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Costa T, Knaapila M, Stewart B, Ramos ML, Justino LLG, Valente AJM, Dalgliesh R, Rogers SE, Kraft M, Allard S, Scherf U, Burrows HD. Nanostructuring with Surfactants: The Self-Assembly of a New Poly(thiophene-phenylene) Conjugated Polymer Bearing Azacrown Ether Pendant Groups. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:11845-11859. [PMID: 36121768 DOI: 10.1021/acs.langmuir.2c01246] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
We report the synthesis of a new conjugated polymer bearing crown ether moieties, poly[(N(1-aza-[18]crown-6)carbamido)thiophene-2,5-diyl-alt-1,4-phenylene] (BG2). In water, BG2 forms a dispersion with a slightly cloudy appearance. We have studied the effect of adding surfactants, with different polar head groups, on these polymer-polymer aggregates. Special attention is given to the system with the anionic surfactant, sodium dodecyl sulfate (SDS). The combination of photophysical techniques with electrical conductivity, NMR (1H, 13C, and 27Na), DFT calculations, molecular dynamics simulations, and small-angle neutron scattering (SANS) provides a detailed picture on the behavior of the SDS/BG2 system in aqueous solution and in thin films. NMR, electric conductivity, and DFT results suggest that hydrophilic interactions occur between the polar headgroup of the surfactant (OSO3- Na+) and the aza-[18]-crown-6 moiety. DFT calculations confirmed the capability of BG2 to form stable complexes with the Na+ cations, where the cation can be either inside the azacrown cavity or sandwiched between the cavity and the polymer chain, which seem to determine the position of the surfactant hydrocarbon chain and, therefore, be responsible for the disruption of the BG2 aggregates and subsequent increase in the photoluminescence quantum yields. SANS measurements, made with hydrogenated and deuterated SDS in D2O, clearly show how micron-sized aggregates of BG2 are broken down by SDS and then how BG2 becomes preferentially incorporated within joint colloidal particles of BG2 and SDS with increasing [SDS]/[BG2] molar ratio.
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Affiliation(s)
- Telma Costa
- Department of Chemistry, University of Coimbra, CQC-IMS, Coimbra P-3004-535, Portugal
| | - Matti Knaapila
- Department of Physics, Norwegian University of Science and Technology, 7491 Trondheim, Norway
| | - Beverly Stewart
- Polymer and Biomaterials Chemistry Laboratories, School of Chemistry and Biosciences, University of Bradford, Bradford BD7 1DP, United Kingdom
| | - M Luísa Ramos
- Department of Chemistry, University of Coimbra, CQC-IMS, Coimbra P-3004-535, Portugal
| | - Licinia L G Justino
- Department of Chemistry, University of Coimbra, CQC-IMS, Coimbra P-3004-535, Portugal
| | - Artur J M Valente
- Department of Chemistry, University of Coimbra, CQC-IMS, Coimbra P-3004-535, Portugal
| | - Robert Dalgliesh
- Rutherford Appleton Laboratory, ISIS STFC, Chilton, Oxfordshire OX11 0QX, United Kingdom
| | - Sarah E Rogers
- Rutherford Appleton Laboratory, ISIS STFC, Chilton, Oxfordshire OX11 0QX, United Kingdom
| | - Mario Kraft
- Macromolecular Chemistry Group (buwmacro), Bergische Universität Wuppertal, Gauß-Strasse. 20, 42097 Wuppertal, Germany
| | - Sybille Allard
- Macromolecular Chemistry Group (buwmacro), Bergische Universität Wuppertal, Gauß-Strasse. 20, 42097 Wuppertal, Germany
| | - Ullrich Scherf
- Macromolecular Chemistry Group (buwmacro), Bergische Universität Wuppertal, Gauß-Strasse. 20, 42097 Wuppertal, Germany
| | - Hugh D Burrows
- Department of Chemistry, University of Coimbra, CQC-IMS, Coimbra P-3004-535, Portugal
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Enhanced water absorption of tissue paper by cross-linking cellulose with poly(vinyl alcohol). CHEMICAL PAPERS 2022; 76:4497-4507. [PMID: 35431412 PMCID: PMC8992785 DOI: 10.1007/s11696-022-02188-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Accepted: 03/20/2022] [Indexed: 01/30/2023]
Abstract
