama at Birmingham, Birmingham, Alabama 35294-1240
| | - Christopher S. Brazel
- Department of Chemical & Biological Engineering, The University of Alabama, Tuscaloosa, Alabama 35487-0203
| | - David E. Nikles
- Department of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487-0336
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Parmar A, Yerramilli U, Bahadur P. Effect of Hydrophobicity of PEO–PPO–PEO Block Copolymers on Micellization and Solubilization of a Model Drug Nimesulide. J SURFACTANTS DETERG 2011. [DOI: 10.1007/s11743-011-1308-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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21
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Nakashima K, Fujimoto Y, Anzai T. PHOTOLUMINESCENT PROPERTIES OF OCTADECYLRHODAMINE B IN MICELLES OF LOW-MOLECULAR-WEIGHT DETERGENTS AND WATER-SOLUBLE TRIBLOCK COPOLYMERS. Photochem Photobiol 2011. [DOI: 10.1111/j.1751-1097.1995.tb09874.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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22
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Micelles from PEO–PPO–PEO block copolymers as nanocontainers for solubilization of a poorly water soluble drug hydrochlorothiazide. Colloids Surf B Biointerfaces 2011; 83:49-57. [DOI: 10.1016/j.colsurfb.2010.10.041] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2010] [Revised: 10/22/2010] [Accepted: 10/23/2010] [Indexed: 11/23/2022]
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23
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Induced micellization and micellar transitions in aqueous solutions of non-linear block copolymer Tetronic® T904. J Colloid Interface Sci 2010; 351:449-56. [DOI: 10.1016/j.jcis.2010.07.046] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2010] [Revised: 07/16/2010] [Accepted: 07/16/2010] [Indexed: 11/23/2022]
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24
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Vasilescu M, Bandula R, Lemmetyinen H. Micropolarity and microviscosity of Pluronics L62 and L64 core–shell aggregates in water at various concentrations and additives examined by absorption and fluorescence probes. Colloid Polym Sci 2010. [DOI: 10.1007/s00396-010-2247-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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25
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Kostko AF, Harden JL, McHugh MA. Dynamic Light Scattering Study of Concentrated Triblock Copolymer Micellar Solutions under Pressure. Macromolecules 2009. [DOI: 10.1021/ma802503s] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- A. F. Kostko
- Department of Chemical and Life Science Engineering, Virginia Commonwealth University, Richmond, Virginia 23284
- Department of Physics, St. Petersburg State University of Refrigeration and Food Engineering, St. Petersburg, 191002, Russia
| | - J. L. Harden
- Department of Physics, University of Ottawa, Ottawa, ON K1N 6N5 Canada
| | - M. A. McHugh
- Department of Chemical and Life Science Engineering, Virginia Commonwealth University, Richmond, Virginia 23284
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Patel K, Bharatiya B, Kadam Y, Bahadur P. Micellization and Clouding Behavior of EO–PO Block Copolymer in Aqueous Salt Solutions. J SURFACTANTS DETERG 2009. [DOI: 10.1007/s11743-009-1127-5] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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27
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Ganguly R, Choudhury N, Aswal VK, Hassan PA. Pluronic L64 Micelles near Cloud Point: Investigating the Role of Micellar Growth and Interaction in Critical Concentration Fluctuation and Percolation. J Phys Chem B 2008; 113:668-75. [DOI: 10.1021/jp808304w] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- R. Ganguly
- Chemistry Division, Theoretical Chemistry Section, and Solid State Physics Division, Bhabha Atomic Research Center, Mumbai 400 085, India
| | - N. Choudhury
- Chemistry Division, Theoretical Chemistry Section, and Solid State Physics Division, Bhabha Atomic Research Center, Mumbai 400 085, India
| | - V. K. Aswal
- Chemistry Division, Theoretical Chemistry Section, and Solid State Physics Division, Bhabha Atomic Research Center, Mumbai 400 085, India
| | - P. A. Hassan
- Chemistry Division, Theoretical Chemistry Section, and Solid State Physics Division, Bhabha Atomic Research Center, Mumbai 400 085, India
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28
