1
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Clouding development, interaction, and thermodynamics of triton X-100 + sodium alginate mixture: Impacts of sodium salts and hydrotropic compositions. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120595] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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2
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Chakrabarti C, Mevada C, Ray D, Aswal VK, Pillai SA. Influence of sodium salts on the phase and gelation behaviour of T1107 to be used as proposed polymer gel electrolyte. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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3
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Castellvi Corrons X, Gummel J, Smets J, Berti D. Liquid-liquid phase separated microdomains of an amphiphilic graft copolymer in a surfactant-rich medium. J Colloid Interface Sci 2022; 615:807-820. [PMID: 35180629 DOI: 10.1016/j.jcis.2022.02.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Revised: 01/29/2022] [Accepted: 02/06/2022] [Indexed: 11/28/2022]
Abstract
The liquid-liquid phase separation (LLPS) of amphiphilic thermoresponsive copolymers can lead to the formation of micron-sized domains, known as simple coacervates. Due to their potential to confine active principles, these copolymer-rich droplets have gained interest as encapsulating agents. Understanding and controlling the conditions inducing this LLPS is therefore essential for applicative purposes and requires thorough fundamental studies on self-coacervation. In this work, we investigate the LLPS of a comb-like graft copolymer (PEG-g-PVAc) consisting of a poly(ethylene glycol) backbone (6 kDa) with ∼2-3 grafted poly(vinyl acetate) chains, and a PEG/PVAc weight ratio of 40/60. Specifically, we report the effect of various water-soluble additives on its phase separation behavior. Kosmotropes and non-ionic surfactants were found to decrease the phase separation temperature of the copolymer, while chaotropes and, above all, ionic surfactants increased it. We then focus on the phase behavior of PEG-g-PVAc in the presence of sodium citrate and a C14-15 E7 non-ionic surfactant (N45-7), defining the compositional range for the generation of LLPS microdomains at room temperature and monitoring their formation with fluorescence confocal microscopy. Finally, we determine the composition of the microdomains through confocal Raman microscopy, demonstrating the presence of PEG-g-PVAc, N45-7, and water. These results expand our knowledge on polymeric self-coacervation, clarifying the optimal conditions and composition needed to obtain LLPS microdomains with encapsulation potential at room temperature in surfactant-rich formulations.
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Affiliation(s)
- Xavier Castellvi Corrons
- Department of Chemistry "Ugo Schiff" University of Florence, CSGI, Via della Lastruccia 3, 50019 Sesto Fiorentino Florence, Italy
| | - Jeremie Gummel
- Strategic Innovation and Technology, Procter & Gamble Brussels Innovation Center, Temselaan 100, 1853 Grimbergen, Belgium
| | - Johan Smets
- Strategic Innovation and Technology, Procter & Gamble Brussels Innovation Center, Temselaan 100, 1853 Grimbergen, Belgium
| | - Debora Berti
- Department of Chemistry "Ugo Schiff" University of Florence, CSGI, Via della Lastruccia 3, 50019 Sesto Fiorentino Florence, Italy
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4
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Micellization and gelation characteristics of different blends of pluronic F127/methylcellulose and their use as mucoadhesive in situ gel for periodontitis. Polym Bull (Berl) 2021. [DOI: 10.1007/s00289-021-03722-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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5
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Bartolini A, Tempesti P, Ghobadi AF, Berti D, Smets J, Aouad YG, Baglioni P. Liquid-liquid phase separation of polymeric microdomains with tunable inner morphology: Mechanistic insights and applications. J Colloid Interface Sci 2019; 556:74-82. [DOI: 10.1016/j.jcis.2019.08.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2019] [Revised: 08/03/2019] [Accepted: 08/05/2019] [Indexed: 11/29/2022]
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6
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Ta D, Tieu A, Zhu H, Le M, Ta T, Tran V, Wan S. Physical and chemical insights into molecular adsorption of copolymer’s monomers on Rutile surface. Chem Phys 2019. [DOI: 10.1016/j.chemphys.2018.12.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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7
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Fellechner O, Rotzolk S, Smirnova I. Long-Chain Alcohol-Modified Micellar Systems and Their Application in a Continuous Extraction Process. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.8b04617] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Oliver Fellechner
- Institute of Thermal Separation Processes, Hamburg University of Technology, Eißendorfer Straße 38, D-21075 Hamburg, Germany
| | - Sebastian Rotzolk
- Institute of Thermal Separation Processes, Hamburg University of Technology, Eißendorfer Straße 38, D-21075 Hamburg, Germany
| | - Irina Smirnova
- Institute of Thermal Separation Processes, Hamburg University of Technology, Eißendorfer Straße 38, D-21075 Hamburg, Germany
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8