Abstract Tissue paper was the only paper grade whose consumption increased during 2020 in Europe. In a highly competitive context, this work explores a strategy based on bisacrylamide cross-linkers and poly(vinyl alcohol) (PVA), seeking to enhance the water uptake of pulps for tissue paper and the key properties of the resulting tissue sheets: water absorption capacity, capillarity, softness, porosity, and strength. For that, α-cellulose from cotton and a kraft hardwood pulp, in parallel, were reacted with N,N’-methylenebisacrylamide, both in the absence and in the presence of PVA. The water desorption rate of the modified polymers was monitored. Pulp blends were then mixed with a conventional softwood pulp (30%) to prepare laboratory tissue paper sheets (20 g m–2). For cotton cellulose, cross-linking with PVA more than doubled the water uptake, up to 7.3 g/g. A significant enhancement was also obtained in the case of pulps, up to 9.6 g/g, and in the case of paper, to 11.9 g/g. This improvement was consistent with a drastic increase in porosity, and it was not detrimental to paper strength. Graphical Abstract ![]()
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Qi Z, Gao D, Zhu Z, He Z, Bai G. Regulating Optical Properties of Water-Soluble Conjugated Polythiophene with Polyvinyl Alcohol. ACTA CHIMICA SINICA 2022. [DOI: 10.6023/a22010013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Filho CMC, Bueno PVA, Matsushita AFY, Vilsinski BH, Rubira AF, Muniz EC, Murtinho DMB, Valente AJM. Uncommon Sorption Mechanism of Aromatic Compounds onto Poly(Vinyl Alcohol)/Chitosan/Maleic Anhydride-β-Cyclodextrin Hydrogels. Polymers (Basel) 2020; 12:E877. [PMID: 32290255 PMCID: PMC7652220 DOI: 10.3390/polym12040877] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Revised: 04/06/2020] [Accepted: 04/08/2020] [Indexed: 11/24/2022] Open
Abstract
Aromatic hydrocarbons are extensive environmental pollutants occurring in both water and air media, and their removal is a priority effort for a healthy environment. The use of adsorbents is among the several strategies used for the remediation of these compounds. In this paper, we aim the synthesis of an amphiphilic hydrogel with the potential for the simultaneous sorption of a set of monocyclic and polycyclic aromatic hydrocarbons associated with toxicity effects in humans. Thus, we start by the synthesis of a copolymer-based in chitosan and β-cyclodextrin previously functionalized with the maleic anhydride. The presence of β-cyclodextrin will confer the ability to interact with hydrophobic compounds. The resulting material is posteriorly incorporated in a cryogel of poly(vinyl alcohol) matrix. We aim to improve the amphiphilic ability of the hydrogel matrix. The obtained hydrogel was characterized by swelling water kinetics, thermogravimetric analysis, rheological measurements, and scanning electron microscopy. The sorption of aromatic hydrocarbons onto the gel is characterized by pseudo-first-order kinetics and Henry isotherm, suggesting a physisorption mechanism. The results show that the presence of maleic anhydride-β-cyclodextrin and chitosan into hydrogels leads to an increase in the removal efficiency of the aromatic compounds. Additionally, the capacity of this hydrogel for removing these pollutants from a fossil fuel sample has also been tested.
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Affiliation(s)
- Cesar M. C. Filho
- Department of Chemistry, CQC, University of Coimbra, 3004-535 Coimbra, Portugal; (A.F.Y.M.); (B.H.V.); (D.M.B.M.)
- BRinova Biochemistry Lda., R. Fernanda Seno, 6, 7005-485 Évora, Portugal
| | - Pedro V. A. Bueno
- Grupo de Materiais Poliméricos e Compósitos (GMPC)-Departamento de Química, Universidade Estadual de Maringá, UEM, Maringá 87020-900, Brazil; (P.V.A.B.); (A.F.R.); (E.C.M.)
| | - Alan F. Y. Matsushita
- Department of Chemistry, CQC, University of Coimbra, 3004-535 Coimbra, Portugal; (A.F.Y.M.); (B.H.V.); (D.M.B.M.)
| | - Bruno H. Vilsinski
- Department of Chemistry, CQC, University of Coimbra, 3004-535 Coimbra, Portugal; (A.F.Y.M.); (B.H.V.); (D.M.B.M.)
