Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/320066
Type: Artigo de Periódico
Title: Effect Of Scco(2) Sorption Capacity On The Total Amount Of Borage Oil Loaded By Scco(2) Impregnation/deposition Into A Polyurethane-based Wound Dressing
Author: da Silva
CV; Pereira
VJ; Rosa
PTV; Cabral-Albuquerque
ECM; de Melo
SABV; Costa
GMN; Dias
AMA; de Sousa
HC; Braga
MEM
Abstract: In this work, experimental equilibrium solubility data of scCO(2) in polyurethane (PUR) foam (scCO(2) sorption capacity) was measured by a gravimetric method for different isotherms (308,318 and 328 K), scCO(2) densities (650,750 and 850 kg m(-3)) and scCO(2) exposure times (0.5, 2,4, 8 and 16 h). Sorption data and CO2 desorption coefficients were estimated from desorption curves that were modeled using both numerical and analytical solution of Fick's second law, with deviations below 10% in both cases. The influence of scCO(2) sorption capacity on the amount of borage oil impregnated/deposited into the PUR foamed matrix was studied for selected pressure and temperature conditions and based on scCO(2) sorption data. Results showed that the highest solubility of scCO(2) in PUR (similar to 70%) was achieved at the lowest temperature and highest solvent density studied (308 K and 850 kg m(-3)) while the highest borage oil loaded yield was observed at the highest temperature and solvent density studied (328 K and 850 kg m(-3)), meaning that the impregnation/deposition process is controlled by the solubility of borage oil in scCO(2). All the compounds present in borage oil (and which are detected by HPLC) were successfully loaded into the PUR matrix which confirms the feasibility of the impregnation/deposition process. Moreover, the amount of loaded oil did not significantly affect the neat properties of the PUR matrix (mainly its hydrophobicity, thermal resistance and water vapor permeation capacity). (C) 2016 Elsevier B.V. All rights reserved.
Subject: Scco(2) Sorption
Scco(2) Impregnation/deposition
Borage Oil
Polyurethane
Mass Transfer
Editor: ELSEVIER SCIENCE BV
Citation: The Journal Of Supercritical Fluids. ELSEVIER SCIENCE BV, n. 115, p. 1 - 9.
Rights: fechado
Identifier DOI: 10.1016/j.supflu.2016.04.007
Address: http://www-sciencedirect-com.ez88.periodicos.capes.gov.br/science/article/pii/S089684461630081X
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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