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He Z, Ma Y, Alexandridis P. Comparison of ionic liquid and salt effects on the thermodynamics of amphiphile micellization in water. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.09.061] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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9
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Nguyen TB, Phan CM. Influence of Temperature on the Surface Tension of Triton Surfactant Solutions. J SURFACTANTS DETERG 2018. [DOI: 10.1002/jsde.12228] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Trung B. Nguyen
- Discipline of Chemical Engineering and Curtin Institute of Functional Molecules and Interfaces; Curtin University; Perth WA 6845 Australia
| | - Chi M. Phan
- Discipline of Chemical Engineering and Curtin Institute of Functional Molecules and Interfaces; Curtin University; Perth WA 6845 Australia
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10
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Murdoch TJ, Humphreys BA, Johnson EC, Webber GB, Wanless EJ. Specific ion effects on thermoresponsive polymer brushes: Comparison to other architectures. J Colloid Interface Sci 2018; 526:429-450. [DOI: 10.1016/j.jcis.2018.04.086] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Revised: 04/20/2018] [Accepted: 04/23/2018] [Indexed: 02/06/2023]
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11
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Wen P, Sun Y, Gao Y. Adsorption and Surface Properties of Mixtures of Fatty Acid Methyl Ester Ethoxylates and Sodium Dodecylbenzene Sulfonate. TENSIDE SURFACT DET 2018. [DOI: 10.3139/113.110575] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
Adsorption behavior of mixtures of fatty acid methyl ester ethoxylates (FMEE) and sodium dodecylbenzene sulfonate (LAS) was studied and the adsorption parameters were calculated. The critical micelle concentration (CMC) and surface tension were measured by Wilhelmy plate method. Physicochemical properties of the mixtures were also investigated, such as cloud point and foaming property. The results show that the CMC of LAS was much higher than that of FMEE and decreased significantly by adding a low quantity of FMEE, while a powerful interaction between FMEE and LAS molecules in the micelles and the surface adsorption layer was exhibited. The cloud point and foaming property of the mixtures increased with increasing LAS content. An obvious change of the physical form of LAS solution by adding FMEE was observed.
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Affiliation(s)
- Pengpeng Wen
- Sinolight Surfactants Technology Co. , Ltd., Technology department, Shanghai , China
| | - Yongqiang Sun
- China Research Institute of Daily Chemical Industry , Technology department, Taiyuan , China
| | - Yuyang Gao
- Sinolight Surfactants Technology Co. , Ltd., Technology department, Shanghai , China
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12
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Amphiphilic comb-like pentablock copolymers of Pluronic L64 and poly(ethylene glycol)methyl ether methacrylate: synthesis by ATRP, self-assembly, and clouding behavior. IRANIAN POLYMER JOURNAL 2018. [DOI: 10.1007/s13726-018-0610-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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13
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Sharma S, Kamil M. Studies on the Interaction Between Polyethylene Oxide and Cationic Gemini/Conventional Surfactants. Chem Ind 2017. [DOI: 10.1080/00194506.2017.1289128] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Shikha Sharma
- Department of Petroleum Studies, Aligarh Muslim University, Aligarh 202002, India
| | - Mohammad Kamil
- Department of Petroleum Studies, Aligarh Muslim University, Aligarh 202002, India
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14
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Thakkar K, Bharatiya B, Ray D, Aswal VK, Bahadur P. Molecular interactions involving aqueous Triton X-100 micelles and anionic surfactants: Investigations on surface activity and morphological transitions. J Mol Liq 2016. [DOI: 10.1016/j.molliq.2016.08.086] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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15
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Quinn MDJ, Vu K, Madden S, Notley SM. Photothermal Breaking of Emulsions Stabilized with Graphene. ACS APPLIED MATERIALS & INTERFACES 2016; 8:10609-10616. [PMID: 27054548 DOI: 10.1021/acsami.6b00737] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Pristine graphene particles prepared using an aqueous phase exfoliation technique have been used to promote the stabilization of emulsions through adsorption at the oil-water interface. Highly localized phase separation of these ultrastable emulsions could, however, be induced through photothermal heating of the graphene particles at the interface exposed to near-infrared light. The graphene wettability, which is a key determinant in preventing droplet coalescence was altered through the adsorption of nonionic block copolymer surfactants. Varying the aqueous solution conditions influenced the hydration of the hydrophilic component of the surfactant providing a further opportunity to alter the overall particle wettability and, hence, stability of the emulsion. In this way, highly stable-oil-in water emulsions were produced with decane; however, water-in-oil emulsions were formed with toluene as the oil phase.