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Holder SJ, Durand GG, Yeoh C, Illi E, Hardy NJ, Richardson TH. The synthesis and self‐assembly of ABA amphiphilic block copolymers containing styrene and oligo(ethylene glycol) methyl ether methacrylate in dilute aqueous solutions: Elevated cloud point temperatures for thermoresponsive micelles. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/pola.23077] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Simon J. Holder
- Functional Materials Group, School of Physical Sciences, University of Kent, Canterbury, Kent CT2 7NH, United Kingdom
| | - Geraldine G. Durand
- Functional Materials Group, School of Physical Sciences, University of Kent, Canterbury, Kent CT2 7NH, United Kingdom
| | - Chert‐Tsun Yeoh
- Functional Materials Group, School of Physical Sciences, University of Kent, Canterbury, Kent CT2 7NH, United Kingdom
| | - Elodie Illi
- Functional Materials Group, School of Physical Sciences, University of Kent, Canterbury, Kent CT2 7NH, United Kingdom
| | - Nicholas J. Hardy
- Department of Physics and Astronomy, Nanomaterials Engineering Group, The University of Sheffield, Hicks Building, Hounsfield Road, Sheffield S3 7RH, United Kingdom
| | - Tim H. Richardson
- Department of Physics and Astronomy, Nanomaterials Engineering Group, The University of Sheffield, Hicks Building, Hounsfield Road, Sheffield S3 7RH, United Kingdom
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29
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Bonacucina G, Misici-Falzi M, Cespi M, Palmieri GF. Characterization of Micellar Systems by the Use of Acoustic Spectroscopy. J Pharm Sci 2008; 97:2217-27. [PMID: 17853431 DOI: 10.1002/jps.21156] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Acoustic spectroscopy affords a new and unique way to characterize concentrated suspension and emulsion while avoiding the limitations imposed by dilution, an undesirable step, particularly with highly structured samples. This study sought to illustrate the potentialities of this technique by using it to characterize the self-assembling behaviour of Poloxamer 407 systems (3-25%, w/v), both alone or after the addition of various amounts of hydroxypropyl beta-cyclodextrin (5-20%, w/v). Particle size and the microrheological extensional moduli (G' and G'') of the systems were determined from acoustic parameters such as sound attenuation and speed. By monitoring the variation of the particle size and the rheological extensional moduli at increasing temperatures, it was possible to define and outline the Poloxamer 407 transitions and the effect of the HP beta-CD on them. Poloxamer 407 micelle formation due to progressive dehydration occurred within a temperature interval of 15 degrees C (including gelation) and was dependent on poloxamer concentration. Particularly, particle size of the aggregates changed within this interval. Mean diameters were 600 nm at the onset of micelle formation and decreased after the thermogel formation to more or less 75 nm. The presence of HP beta-CD changed the basic self-assembling mechanism of Poloxamer 407 by increasing micelle formation and particularly thermogelation temperatures. The results confirm that acoustic spectroscopy offers a powerful method for characterizing heterogeneous systems, thus indicating its potential for applications in the pharmaceutical field.
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Affiliation(s)
- Giulia Bonacucina
- Department of Chemical Sciences, University of Camerino, via S. Agostino 1, 62032 Camerino (MC), Italy
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30
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Yang S, Zhang X, Yuan S. Mesoscopic simulation studies on micellar phases of Pluronic P103 solution. J Mol Model 2008; 14:607-20. [DOI: 10.1007/s00894-008-0319-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2007] [Accepted: 04/16/2008] [Indexed: 11/30/2022]
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31
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Liang X, Guo C, Ma J, Wang J, Chen S, Liu H. Temperature-Dependent Aggregation and Disaggregation of Poly(ethylene oxide)-Poly(propylene oxide)-Poly(ethylene oxide) Block Copolymer in Aqueous Solution. J Phys Chem B 2007; 111:13217-20. [DOI: 10.1021/jp074990n] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xiangfeng Liang
- Laboratory of Separation Science and Engineering, State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Graduate University of Chinese Academy of Sciences, Beijing 100080, China
| | - Chen Guo
- Laboratory of Separation Science and Engineering, State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Graduate University of Chinese Academy of Sciences, Beijing 100080, China
