| Surface characterization of poly(lactic acid) and polycaprolactone by inverse gas chromatography. | |
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MedLine Citation:
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PMID: 17383661 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Inverse gas chromatography (IGC) has been used to characterise the surface properties of polycaprolactone (PCL) and poly(lactic acid) (PLA). The dispersive component of the surface free energy (gamma(S)(D)) was found to be very small for both of them--values close to 30 mJ/m(2) in the case of the PLA and ca. 40 mJ/m(2) for the PCL. The retention times of the n-alkanes, necessary to calculate the dispersive component of the surface energy, were obtained from the maximum, the centre at half height and the centre of mass of the chromatographic peak. While the values obtained using the first two parameters appear not to be affected by the peak asymmetry, in spite of having been obtained above the glass transition temperature of the polymer, the values obtained using the latter have been found to be not reliable. The drawbacks of using n-alkanes with a very small retention time have also been discussed, estimating the error it can introduce in the final results. Finally, the acid-base properties of the two biopolymers were determined using the approaches suggested by Schultz et al. and by St. Flour and Papirer. Although both methods describe the surfaces of PLA and PCL as neutral ones, differences between the values of the parameters K(A), K(D) and S(C) were obtained. |
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Authors:
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D Cava; R Gavara; J M Lagarón; A Voelkel |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2007-03-16 |
Journal Detail:
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Title: Journal of chromatography. A Volume: 1148 ISSN: 0021-9673 ISO Abbreviation: J Chromatogr A Publication Date: 2007 Apr |
Date Detail:
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Created Date: 2007-04-04 Completed Date: 2007-06-11 Revised Date: 2009-01-15 |
Medline Journal Info:
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Nlm Unique ID: 9318488 Medline TA: J Chromatogr A Country: Netherlands |
Other Details:
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Languages: eng Pagination: 86-91 Citation Subset: IM |
Affiliation:
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Packaging Lab., IATA-CSIC, Apdo. Correos 73, 46100 Burjassot, Spain. dcava@iata.csic.es |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Chromatography, Gas
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methods* Hydrogen-Ion Concentration Lactic Acid / analysis*, chemistry Polyesters / analysis*, chemistry Polymers / analysis*, chemistry Surface Properties |
| Chemical | |
Reg. No./Substance:
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0/Polyesters; 0/Polymers; 24980-41-4/polycaprolactone; 26100-51-6/poly(lactic acid); 50-21-5/Lactic Acid |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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