1
|
Zhang Y, Wen G, Giaouzi D, Pispas S, Li J. Closely Packed Core-Shell Micelle Structures of Double Hydrophilic Miktoarm Star Copolymers at the Air-Water Interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:8284-8290. [PMID: 38567402 DOI: 10.1021/acs.langmuir.4c00437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
The aggregation behavior of amphiphilic block copolymers at the air-water interface has been extensively studied, but less attention was given to that of star copolymers. In this work, we studied the interfacial aggregation behavior of two double hydrophilic pH- and temperature-responsive miktoarm star copolymers of poly[di(ethylene glycol) methyl ether methacrylate]-poly[2-(dimethylamino)ethyl methacrylate] (PDEGMA3-PDMAEMA3 and PDEGMA4-PDMAEMA7, the subscripts denote arm numbers) with different molecular weights. The effects of subphase pH and temperature on the monolayer isotherms and hysteresis curves of the two star copolymers and the morphologies of their Langmuir-Blodgett (LB) films were studied by the Langmuir film balance technique and atomic force microscopy, respectively. At the air-water interface, the two star copolymers tend to form closely packed micelles. These micelles exhibit a core-shell structure, where the small hydrophobic core consists of cross-linker of ethylene glycol dimethacrylate (EGDMA) and the carbon backbones of PDEGMA and PDMAEMA arms and the short hydrophilic shell is composed of di(ethylene glycol) and tertiary amine side groups. With increasing subphase pH, the surface pressure versus molecular area isotherms shift toward larger mean molecular areas as a result of the enhanced interface adsorption of nonprotonated tertiary amine groups. The isotherm shift of PDEGMA3-PDMAEMA3 monolayers is primarily attributed to high density of tertiary amine groups in the shells, while that of PDEGMA4-PDMAEMA7 is mainly attributed to high density of di(ethylene glycol) groups in the shells. The hysteresis degrees in the monolayers of the two copolymers under alkaline and neutral conditions are greater than those under acidic conditions due to the decreased protonation degree of the tertiary amine groups. At 10 °C, the mobility of the shells is poor and the isotherms are located on the right. Above the lower critical solution temperature, di(ethylene glycol) groups contract, which causes a slight shift of the isotherms toward smaller mean molecular areas.
Collapse
Affiliation(s)
- Yu Zhang
- Department of Polymer Materials and Engineering, College of Material Science and Chemical Engineering, Harbin University of Science and Technology, 4 Linyuan Road, Harbin 150040, People's Republic of China
| | - Gangyao Wen
- Department of Polymer Materials and Engineering, College of Material Science and Chemical Engineering, Harbin University of Science and Technology, 4 Linyuan Road, Harbin 150040, People's Republic of China
| | - Despoina Giaouzi
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, Athens 11635, Greece
| | - Stergios Pispas
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, Athens 11635, Greece
| | - Jian Li
- Department of Polymer Materials and Engineering, College of Material Science and Chemical Engineering, Harbin University of Science and Technology, 4 Linyuan Road, Harbin 150040, People's Republic of China
| |
Collapse
|
2
|
Ghosh R, Das S, Bhattacharyya K, Chatterjee DP, Biswas A, Nandi AK. Light-Induced Conformational Change of Uracil-Anchored Polythiophene-Regulating Thermo-Responsiveness. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:12401-12411. [PMID: 30234308 DOI: 10.1021/acs.langmuir.8b02679] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Tuning the electronic structure of a π-conjugated polymer from the responsive side chains is generally done to get desired optoelectronic properties, and it would be very fruitful when light is used as an exciting tool that can also affect the backbone chain conformation. For this purpose, polythiophene- g-poly-[ N-(6-methyluracilyl)- N, N-dimethylamino chloride]ethyl methacrylate (PTDU) is synthesized. On exposure to diffuse sunlight, the uracil moieties of the grafted chains cause the absorption maximum of PTDU solution to show gradual blue shift of 87 nm and a gradual blue shift of 46 nm in the emission maximum, quenching its fluorescence with time. These effects occur specifically at the absorption range of polythiophene (PT) chromophore on direct exposure of light of different wavelengths, and the optimum wavelength is found to be 420 nm. Impedance study suggests a decrease in charge transfer resistance upon exposure because of conformational change of PTDU. Theoretical study indicates that on exposure to visible light, uracil moieties move toward the backbone to facilitate photoinduced electron transfer between the PT and the uracil, attributing to the variation in optoelectronic properties. Morphological and light-scattering studies exhibit a decrease in particle size because of coiling of the PT backbone and squeezing of the grafted chain on light exposure. The transparent orange-colored PTDU solution becomes hazy with a hike in emission intensity on addition of sodium halides and becomes reversibly transparent or hazy on heating or cooling. The screening of cationic centers of PTDU by varying halide anion concentration tunes the phase transition temperature. Thus, the light-induced variation in the backbone conformation is responsible for tuning the optoelectronic properties and regulates the thermos-responsiveness of the PTDU solution in the presence of halide ions.