| | - Junhe Ma
- Laboratory of Separation Science and Engineering, State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Graduate University of Chinese Academy of Sciences, Beijing 100080, China
| | - Jing Wang
- Laboratory of Separation Science and Engineering, State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Graduate University of Chinese Academy of Sciences, Beijing 100080, China
| | - Shu Chen
- Laboratory of Separation Science and Engineering, State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Graduate University of Chinese Academy of Sciences, Beijing 100080, China
| | - Huizhou Liu
- Laboratory of Separation Science and Engineering, State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Graduate University of Chinese Academy of Sciences, Beijing 100080, China
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32
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Ye X, Lu Y, Liu S, Zhang G, Wu C. Ultrafast infrared heating laser pulse-induced micellization kinetics of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) in water. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:10366-71. [PMID: 17705518 DOI: 10.1021/la701626k] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
The heating-induced micellization of poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide) (Pluronic PE10300) triblock copolymer chains was studied by ultrasensitive differential scanning calorimetry, laser light scattering, and fluorescence spectrometry with a fluorescent probe, 8-anilino-1-naphthalenesulfonic acid ammonium salt. The critical micellization temperatures obtained from the three methods are similar. The micellization kinetics was studied in terms of changes in the fluorescence and Rayleigh scattering intensities after an ultrafast infrared heating laser pulse (approximately 10 ns)-induced temperature jump. The increases in the fluorescence and Rayleigh scattering intensities in the millisecond range can be well described by a single-exponential equation, corresponding to the incorporation of individual triblock copolymer chains (unimers) into large spherical micelles. The increase in copolymer concentration or the initial solution temperature decreases the characteristic transition time. In general, the fluorescence measurement has a better signal-to-noise ratio but leads to a transition time that is slightly shorter than that from the corresponding Rayleigh scattering measurement for a given copolymer solution.
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Affiliation(s)
- Xiaodong Ye
- The Hefei National Laboratory for Physical Sciences at Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
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Nakashima K, Bahadur P. Aggregation of water-soluble block copolymers in aqueous solutions: recent trends. Adv Colloid Interface Sci 2006; 123-126:75-96. [PMID: 16860770 DOI: 10.1016/j.cis.2006.05.016] [Citation(s) in RCA: 197] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
This review summarizes recent literature and some of our own results on aggregation behavior on water-soluble block copolymers belonging to three different classes viz. hydrophilic-hydrophobic (AB, ABA and BAB) block copolymers, double hydrophilic block copolymers (DHBCs) and ABC triblock copolymers. In the case of amphiphilic copolymers, special attention has been focussed on aggregation of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) triblock copolymers (Pluronics) and their aggregation in aqueous solutions at different temperatures as well as in the presence of various additives. Recent studies based on modern techniques viz. scattering (static and dynamic light scattering and small angle neutron scattering), spectral methods, e.g., fluorescence (static and time resolved), nuclear magnetic resonance and Fourier transform infrared spectroscopies, thermal methods e.g., differential scanning calorimetry and isothermal titration calorimetry, cryotransmission electron microscopy, ultrasonic absorption along with general physical properties like surface tension, viscosity and dye solubilization are summarized. For the DHBCs where one of the blocks is usually a polyion, complex formation by adding oppositely charged ions induces the formation of nanoaggregates. Characterization of such nanoaggregates of polyion complexes of DHBCs and their potential use for incorporation of ionic solutes in the micellar core are reviewed. The formation and characteristics of core-shell-corona micelles of ABC triblock copolymers and their applications as vehicles for controlled drug release are also discussed.
