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Superhydrophobic to superhydrophylic biomimetic poly(3-hydroxybutyrate) surface...
González-Obeso, Constancio; Song, Wenlong; Rodriguez-Perez, M. A.; Mano, J. F.Biodegradable and biocompatible materials have gained increased attentions because of their applications in biomedicine and tissue engineering. Among them, poly(3-hydroxybutyrate) (PHB), a natural origin polymer, has been employed in biomedical applications as a suitable substitute of synthetic polymers for preparing scaffolds and other devices. In this context it is relevant to understand the interactions betw...
Modification of paper using polyhydroxybutyrate to obtain biomimetic superhydro...
González-Obeso, Constancio; Sousa, M. P.; Wenlong Song; Rodriguez-Perez, M. A.; Bhushan, Bharat; Mano, J. F."Available online 6 October 2012" ; Inspired in nature, the creation of synthetic superhydrophobic surfaces is nowadays a major object of study, with many potential applications in different fields. The fabrication of such substrates has been dominated by the use of non biodegradable and poorly flexible materials, using expensive and complex procedures. To overcome this issue, we propose a simple concept for f...
Dynamic mechanical behavior of starch-based scaffolds in dry and physiologicall...
Ghosh, Satyabrata; Gutierrez, Victor; Fernández, Carolina; Rodriguez-Perez, M. A.; Viana, J. C.; Reis, R. L.; Mano, J. F.The three-dimensional scaffolds of a blend of starch and poly(L-lactic) acid, SPLA70, were produced using compression molding of polymer/salt mixture followed by leaching of salt. One series of scaffolds were prepared with varying polymer-to-salt ratio while keeping the salt size constant, and the other series of scaffolds were prepared with varying salt sizes while keeping the polymer-to-salt ratio constant. T...
Glass transition of semi-crystalline PLLA with different morphologies as studi...
Picchioci, R.; Yang, Y.; Rodriguez-Perez, M. A.; Alves, N. M.; Mano, J. F.Poly(L-lactic acid) was crystallized from the glassy state at different temperatures to produce fully transformed semi-crystalline specimens exhibiting different lamellar morphologies. The materials were tested by dynamic mechanical analysis, where a Tg decrease was found with an increasing crystallization temperature. Considering a three-phase model, this tendency was related to the corresponding increase in t...
Microhardness of starch based biomaterials in simulated physiological conditions
Alves, N. M.; Saiz-Arroyo, C.; Rodriguez-Perez, M. A.; Reis, R. L.; Mano, J. F.In this work the variation of the surface mechanical properties of starch-based biomaterials with immersion time was followed using microhardness measurements. Two blends with very distinct water uptake capabilities, starch/cellulose acetate (SCA) and starch/poly- (e-caprolactone) (SPCL), were immersed in a phosphate buffer solution (PBS) at 37.5 C for various times. The microhardness of the blends decreased s...
In vitro monitoring of surface mechanical properties of poly(L-lactic acid) usi...
Saiz-Arroyo, C.; Wang, Y.; Rodriguez-Perez, M. A.; Alves, N. M.; Mano, J. F.Poly(L-lactic acid) (PLLA) was immersed in a simulated body fluid (SBF) solution at 37.58C for distinct times. The variation of the surface mechanical properties of PLLA samples with immersion time was followed by microhardness. These measurements showed that PLLA microhardness decreased significantly ( 60%) after only 30 days of immersion. The results were explained in terms of hydrolytic degradation of the s...
Thermal and thermomechanical behaviour of polycaprolactone and starch/polycapro...
Wang, Y.; Rodriguez-Perez, M. A.; Reis, R. L.; Mano, J. F.Polycaprolactone (PCL) and starch/PCL blends (SPCL) are shown to have the potential to be used in a range of biomedical applications and can be processed with conventional melting-based procedures. In this paper, the thermal and thermomechanical analyses of PCL and SPCL were performed, using DSC, optical microscopy and DMA. Starch effectively increased the non-isothermal crystallisation rate of PCL. Non-isother...
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