Collapse
Affiliation(s)
- Radhakanta Ghosh
- Polymer Science Unit , Indian Association for the Cultivation of Science , Jadavpur , Kolkata 700 032 , India
| | - Sujoy Das
- Polymer Science Unit , Indian Association for the Cultivation of Science , Jadavpur , Kolkata 700 032 , India
| | - Kalishankar Bhattacharyya
- Polymer Science Unit , Indian Association for the Cultivation of Science , Jadavpur , Kolkata 700 032 , India
| | - Dhruba P Chatterjee
- Polymer Science Unit , Indian Association for the Cultivation of Science , Jadavpur , Kolkata 700 032 , India
| | - Atosi Biswas
- Polymer Science Unit , Indian Association for the Cultivation of Science , Jadavpur , Kolkata 700 032 , India
| | - Arun K Nandi
- Polymer Science Unit , Indian Association for the Cultivation of Science , Jadavpur , Kolkata 700 032 , India
| |
Collapse
|
3
|
Basak U, Ghosh R, Ghosh T, Majumdar S, Pakhira M, Ghosh T, Chatterjee DP. Synthesis of ‘living’ poly(2-dimethylaminoethyl methacrylate) and stimuli responsive/multifunctional block copolymers effective in fabrication of CdS ‘smart’ ‘Q-Particles’. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.09.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
4
|
Zhong Q, Mi L, Metwalli E, Bießmann L, Philipp M, Miasnikova A, Laschewsky A, Papadakis CM, Cubitt R, Schwartzkopf M, Roth SV, Wang J, Müller-Buschbaum P. Effect of chain architecture on the swelling and thermal response of star-shaped thermo-responsive (poly(methoxy diethylene glycol acrylate)-block-polystyrene) 3 block copolymer films. SOFT MATTER 2018; 14:6582-6594. [PMID: 30052259 DOI: 10.1039/c8sm00965a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The effect of chain architecture on the swelling and thermal response of thin films obtained from an amphiphilic three-arm star-shaped thermo-responsive block copolymer poly(methoxy diethylene glycol acrylate)-block-polystyrene ((PMDEGA-b-PS)3) is investigated by in situ neutron reflectivity (NR) measurements. The PMDEGA and PS blocks are micro-phase separated with randomly distributed PS nanodomains. The (PMDEGA-b-PS)3 films show a transition temperature (TT) at 33 °C in white light interferometry. The swelling capability of the (PMDEGA-b-PS)3 films in a D2O vapor atmosphere is better than that of films from linear PS-b-PMDEGA-b-PS triblock copolymers, which can be attributed to the hydrophilic end groups and limited size of the PS blocks in (PMDEGA-b-PS)3. However, the swelling kinetics of the as-prepared (PMDEGA-b-PS)3 films and the response of the swollen film to a temperature change above the TT are significantly slower than that in the PS-b-PMDEGA-b-PS films, which may be related to the conformation restriction by the star-shape. Unlike in the PS-b-PMDEGA-b-PS films, the amount of residual D2O in the collapsed (PMDEGA-b-PS)3 films depends on the final temperature. It decreases from (9.7 ± 0.3)% to (7.0 ± 0.3)% or (6.0 ± 0.3)% when the final temperatures are set to 35 °C, 45 °C and 50 °C, respectively. This temperature-dependent reduction of embedded D2O originates from the hindrance of chain conformation from the star-shaped chain architecture.