- Grupo de Materiais Poliméricos e Compósitos (GMPC)-Departamento de Química, Universidade Estadual de Maringá, UEM, Maringá 87020-900, Brazil; (P.V.A.B.); (A.F.R.); (E.C.M.)
| | - Adley F. Rubira
- Grupo de Materiais Poliméricos e Compósitos (GMPC)-Departamento de Química, Universidade Estadual de Maringá, UEM, Maringá 87020-900, Brazil; (P.V.A.B.); (A.F.R.); (E.C.M.)
| | - Edvani C. Muniz
- Grupo de Materiais Poliméricos e Compósitos (GMPC)-Departamento de Química, Universidade Estadual de Maringá, UEM, Maringá 87020-900, Brazil; (P.V.A.B.); (A.F.R.); (E.C.M.)
- Post-graduate Program on Materials Science & Engineering, Federal University of Technology, Paraná (UTFPR-LD), Londrina 86036-370, Brazil
- Department of Chemistry, Federal University of Piauí, Teresina CEP 64049-550, Brazil
| | - Dina M. B. Murtinho
- Department of Chemistry, CQC, University of Coimbra, 3004-535 Coimbra, Portugal; (A.F.Y.M.); (B.H.V.); (D.M.B.M.)
| | - Artur J. M. Valente
- Department of Chemistry, CQC, University of Coimbra, 3004-535 Coimbra, Portugal; (A.F.Y.M.); (B.H.V.); (D.M.B.M.)
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Filova B, Musilova L, Mracek A, Ramos ML, Veríssimo LM, Valente AJ, Ribeiro AC. Effect of sodium salts on diffusion of poly(vinyl alcohol) in aqueous solutions. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112728] [Citation(s) in RCA: 2] [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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Nitneth DT, Hutchison JA, Ghiggino KP. Excitonic Processes in a Conjugated Polyelectrolyte Complex. Aust J Chem 2020. [DOI: 10.1071/ch19308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
In aqueous solution, a di-sulfonated phenylenevinylene polymer (DPS-PPV) forms a complex with non-ionic poly(vinyl alcohol) (PVA) leading to absorption spectroscopic shifts and a dramatic (6-fold) increase in DPS-PPV fluorescence intensity. Spectroscopic investigations demonstrate that the complexation with PVA and other neutral polymers results in conformational changes in the DPS-PPV chains that lead to the removal of non-fluorescent energy traps and results in the observed increase in fluorescence in the bulk solution. Single molecule fluorescence measurements of DPS-PPV chains dispersed on glass and in PVA films confirm that efficient exciton energy transfer occurs within each photo-excited DPS-PPV chain and that the observed increase in fluorescence intensity in the PVA film environment is also associated with fewer quenching sites. The results highlight the importance of conjugated polyelectrolyte conformation on exciton relaxation pathways.
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Filho CMC, Bueno PVA, Matsushita AFY, Rubira AF, Muniz EC, Durães L, Murtinho DMB, Valente AJM. Synthesis, characterization and sorption studies of aromatic compounds by hydrogels of chitosan blended with β-cyclodextrin- and PVA-functionalized pectin. RSC Adv 2018; 8:14609-14622. [PMID: 35540733 PMCID: PMC9079937 DOI: 10.1039/c8ra02332h] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Accepted: 04/11/2018] [Indexed: 11/21/2022] Open
Abstract
Complex coacervation of chitosan with β-cyclodextrin- and poly(vinyl alcohol)-functionalized pectin: ability for simultaneous removal of six different aromatic compounds.
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Affiliation(s)
- Cesar M. C. Filho
- CQC
- Department of Chemistry
- University of Coimbra
- 3004-535 Coimbra
- Portugal
| | - Pedro V. A. Bueno
- Grupo de Materiais Poliméricos e Compósitos (GMPC) – Departamento de Química
- Universidade Estadual de Maringá
- UEM
- Maringá
- Brazil
| | | | - Adley F. Rubira
- Grupo de Materiais Poliméricos e Compósitos (GMPC) – Departamento de Química
- Universidade Estadual de Maringá
- UEM
- Maringá
- Brazil
| | - Edvani C. Muniz
- Grupo de Materiais Poliméricos e Compósitos (GMPC) – Departamento de Química
- Universidade Estadual de Maringá
- UEM
- Maringá
- Brazil
| | - Luísa Durães
- CIEPQPF
- Department of Chemical Engineering
- University of Coimbra
- 3030-790 Coimbra
- Portugal
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