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Intra- and Intermolecular Hydrogen Bonding in Miscible Blends of CO(2)/Epoxy Cyclohexene Copolymer with Poly(Vinyl Phenol)
In this study, we synthesized a poly(cyclohexene carbonate) (PCHC) through alternative ring-opening copolymerization of CO(2) with cyclohexene oxide (CHO) mediated by a binary LZn(2)OAc(2) catalyst at a mild temperature. A two-dimensional Fourier transform infrared (2D FTIR) spectroscopy indicated t...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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MDPI
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9266814/ https://www.ncbi.nlm.nih.gov/pubmed/35806022 http://dx.doi.org/10.3390/ijms23137018 |
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author | Du, Wei-Ting Kuan, Yen-Ling Kuo, Shiao-Wei |
author_facet | Du, Wei-Ting Kuan, Yen-Ling Kuo, Shiao-Wei |
author_sort | Du, Wei-Ting |
collection | PubMed |
description | In this study, we synthesized a poly(cyclohexene carbonate) (PCHC) through alternative ring-opening copolymerization of CO(2) with cyclohexene oxide (CHO) mediated by a binary LZn(2)OAc(2) catalyst at a mild temperature. A two-dimensional Fourier transform infrared (2D FTIR) spectroscopy indicated that strong intramolecular [C–H···O=C] hydrogen bonding (H-bonding) occurred in the PCHC copolymer, thereby weakening its intermolecular interactions and making it difficult to form miscible blends with other polymers. Nevertheless, blends of PCHC with poly(vinyl phenol) (PVPh), a strong hydrogen bond donor, were miscible because intermolecular H-bonding formed between the PCHC C=O units and the PVPh OH units, as evidenced through solid state NMR and one-dimensional and 2D FTIR spectroscopic analyses. Because the intermolecular H-bonding in the PCHC/PVPh binary blends were relatively weak, a negative deviation from linearity occurred in the glass transition temperatures (T(g)). We measured a single proton spin-lattice relaxation time from solid state NMR spectra recorded in the rotating frame [T(1ρ)(H)], indicating full miscibility on the order of 2–3 nm; nevertheless, the relaxation time exhibited a positive deviation from linearity, indicating that the hydrogen bonding interactions were weak, and that the flexibility of the main chain was possibly responsible for the negative deviation in the values of T(g). |
format | Online Article Text |
id | pubmed-9266814 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-92668142022-07-09 Intra- and Intermolecular Hydrogen Bonding in Miscible Blends of CO(2)/Epoxy Cyclohexene Copolymer with Poly(Vinyl Phenol) Du, Wei-Ting Kuan, Yen-Ling Kuo, Shiao-Wei Int J Mol Sci Article In this study, we synthesized a poly(cyclohexene carbonate) (PCHC) through alternative ring-opening copolymerization of CO(2) with cyclohexene oxide (CHO) mediated by a binary LZn(2)OAc(2) catalyst at a mild temperature. A two-dimensional Fourier transform infrared (2D FTIR) spectroscopy indicated that strong intramolecular [C–H···O=C] hydrogen bonding (H-bonding) occurred in the PCHC copolymer, thereby weakening its intermolecular interactions and making it difficult to form miscible blends with other polymers. Nevertheless, blends of PCHC with poly(vinyl phenol) (PVPh), a strong hydrogen bond donor, were miscible because intermolecular H-bonding formed between the PCHC C=O units and the PVPh OH units, as evidenced through solid state NMR and one-dimensional and 2D FTIR spectroscopic analyses. Because the intermolecular H-bonding in the PCHC/PVPh binary blends were relatively weak, a negative deviation from linearity occurred in the glass transition temperatures (T(g)). We measured a single proton spin-lattice relaxation time from solid state NMR spectra recorded in the rotating frame [T(1ρ)(H)], indicating full miscibility on the order of 2–3 nm; nevertheless, the relaxation time exhibited a positive deviation from linearity, indicating that the hydrogen bonding interactions were weak, and that the flexibility of the main chain was possibly responsible for the negative deviation in the values of T(g). MDPI 2022-06-24 /pmc/articles/PMC9266814/ /pubmed/35806022 http://dx.doi.org/10.3390/ijms23137018 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Du, Wei-Ting Kuan, Yen-Ling Kuo, Shiao-Wei Intra- and Intermolecular Hydrogen Bonding in Miscible Blends of CO(2)/Epoxy Cyclohexene Copolymer with Poly(Vinyl Phenol) |
title | Intra- and Intermolecular Hydrogen Bonding in Miscible Blends of CO(2)/Epoxy Cyclohexene Copolymer with Poly(Vinyl Phenol) |
title_full | Intra- and Intermolecular Hydrogen Bonding in Miscible Blends of CO(2)/Epoxy Cyclohexene Copolymer with Poly(Vinyl Phenol) |
title_fullStr | Intra- and Intermolecular Hydrogen Bonding in Miscible Blends of CO(2)/Epoxy Cyclohexene Copolymer with Poly(Vinyl Phenol) |
title_full_unstemmed | Intra- and Intermolecular Hydrogen Bonding in Miscible Blends of CO(2)/Epoxy Cyclohexene Copolymer with Poly(Vinyl Phenol) |
title_short | Intra- and Intermolecular Hydrogen Bonding in Miscible Blends of CO(2)/Epoxy Cyclohexene Copolymer with Poly(Vinyl Phenol) |
title_sort | intra- and intermolecular hydrogen bonding in miscible blends of co(2)/epoxy cyclohexene copolymer with poly(vinyl phenol) |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9266814/ https://www.ncbi.nlm.nih.gov/pubmed/35806022 http://dx.doi.org/10.3390/ijms23137018 |
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