Collapse
Affiliation(s)
- Qi Zhong
- Key Laboratory of Advanced Textile Materials & Manufacturing Technology, Ministry of Education, Engineering Research Center for Eco-Dyeing & Finishing of Textiles, Ministry of Education, National Base for International Science and Technology Cooperation in Textiles and Consumer-Goods Chemistry, Zhejiang Sci-Tech University, 310018 Hangzhou, China. and Technische Universität München, Physik-Department, Lehrstuhl für Funktionelle Materialien/Fachgebiet Physik Weicher Materie, James-Franck-Str. 1, 85748 Garching, Germany.
| | - Lei Mi
- Key Laboratory of Advanced Textile Materials & Manufacturing Technology, Ministry of Education, Engineering Research Center for Eco-Dyeing & Finishing of Textiles, Ministry of Education, National Base for International Science and Technology Cooperation in Textiles and Consumer-Goods Chemistry, Zhejiang Sci-Tech University, 310018 Hangzhou, China.
| | - Ezzeldin Metwalli
- Technische Universität München, Physik-Department, Lehrstuhl für Funktionelle Materialien/Fachgebiet Physik Weicher Materie, James-Franck-Str. 1, 85748 Garching, Germany.
| | - Lorenz Bießmann
- Technische Universität München, Physik-Department, Lehrstuhl für Funktionelle Materialien/Fachgebiet Physik Weicher Materie, James-Franck-Str. 1, 85748 Garching, Germany.
| | - Martine Philipp
- Technische Universität München, Physik-Department, Lehrstuhl für Funktionelle Materialien/Fachgebiet Physik Weicher Materie, James-Franck-Str. 1, 85748 Garching, Germany.
| | - Anna Miasnikova
- Universität Potsdam, Institut für Chemie, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm, Germany
| | - Andre Laschewsky
- Universität Potsdam, Institut für Chemie, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm, Germany and Fraunhofer Institut für Angewandte Polymerforschung, Geiselbergstr. 69, 14476 Potsdam-Golm, Germany
| | - Christine M Papadakis
- Technische Universität München, Physik-Department, Lehrstuhl für Funktionelle Materialien/Fachgebiet Physik Weicher Materie, James-Franck-Str. 1, 85748 Garching, Germany.
| | - Robert Cubitt
- Institut Laue-Langevin, 6 rue Jules Horowitz, 38000 Grenoble, France
| | - Matthias Schwartzkopf
- Deutsches Elektronen-Synchrotron (DESY), Photon Science, Notkestr. 85, 22607 Hamburg, Germany
| | - Stephan V Roth
- Deutsches Elektronen-Synchrotron (DESY), Photon Science, Notkestr. 85, 22607 Hamburg, Germany and KTH Royal Institute of Technology, Department of Fibre and Polymer Technology, Teknikringen 56-58, SE-100 44 Stockholm, Sweden
| | - Jiping Wang
- Key Laboratory of Advanced Textile Materials & Manufacturing Technology, Ministry of Education, Engineering Research Center for Eco-Dyeing & Finishing of Textiles, Ministry of Education, National Base for International Science and Technology Cooperation in Textiles and Consumer-Goods Chemistry, Zhejiang Sci-Tech University, 310018 Hangzhou, China.
| | - Peter Müller-Buschbaum
- Technische Universität München, Physik-Department, Lehrstuhl für Funktionelle Materialien/Fachgebiet Physik Weicher Materie, James-Franck-Str. 1, 85748 Garching, Germany.
| |
Collapse
|