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Affiliation(s)
- Kenichi Nakashima
- Department of Chemistry, Faculty of Science and Engineering, Saga University, 1 Honjo-machi, Saga 840-8502, Japan
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34
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Zhang X, Yuan S, Wu J. Mesoscopic Simulation on Phase Behavior of Ternary Copolymeric Solution in the Absence and Presence of Shear. Macromolecules 2006. [DOI: 10.1021/ma061201b] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xiuqing Zhang
- Key Laboratory of Colloid and Interface Chemistry, Shandong University, Jinan 250100, China, and Institute of Theoretical Chemistry, Shandong University, Jinan 250100, China
| | - Shiling Yuan
- Key Laboratory of Colloid and Interface Chemistry, Shandong University, Jinan 250100, China, and Institute of Theoretical Chemistry, Shandong University, Jinan 250100, China
| | - Jian Wu
- Key Laboratory of Colloid and Interface Chemistry, Shandong University, Jinan 250100, China, and Institute of Theoretical Chemistry, Shandong University, Jinan 250100, China
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35
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Causse J, Lagerge S, de Menorval LC, Faure S. Micellar solubilization of tributylphosphate in aqueous solutions of Pluronic block copolymers. J Colloid Interface Sci 2006; 300:724-34. [PMID: 16765368 DOI: 10.1016/j.jcis.2006.04.043] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2005] [Revised: 04/14/2006] [Accepted: 04/15/2006] [Indexed: 10/24/2022]
Abstract
The solubilization of tributylphosphate (TBP), a polar oil, in various micellar solutions of Pluronic has been investigated by (1)H NMR spectroscopy. Partial phase diagrams of the three components systems (Pluronic-TBP-water) have shown two characteristic temperatures, called CPT and SMT, which control the phase behavior (see Part I); Both temperature depend on the copolymer structure and, interestingly, are directly related to the TBP concentration in the medium. Monophasic microemulsions are observed only when the temperature ranges between the SMT and the CPT. Moreover, the evolution of the CPT with the TBP content clearly indicated the occurrence of a structural change of the microemulsions which allows higher quantities of TBP to be solubilized. In this second part, (1)H NMR studies of TPB/micellar systems have essentially focused on elucidating the nature of the interactions between TBP and micelle, or on the location of the solubilized species, mainly from the dependence of chemical shifts or linewidths on TBP concentration. Especially, the NMR spectra of the microemulsions before and after the structural change have been compared with those obtained for pure solution of Pluronic in D(2)O at different temperatures and in CDCl(3). The analysis of the (1)H NMR chemical shifts suggests a structural transformation of the TBP-Pluronic micelles in the sense of an hydrophobic TBP-PPO core becoming more and more dense as the TBP concentration increases. Especially, (1)H NMR data evidence an evolution of the hydration state of the hydrophobic core following addition of TBP in the micellar solutions. During the addition of TBP, the microemulsion structure turns from spherical swelled micelles to nanodroplets of pure TBP stabilized by the Pluronic (pure nanophase of TBP stabilized by the copolymer). It is shown that the structural change strongly depends on the temperatures (CPT and SMT, see Part I) and on the copolymer structure.
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Affiliation(s)
- J Causse
- Laboratoire des Agrégats Moléculaires et Matériaux Inorganiques, C.N.R.S. UMR-5072, Université de Montpellier II, CC 015, Place E. Bataillon, 34095 Montpellier Cedex 05, France
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36
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Causse J, Lagerge S, de Menorval LC, Faure S. Micellar solubilization of tributylphosphate in aqueous solutions of Pluronic block copolymers. J Colloid Interface Sci 2006; 300:713-23. [PMID: 16765367 DOI: 10.1016/j.jcis.2006.04.042] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2005] [Revised: 04/13/2006] [Accepted: 04/15/2006] [Indexed: 10/24/2022]
Abstract
Solubilization of tributylphosphate (TBP), a polar oil, in various micellar solutions of Pluronic has been investigated by turbidimetry emphasizing the effect of temperature and the role of the PPO and PEO blocks on the phase behavior of the three components systems (Pluronic-TBP-water). [Temperature-composition] diagrams allow monophasic and diphasic domains to be delimited. Two temperatures are shown to have a determining effect on the phase behavior (TBP solubilization); the well known cloud point temperature (CPT, here defined for the three components system) and the solubilization minimum temperature (SMT) which is defined as the lowest temperature allowing solubilization of TBP in the system. Both temperature depend on the copolymer structure and, interestingly, are directly related to the TBP concentration in the medium. Monophasic microemulsions are observed when the temperature ranges between the SMT and the CPT. When T<SMT, the phase separation occurs and is related to the formation of TBP in water emulsion droplets. When T>CPT the system separates in two phase due to the co-precipitation of TBP and Pluronic. Moreover an unexpected evolution of the CPT with the TBP content clearly indicates the occurrence of a structural change of the microemulsions which allows higher quantities of TBP to be solubilized. But the structural change does not allow alone higher quantities of TBP to be solubilized. A well compromise between the SMT and the CPT must be also observed so as to obtain a large extent of monophasic domain after the restructuration. The best compromise is obtained with Pluronics with intermediate hydrophobic character. Reversely, hydrophobic and hydrophilic Pluronics exhibit a very small extent of monophasic domain after the restructuration which does not allow benefit by the structural change.