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Affiliation(s)
- Matthew D J Quinn
- Department of Applied Mathematics, Research School of Physics and Engineering, Australian National University , Canberra 0200, Australia
| | - Khu Vu
- Laser Physics Centre, Research School of Physics and Engineering, Australian National University , Canberra 0200, Australia
| | - Stephen Madden
- Laser Physics Centre, Research School of Physics and Engineering, Australian National University , Canberra 0200, Australia
| | - Shannon M Notley
- Department of Applied Mathematics, Research School of Physics and Engineering, Australian National University , Canberra 0200, Australia
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16
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Pillai SA, Lee CF, Ray D, Aswal VK, Pal H, Chen LJ, Bahadur P. Microstructure of copolymeric micelles modulated by ionic liquids: investigating the role of the anion and cation. RSC Adv 2016. [DOI: 10.1039/c6ra17016a] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The addition of ionic liquids significantly alters the micellization behaviour of, and has a profound effect on, the micelles of T1304.
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Affiliation(s)
- Sadafara A. Pillai
- Department of Chemistry
- Veer Narmad South Gujarat University
- Surat 395007
- India
| | - Chin-Fen Lee
- Department of Chemical Engineering
- National Taiwan University
- Taipei 10617
- Taiwan
| | - Debes Ray
- Solid State Physics Divn
- Bhabha Atomic Research Centre
- Mumbai 400 085
- India
| | - Vinod K. Aswal
- Solid State Physics Divn
- Bhabha Atomic Research Centre
- Mumbai 400 085
- India
| | - Haridas Pal
- Radiation and Photochem. Divn
- Bhabha Atomic Research Centre
- Mumbai 400085
- India
| | - Li-Jen Chen
- Department of Chemical Engineering
- National Taiwan University
- Taipei 10617
- Taiwan
| | - Pratap Bahadur
- Department of Chemistry
- Veer Narmad South Gujarat University
- Surat 395007
- India
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17
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Grilo AL, Raquel Aires-Barros M, Azevedo AM. Partitioning in Aqueous Two-Phase Systems: Fundamentals, Applications and Trends. SEPARATION AND PURIFICATION REVIEWS 2014. [DOI: 10.1080/15422119.2014.983128] [Citation(s) in RCA: 93] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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18
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Khimani M, Parekh P, Aswal VK, Bahadur P. Interaction, solubilization and location of p-hydroxybenzoic acid and its sodium salt in micelles of moderately hydrophilic PEO-PPO-PEO triblock copolymers. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2014; 37:38. [PMID: 24853632 DOI: 10.1140/epje/i2014-14038-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Revised: 04/15/2014] [Accepted: 04/25/2014] [Indexed: 06/03/2023]
Abstract
Micelles of ABA type triblock copolymers (where A is polyethylene oxide PEO and B is polypropylene oxide PPO) viz. Pluronic® P103, P104 and P105 (each containing almost the same PPO mol wt. ~ 3250 g/mol and 30, 40 and 50 wt.% of PEO, respectively) in the presence of p -hydroxybenzoic acid (PHBA) and its sodium salt (Na-PHBA) were examined by viscosity, dynamic light scattering (DLS), small angle neutron scattering (SANS) and NMR. Spherical polymeric micelles (apparent hydrodynamic diameter ~ 20 nm) in water at 30 °C grow in the presence of PHBA and transform into prolate-ellipsoidal shape with an increased aggregation number. The micellar transition was favored at higher PHBA concentration, temperature and for copolymers with more hydrophobicity. The PHBA salt, however, increased cloud point and showed only a marginal decrease in aggregation number even at much higher concentrations. The location of PHBA in micelle was elucidated by nuclear Overhauser enhancement spectroscopy (NOESY).
