Dielectric Properties in Oriented and Unoriented Membranes Based on Poly(Epichlorohydrin-co-Ethylene Oxide) Copolymers: Part III
The dielectric spectra and conductivity properties of neat poly(epichlorohydrin-co-ethylene oxide)(PECH-co-EO) copolymer and two modified copolymers with a 20% or 40% of dendron 3,4,5-tris[4-(<i>n</i>-dodecan-1-yloxy)benzyloxy] benzoate units were analysed. A process of thermal orientati...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-03-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/14/7/1369 |
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| author | B. Pascual-Jose Alireza Zare Silvia De la Flor José Antonio Reina M. Giamberini A. Ribes-Greus |
| author_facet | B. Pascual-Jose Alireza Zare Silvia De la Flor José Antonio Reina M. Giamberini A. Ribes-Greus |
| author_sort | B. Pascual-Jose |
| collection | DOAJ |
| description | The dielectric spectra and conductivity properties of neat poly(epichlorohydrin-co-ethylene oxide)(PECH-co-EO) copolymer and two modified copolymers with a 20% or 40% of dendron 3,4,5-tris[4-(<i>n</i>-dodecan-1-yloxy)benzyloxy] benzoate units were analysed. A process of thermal orientation was applied to the copolymers to fine-tune the molecular motion of the side chains and determine their validity for cation transport materials. The study was conducted using Dielectric Thermal Analysis (DETA). The spectra of the modified unoriented and oriented copolymers consisted of five dielectric relaxations (δ, γ, β, α<sub>Tg</sub>, and α<sub>melting</sub>). The analysis of the relaxations processes shows that as the grafting with the dendron units increases, both the lateral and main chains have a greater difficulty moving. The thermal orientation induces in the main chain partial crystallization, including the polyether segments, and modifies the cooperative motion of the main chain associated with the glass transition (<i>α<sub>Tg</sub></i>)<i><sub>. </sub></i>A deep analysis of the electrical loss modulus revealed that the degree of modification only modifies the temperature peak of each relaxation, and this effect is more perceived if the dendron unit content is higher (40%). The thermal orientation process seems equal to the spectra of CP20-O and CP40-O to the point that the degree of modification does not matter. Nevertheless, the fragility index denotes the differences in the molecular motion between both copolymers (40% and 20%) due to the thermal orientation. The study of the electric conductivity showed that the ideal long-range pathways were being altered by neither the thermal orientation process nor the addition of dendrimers. The analysis of the through-plane proton conductivity confirmed that the oriented copolymer with the highest concentration of dendrimers was the best performer and the most suitable copolymer for proton transport materials. |
| first_indexed | 2024-03-09T11:30:48Z |
| format | Article |
| id | doaj.art-b2d589b7283341d2a0362e194d4305b4 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-09T11:30:48Z |
| publishDate | 2022-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-b2d589b7283341d2a0362e194d4305b42023-11-30T23:53:30ZengMDPI AGPolymers2073-43602022-03-01147136910.3390/polym14071369Dielectric Properties in Oriented and Unoriented Membranes Based on Poly(Epichlorohydrin-co-Ethylene Oxide) Copolymers: Part IIIB. Pascual-Jose0Alireza Zare1Silvia De la Flor2José Antonio Reina3M. Giamberini4A. Ribes-Greus5Institute of Technology of Materials (ITM), Universitat Politècnica de València (UPV), 46022 Camí de Vera, SpainDepartment of Chemical Engineering (DEQ), Universitat Rovira I Virgili, Av. Païssos Catalans, 26, 43007 Tarragona, SpainDepartment of Mechanical Engineering, Universitat Rovira i Virgili (URV), Av. Països Catalans, 26, 43007 Tarragona, SpainDepartment of Analytical Chemistry and Organic Chemistry, Universitat Rovira i Virgili (URV), C/Marcel.lí Domingo s/n, 43007 Tarragona, SpainDepartment of Chemical Engineering (DEQ), Universitat