| ESR spin-label study of poly(styrene-co-methacrylic acid)/poly(epsilon-caprolactone) semi-interpenetrating polymer networks with controlled hydrogen-bond interactions. | |
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MedLine Citation:
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PMID: 16114101 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The morphology and miscibility of semi-interpenetrating polymer networks (semi-IPN) prepared with poly(styrene-co-methacrylic acid) [P(S-co-MAA)] of different carboxylic acid contents and poly(epsilon-caprolactone) (PCL) have been studied by ESR spin-label method. The ESR spectra of spin-labeled PCL showed one motional component at any specific temperature. It indicated that the spin-labeled molecules were located in one type of environment. The coexistence of two motional components in the ESR spectra of all semi-IPN samples was observed over a certain temperature range. This phenomenon suggested that the semi-IPNs were not compatible systems; they contained two microphases, a PCL-rich microdomain and a P(S-co-MAA)-rich microdomain. The miscibility could be improved by increasing the carboxylic acid content, which could enhance the hydrogen-bonding interactions between the ester groups of PCL and carboxylic acid groups in P(S-co-MAA). It was also found that the intracomponent cross-linking of the semi-IPNs was not in favor of the miscibility. The microphase separation occurred in all semi-IPNs, even in the samples having strong hydrogen-bonding interactions. With increasing cross-linking density, the microphase separation became more remarkable. |
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Authors:
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Furong Qiu; Shiming Chen; Zhenghua Ping; Gongming Yin |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Magnetic resonance in chemistry : MRC Volume: 43 ISSN: 0749-1581 ISO Abbreviation: Magn Reson Chem Publication Date: 2005 Nov |
Date Detail:
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Created Date: 2005-10-03 Completed Date: 2006-02-16 Revised Date: 2008-08-14 |
Medline Journal Info:
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Nlm Unique ID: 9882600 Medline TA: Magn Reson Chem Country: England |
Other Details:
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Languages: eng Pagination: 918-25 Citation Subset: IM |
Copyright Information:
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Copyright (c) 2005 John Wiley & Sons, Ltd. |
Affiliation:
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Research Center for Analysis and Measurement, Fudan University, Shanghai 200433, PR China. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Electron Spin Resonance Spectroscopy
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methods Hydrogen Bonding Methacrylates / chemical synthesis, chemistry* Molecular Structure Polyesters / chemical synthesis, chemistry* Polymers / chemistry* Polystyrenes / chemical synthesis, chemistry* Temperature |
| Chemical | |
Reg. No./Substance:
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0/Methacrylates; 0/Polyesters; 0/Polymers; 0/Polystyrenes; 24980-41-4/polycaprolactone; 79-41-4/methacrylic acid |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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