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Affiliation(s)
- J Causse
- Laboratoire des Agrégats Moléculaires et Matériaux Inorganiques, C.N.R.S. UMR-5072, Université de Montpellier II, CC 015, Place E. Bataillon, 34095 Montpellier Cedex 05, France
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37
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Chen H, Li W, Zhao H, Gao J, Zhang Q. Thermo-induced formation of physical “cross-linking points” of PNIPAM-g-PEO in semidilute aqueous solutions. J Colloid Interface Sci 2006; 298:991-5. [PMID: 16460749 DOI: 10.1016/j.jcis.2005.12.067] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2005] [Revised: 12/24/2005] [Accepted: 12/30/2005] [Indexed: 11/26/2022]
Abstract
Linear poly(N-isopropylacrylamide) chains grafted with short poly(ethylene oxide) chains (PNIPAM-g-PEO) were prepared by free radical copolymerization of NIPAM and PEO macromonomers (M(w) = 5000 g/mol) end-capped with methacrylate in water. Temperature effects on the solution viscosity of thermally sensitive copolymer were studied in different aqueous concentrations. A specific transition was observed during the measurement of the reduced viscosities of PNIPAM-g-PEO copolymer at a certain concentration (C0) in semidilute aqueous solutions: the reduced viscosities increased sharply (namely, thermothickening behavior) at LCST when concentrations were higher than C0, or decreased sharply at LCST when concentrations lower than C0. A plateau was also found near C0 when temperature was closing to LCST from low temperature, showing there is no change in reduced viscosity under this circumstance. The inverse increase of the viscosities at higher temperatures in higher concentration (> approximately 3 g/L) is attributed to the forming of physical "cross-linking points" composed of collapsed PNIPAM core and expanded PEO shell. The sharp decrease of the viscosities at higher temperatures in lower concentration (< approximately 3 g/L) is attributed to the forming of independent globules. The plateau could be attributed to the equilibrium competition between forming of physical "cross-linking points" and independent globules depending on the copolymer solution concentrations.
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Affiliation(s)
- Hongwei Chen
- Structure Research Laboratory, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, China
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38
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Sen P, Ghosh S, Sahu K, Mondal SK, Roy D, Bhattacharyya K. A femtosecond study of excitation wavelength dependence of solvation dynamics in a PEO-PPO-PEO triblock copolymer micelle. J Chem Phys 2006; 124:204905. [PMID: 16774382 DOI: 10.1063/1.2197495] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Excitation wavelength (lambdaex) dependence of solvation dynamics of coumarin 480 (C480) in the micellar core of a water soluble triblock copolymer, PEO20-PPO70-PEO20 (Pluronic P123), is studied by femtosecond and picosecond time resolved emission spectroscopies. In the P123 micelle, the width of the emission spectrum of C480 is found to be much larger than that in bulk water. This suggests that the P123 micelle is more heterogeneous than bulk water. The steady state emission maximum of C480 in P123 micelle shows a significant red edge excitation shift by 25 nm from 453 nm at lambdaex=345 nm to 478 nm at lambdaex=435 nm. The solvation dynamics in the interior of the triblock copolymer micelle is found to depend strongly on the excitation wavelength. The excitation wavelength dependence is ascribed to a wide distribution of locations of C480 molecules in the P123 micelle with two extreme environments-a bulklike peripheral region with very fast solvent response and a very slow core region. With increase in lambdaex, contribution of the bulklike region having an ultrafast component (< or =2 ps) increases from 7% at lambdaex=375 nm to 78% at lambda(ex)=425 nm while the contribution of the ultraslow component (4500 ps) decreases from 79% to 17%.