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Affiliation(s)
- Mehul Khimani
- Department of Chemistry, Veer Narmad South Gujarat University, 395 007, Surat, India,
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19
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Mushtaq M, Tan IM, Ismail L, Lee SYC, Nadeem M, Sagir M. Oleate Ester-Derived Nonionic Surfactants: Synthesis and Cloud Point Behavior Studies. J DISPER SCI TECHNOL 2014. [DOI: 10.1080/01932691.2013.783492] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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20
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Parmar A, Chavda S, Bahadur P. Pluronic–cationic surfactant mixed micelles: Solubilization and release of the drug hydrochlorothiazide. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2013.09.018] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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21
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Chung CYS, Yam VWW. Dual pH- and Temperature-Responsive Metallosupramolecular Block Copolymers with Tunable Critical Micelle Temperature by Modulation of the Self-Assembly of NIR-Emissive Alkynylplatinum(II) Complexes Induced by Changes in Hydrophilicity and Electrostatic Ef. Chemistry 2013; 19:13182-92. [DOI: 10.1002/chem.201301547] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2013] [Indexed: 12/18/2022]
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22
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Sharma R, Murali R, Murthy CN. Clouding and Aggregation Behavior of PPO-PEO-PPO Triblock Copolymer (Pluronic®25R4) in Surfactant Additives Environment. TENSIDE SURFACT DET 2013. [DOI: 10.3139/113.110175] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
Aqueous solutions of commercially available Pluronic®R i. e. triblock copolymer composed of polypropylene oxide(PPO)-polyethylene oxide(PEO)-polypropylene oxide(PPO), (code named 25R4, BASF) in the presence of surfactant additives viz. hydrotropes (NaTS, NaXS), anionics (SDS, SDBS) and cationics (DTAB, CTAB) were investigated by cloud point(CP), surface tension and conductance techniques. All the techniques clearly indicated that Pluronic®25R4 interacts strongly with anionic surfactants but weakly with cationic surfactants. Surfactant additives used here, produced a marked increase in the CP of the copolymer. Elevation in CP is attributed to the solubility of PPO block of the copolymer and formation of Pluronic-surfactant complex. The effect of NaCl salt on the CP of Pluronic®25R4 at added SDS and CTAB was also studied and it was decreased due to the screening effect. At the presence of 25R4 in its non-associated form, the surface tension and conductance data is discussed with binding process and indicated strong interaction of Pluronic®25R4 with SDS, showing two break points (P1 and P2) in the plot and very weak interaction with CTAB observing single break point.
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23
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Tebaldi ML, Fiel LA, Santos AM, Guterres SS, Pohlmann AR. New Approach to Determine the Phase Transition Temperature, Cloud Point, of Thermoresponsive Polymers. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2013. [DOI: 10.1080/10601325.2013.784171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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24
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Rocha SAN, Costa CR, Celino JJ, Teixeira LSG. Effect of Additives on the Cloud Point of the Octylphenol Ethoxylate (30EO) Nonionic Surfactant. J SURFACTANTS DETERG 2012. [DOI: 10.1007/s11743-012-1421-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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25
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Ghaouar N, Henda MB, Aschi A, Gharbi A. Study of PEO—PPO—PEO Copolymers Conformational Changes: Viscosity and Dynamic Light Scattering Measurements. J MACROMOL SCI B 2011. [DOI: 10.1080/00222348.2011.557629] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- N. Ghaouar
- a Laboratoire de Physique de la Matière Molle , Faculté des Sciences de Tunis, Campus Universitaire , Tunisia
- b Institut National des Sciences Appliquées et de Technologie , INSAT, Centre Urbain Nord , Tunis, Tunisia
| | - M. Ben Henda
- a Laboratoire de Physique de la Matière Molle , Faculté des Sciences de Tunis, Campus Universitaire , Tunisia
| | - A. Aschi
- a Laboratoire de Physique de la Matière Molle , Faculté des Sciences de Tunis, Campus Universitaire , Tunisia
| | - A. Gharbi
- a Laboratoire de Physique de la Matière Molle , Faculté des Sciences de Tunis, Campus Universitaire , Tunisia
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26
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Effects of ageing conditions and block copolymer concentration on the stability and micellization of P123-Ti4+ sols prepared by the templating method. RESEARCH ON CHEMICAL INTERMEDIATES 2010. [DOI: 10.1007/s11164-010-0204-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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27
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Wang Z, Feng H. Double cloud point of ethylene oxide–propylene oxide triblock copolymer in an aqueous solution. Colloids Surf A Physicochem Eng Asp 2010. [DOI: 10.1016/j.colsurfa.2010.03.048] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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28
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Patel T, Bahadur P, Mata J. The clouding behaviour of PEO–PPO based triblock copolymers in aqueous ionic surfactant solutions: A new approach for cloud point measurements. J Colloid Interface Sci 2010; 345:346-50. [DOI: 10.1016/j.jcis.2010.01.079] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2009] [Revised: 01/25/2010] [Accepted: 01/27/2010] [Indexed: 10/19/2022]
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29
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Baloch MK, Rauf A, Ahmad F, Durani GF, Hameed G. Investigating the micellization behavior of cetyltrimethylammonium bromide: As affected by the contents of poly(ethylene oxide) and temperature of the system. J Appl Polym Sci 2010. [DOI: 10.1002/app.31822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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30
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Nandni D, Vohra KK, Mahajan RK. Study of micellar and phase separation behavior of mixed systems of triblock polymers. J Colloid Interface Sci 2009; 338:420-7. [DOI: 10.1016/j.jcis.2009.06.038] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2009] [Revised: 06/15/2009] [Accepted: 06/16/2009] [Indexed: 11/30/2022]
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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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