Rovira I Virgili, Av. Païssos Catalans, 26, 43007 Tarragona, SpainInstitute of Technology of Materials (ITM), Universitat Politècnica de València (UPV), 46022 Camí de Vera, SpainThe dielectric spectra and conductivity properties of neat poly(epichlorohydrin-co-ethylene oxide)(PECH-co-EO) copolymer and two modified copolymers with a 20% or 40% of dendron 3,4,5-tris[4-(<i>n</i>-dodecan-1-yloxy)benzyloxy] benzoate units were analysed. A process of thermal orientation was applied to the copolymers to fine-tune the molecular motion of the side chains and determine their validity for cation transport materials. The study was conducted using Dielectric Thermal Analysis (DETA). The spectra of the modified unoriented and oriented copolymers consisted of five dielectric relaxations (δ, γ, β, α<sub>Tg</sub>, and α<sub>melting</sub>). The analysis of the relaxations processes shows that as the grafting with the dendron units increases, both the lateral and main chains have a greater difficulty moving. The thermal orientation induces in the main chain partial crystallization, including the polyether segments, and modifies the cooperative motion of the main chain associated with the glass transition (<i>α<sub>Tg</sub></i>)<i><sub>. </sub></i>A deep analysis of the electrical loss modulus revealed that the degree of modification only modifies the temperature peak of each relaxation, and this effect is more perceived if the dendron unit content is higher (40%). The thermal orientation process seems equal to the spectra of CP20-O and CP40-O to the point that the degree of modification does not matter. Nevertheless, the fragility index denotes the differences in the molecular motion between both copolymers (40% and 20%) due to the thermal orientation. The study of the electric conductivity showed that the ideal long-range pathways were being altered by neither the thermal orientation process nor the addition of dendrimers. The analysis of the through-plane proton conductivity confirmed that the oriented copolymer with the highest concentration of dendrimers was the best performer and the most suitable copolymer for proton transport materials.https://www.mdpi.com/2073-4360/14/7/1369broadband dielectric spectroscopydielectric relaxation spectramacromolecular cooperativitysegmental dynamicspoly(epichlorohydrin-co-ethylene oxide)electrical and protonic conductivity |
| spellingShingle | B. Pascual-Jose Alireza Zare Silvia De la Flor José Antonio Reina M. Giamberini A. Ribes-Greus Dielectric Properties in Oriented and Unoriented Membranes Based on Poly(Epichlorohydrin-co-Ethylene Oxide) Copolymers: Part III Polymers broadband dielectric spectroscopy dielectric relaxation spectra macromolecular cooperativity segmental dynamics poly(epichlorohydrin-co-ethylene oxide) electrical and protonic conductivity |
| title | Dielectric Properties in Oriented and Unoriented Membranes Based on Poly(Epichlorohydrin-co-Ethylene Oxide) Copolymers: Part III |
| title_full | Dielectric Properties in Oriented and Unoriented Membranes Based on Poly(Epichlorohydrin-co-Ethylene Oxide) Copolymers: Part III |
| title_fullStr | Dielectric Properties in Oriented and Unoriented Membranes Based on Poly(Epichlorohydrin-co-Ethylene Oxide) Copolymers: Part III |
| title_full_unstemmed | Dielectric Properties in Oriented and Unoriented Membranes Based on Poly(Epichlorohydrin-co-Ethylene Oxide) Copolymers: Part III |
| title_short | Dielectric Properties in Oriented and Unoriented Membranes Based on Poly(Epichlorohydrin-co-Ethylene Oxide) Copolymers: Part III |
| title_sort | dielectric properties in oriented and unoriented membranes based on poly epichlorohydrin co ethylene oxide copolymers part iii |
| topic | broadband dielectric spectroscopy dielectric relaxation spectra macromolecular cooperativity segmental dynamics poly(epichlorohydrin-co-ethylene oxide) electrical and protonic conductivity |
| url | https://www.mdpi.com/2073-4360/14/7/1369 |
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