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Affiliation(s)
- Pratik Sen
- Physical Chemistry Department, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
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39
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Desai H, Varade D, Aswal V, Goyal P, Bahadur P. Micellar characteristics of diblock polyacrylate–polyethylene oxide copolymers in aqueous media. Eur Polym J 2006. [DOI: 10.1016/j.eurpolymj.2005.08.016] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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40
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Jebari MM, Ghaouar N, Aschi A, Gharbi A. Aggregation behaviour of Pluronic® L64 surfactant at various temperatures and concentrations examined by dynamic light scattering and viscosity measurements. POLYM INT 2006. [DOI: 10.1002/pi.1935] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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41
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Mata JP, Majhi PR, Guo C, Liu HZ, Bahadur P. Concentration, temperature, and salt-induced micellization of a triblock copolymer Pluronic L64 in aqueous media. J Colloid Interface Sci 2005; 292:548-56. [PMID: 16024036 DOI: 10.1016/j.jcis.2005.06.013] [Citation(s) in RCA: 116] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2005] [Revised: 05/31/2005] [Accepted: 06/03/2005] [Indexed: 11/17/2022]
Abstract
The effect of copolymer concentration, temperature, and sodium halides (NaI, NaBr, NaCl, and NaF) on micellization and micellar properties of a poly(ethylene oxide)-block-poly(propylene oxide)-block-poly(ethylene oxide) (PEO-PPO-PEO) amphiphilic copolymer (Pluronic L64: EO13PO30EO13), was examined by different methods such as dye spectral change, Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), small angle neutron scattering (SANS), dynamic light scattering (DLS), viscosity, and cloud point (CP). Temperature/polymer concentration/salt dependent aggregation behavior of L64 was observed. The data on critical micelle concentration (CMC), critical micelle temperature (CMT), (CP), micelle size, and shape are reported. The Fourier transform infrared (FTIR) showed temperature dependent changes in C-O-C stretching variation band towards higher wave numbers and broadening of band width during the micellization process; this was attributed to increase in proportion of the anhydrous methyl groups, while the proportion of the hydrated methyl groups was decreased. Differential scanning calorimetry (DSC) provides CMTs and CPs from the same experiment. CMC values derived from dye spectral change, decrease significantly with the addition of salt. The increases in salt/copolymer concentration lower the onset temperature of micellization (CMT). Halide anions influence both CMT and CP in the order of F- > Cl- > Br- > I- when total salt and copolymer concentration kept constant. SANS results show the increase of inter-micellar interaction due to the increase in temperature/salt concentration; this is supported by viscosity data.
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Affiliation(s)
- J P Mata
- Department of Chemistry, Veer Narmad South Gujarat University, Surat 395007, India.
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42
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Grant CD, Steege KE, Bunagan MR, Castner EW. Microviscosity in Multiple Regions of Complex Aqueous Solutions of Poly(ethylene oxide)−Poly(propylene oxide)−Poly(ethylene oxide). J Phys Chem B 2005; 109:22273-84. [PMID: 16853900 DOI: 10.1021/jp053929k] [Citation(s) in RCA: 92] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Aqueous poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO109-PPO41-PEO109) copolymers are nonionic surfactants that self-organize to form aggregate structures with increasing temperature or concentration. We have studied two concentrations over a range of temperatures so that the copolymers are in one of three microphases: unimers, micelles, or hydrogels formed from body centered cubic aggregates of micelles. Three different coumarin dyes were chosen based on their hydrophobicity so that different aggregate regions could be probed independently-water insoluble coumarin 153 (C153), hydrophobic coumarin 102 (C102), and the hydrophilic sodium carboxylate form of coumarin 343 (C343-). Fluorescence anisotropy experiments provide detailed information on the local microviscosity. C153 experiences a fourfold increase in reorientation time and hence microviscosity with increasing temperature through the microphase transition from unimers to micelles. C102 also shows an increase in microviscosity with temperature but smaller in magnitude and with the microphase transition shifted to higher temperature relative to C153. C343- shows only a slight sensitivity to the microphase transition. For any of the three coumarin probes, fluorescence anisotropies do not show any correlation with the microphase transition to form cubic hydrogels.
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Affiliation(s)
- Christian D Grant
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, New Jersey 08854-8087, USA
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43
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Bakshi MS, Sachar S, Singh K, Shaheen A. Mixed micelle behavior of Pluronic L64 and Triton X-100 with conventional and dimeric cationic surfactants. J Colloid Interface Sci 2005; 286:369-77. [PMID: 15848440 DOI: 10.1016/j.jcis.2004.12.044] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2004] [Accepted: 12/16/2004] [Indexed: 10/25/2022]
Abstract
The mixed micellar properties of a triblock copolymer, Pluronic L64, (EO)13(PO)30(EO)13, and a nonionic surfactant, Triton X-100, in aqueous solution with conventional alkyl ammonium bromides and their dimeric homologues were investigated with the help of fluorescence and cloud point measurements. The composition of mixed micelles and the interaction parameter, beta, evaluated from the critical micelle concentration (cmc) data for different mixtures using Rubingh's and Motomura's theories are discussed. It has been observed that the mixed micelle formation between monomeric/dimeric alkyl ammonium bromides and L64 was due to synergistic interactions which increase with the increase in hydrophobicity of the cationic component. On the other hand, synergistic mixing was observed in the mixed micelles of Triton X-100 and monomeric cationic surfactants, the magnitude of which decreases slightly with the increase in hydrophobicity of the cationic component. Antagonistic interactions were observed in the case of Triton X-100 and dimeric cationic surfactants.
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Affiliation(s)
- Mandeep Singh Bakshi
- Department of Chemistry, Guru Nanak Dev University, Amritsar 143005, Punjab, India.
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44
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Grant CD, DeRitter MR, Steege KE, Fadeeva TA, Castner EW. Fluorescence probing of interior, interfacial, and exterior regions in solution aggregates of poly(ethylene oxide)- poly(propylene oxide)-poly(ethylene oxide) triblock copolymers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:1745-1752. [PMID: 15723468 DOI: 10.1021/la047560m] [Citation(s) in RCA: 101] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Fluorescence spectroscopy is used to probe local environments within regions of different polarity and hydrophobicity in aqueous aggregates of PEO(109)-PPO(41)-PEO(109) triblock copolymers. These copolymer aggregates have well characterized microphases in aqueous solution. Concentrations and temperatures for our studies are chosen such that the copolymers are in unimer, micellar, or micellar hydrogel forms. The observed fluorescence spectra and lifetimes from solutions individually labeled with each of the three coumarin probes report on the changes in the local polarity of the core, exterior, interfacial, and corona regions of these copolymer aggregates. This multiple fluorescence probe methodology will be straightforward to apply in general to problems in polymer and biopolymer aggregates, especially those that display strong hydrophobic effects.
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Affiliation(s)
- Christian D Grant
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, New Jersey 08854-8087, USA
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45
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Xia X, Hu Z, Marquez M. Physically bonded nanoparticle networks: a novel drug delivery system. J Control Release 2005; 103:21-30. [PMID: 15710497 DOI: 10.1016/j.jconrel.2004.11.016] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2004] [Revised: 11/12/2004] [Accepted: 11/12/2004] [Indexed: 11/23/2022]
Abstract
Monodispersed nanoparticles consisting of interpenetrating polymer networks (IPNs) of polyacrylic acid (PAAc) and poly(N-isopropylacrylamide) (PNIPAM) were prepared by a seed-and-feed method. The temperature-dependent viscosity measurement revealed that the IPN nanoparticle dispersions with polymer concentrations above 2.5 wt.% underwent an inverse thermoreversible gelation at about 33 degrees C. Dextran markers of various molecular weights as model macromolecular drugs were mixed with the IPN nanoparticle dispersion at room temperature. At body temperature, the dispersion became a gel. The drug release profiles were then measured using UV-Visible spectroscopy as a function of particle size and polymer concentration. The schematic structure of the nanoparticle network was proposed based on the experimental results. The drug delivery model presented here was significant because such a dispersion and a drug was mixed without chemical reaction at room temperature to form a drug delivery liquid. This liquid could be injected into a body to form in situ a gelled drug depot to release the drug slowly.
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Affiliation(s)
- Xiaohu Xia
- Department of Physics, University of North Texas, Denton, TX 76203, USA
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46
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Turbidity and 1H NMR analysis of the solubilization of tributylphosphate in aqueous solutions of an amphiphilic triblock copolymer (L64 pluronic). Colloids Surf A Physicochem Eng Asp 2005. [DOI: 10.1016/j.colsurfa.2004.09.024] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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47
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Rangelov S, Dimitrov P, Tsvetanov CB. Mixed Block Copolymer Aggregates with Tunable Temperature Behavior. J Phys Chem B 2005; 109:1162-7. [PMID: 16851076 DOI: 10.1021/jp046118+] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A block copolymer of propylene oxide (PO) and ethoxyethyl glycidyl ether (EEGE), (PO)(2)(EEGE)(6)(PO)(2), that has been found to possess lower critical solution temperature properties in water in the temperature range below 20 degrees C was mixed at 1:0.1, 1:1, and 1:10 weight ratios with commercially available Pluronic (L64 or P85) block copolymers. The cooperative association of the copolymers in aqueous solution was studied by dynamic light scattering over a wide temperature range (5-60 degrees C). At lower temperatures, the systems containing either L64 or P85 behave similarly irrespective of the composition: three species corresponding to (PO)(2)(EEGE)(6)(PO)(2) unimers, Pluronic-dominated mixed micelles, and large (50-60 nm in radius) composite (PO)(2)(EEGE)(6)(PO)(2)/Pluronic aggregates were identified. At a certain temperature, which is composition-dependent, the systems phase-separate [(PO)(2)(EEGE)(6)(PO)(2)/L64 1:0.1], enter an interval of instability [(PO)(2)(EEGE)(6)(PO)(2)/L64 1:1 and 1:10], or rearrange by dissociation of the large composite particles [(PO)(2)(EEGE)(6)(PO)(2)/P85]. The presence of a Pluronic micellar peak in the relaxation time distribution at lower temperatures, the dimensions of the composite particles, and the different behavior of the systems at elevated temperatures are discussed. A possible application of the thermosensitive mixtures in delivery/release of active substances is suggested.
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Affiliation(s)
- Stanislav Rangelov
- Institute of Polymers, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria.
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Ihara T, Nishioka T, Kamitani H, Kitsuki T. Solution Properties of a Novel Polysaccharide Derivative. CHEM LETT 2004. [DOI: 10.1246/cl.2004.1094] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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49
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Xia X, Hu Z. Synthesis and light scattering study of microgels with interpenetrating polymer networks. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2004; 20:2094-2098. [PMID: 15835657 DOI: 10.1021/la0354483] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Monodispersed microgels composed of poly(acrylic acid) (PAAc) and poly(N-isopropylacrylamide) (PNIPAM) interpenetrating polymer networks (IPN) were synthesized by a two-step method, first preparing PNIPAM microgel and then polymerizing acrylic acid that interpenetrates into the PNIPAM network. The growth kinetics of the IPN particle formation was obtained by measuring the turbidity and particle hydrodynamic radius (Rh) as a function of reaction time. IPN and PNIPAM microgels were characterized and compared by dynamic and static light scattering techniques. The concentrated aqueous solutions of the PNIPAM-PAAc IPN microgels exhibit an inverse thermoreversible gelation. In contrast to polymer solutions of poly(NIPAM-co-AAc) that have the inverse thermoreversible gelation, our system can self-assemble into an ordered structure, displaying bright colors. Furthermore, IPN microgels undergo the reversible volume phase transitions in response to both pH and temperature changes associated with PAAc and PNIPAM networks, respectively.
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Affiliation(s)
- Xiaohu Xia
- Departments of Physics and Chemistry, University of North Texas, Denton, Texas 76203, USA
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50
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Vogel R, Harvey M, Edwards G, Meredith P, Heckenberg N, Trau M, Rubinsztein-Dunlop H. Dimer-to-Monomer Transformation of Rhodamine 6G in Aqueous PEO−PPO−PEO Block Copolymer Solutions. Macromolecules 2002. [DOI: 10.1021/ma010995l] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- R. Vogel
- The Centre for Nanotechnology and Biomaterials and The Centre for Laser Science, The University of Queensland, Brisbane Qld 4072, Australia
| | - M. Harvey
- The Centre for Nanotechnology and Biomaterials and The Centre for Laser Science, The University of Queensland, Brisbane Qld 4072, Australia
| | - G. Edwards
- The Centre for Nanotechnology and Biomaterials and The Centre for Laser Science, The University of Queensland, Brisbane Qld 4072, Australia
| | - P. Meredith
- The Centre for Nanotechnology and Biomaterials and The Centre for Laser Science, The University of Queensland, Brisbane Qld 4072, Australia
| | - N. Heckenberg
- The Centre for Nanotechnology and Biomaterials and The Centre for Laser Science, The University of Queensland, Brisbane Qld 4072, Australia
| | - M. Trau
- The Centre for Nanotechnology and Biomaterials and The Centre for Laser Science, The University of Queensland, Brisbane Qld 4072, Australia
| | - H. Rubinsztein-Dunlop
- The Centre for Nanotechnology and Biomaterials and The Centre for Laser Science, The University of Queensland, Brisbane Qld 4072, Australia
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