Please use this identifier to cite or link to this item:
https://hdl.handle.net/10216/102715
Author(s): | Joana Fidalgo Adélio M. Mendes Fernão D. Magalhães |
Title: | Physicomechanical characterization of monodisperse multivesiculated polyester particles |
Issue Date: | 2014 |
Abstract: | This work describes physicomechanical properties of low-density polyester particles with multi-alveolar inner morphology, obtained via a water/oil/water double emulsion process. Monodisperse particle diameters were produced thanks to the use of a microchannel T-junction device for droplet generation. The drying conditions tested showed that rapid water evaporation at 120 degrees C, combined with slow diffusion towards the exterior, causes internal fracture and particle deformation. Interestingly, all particles present virtually identical internal damage and external deformation features under these drying conditions, demonstrating the uniformity in internal structures. Drying at 70 degrees C allows for efficient water removal with no damage. Thermomechanical transitions and thermal stability were analyzed by dynamic mechanical analysis (DMA in single-particle compression mode), dynamic scanning calorimetry (DSC) and thermogravimetry (TG). The effectiveness of curing conditions was evaluated by FTIR and DSC, allowing to identify the need of a thermal post-treatment for consumption of residual styrene. The consequent increase in degree of crosslinking produced a positive shift in glass transition temperature measured by DMA. Finally, mechanical reinforcement of the multivesiculated polyester particles was obtained by loading the polymer with surface-modified fumed silica, yielding 75% increase in storage modulus. |
Subject: | Engenharia química, Engenharia química Chemical engineering, Chemical engineering |
Scientific areas: | Ciências da engenharia e tecnologias::Engenharia química Engineering and technology::Chemical engineering |
URI: | https://hdl.handle.net/10216/102715 |
Related Information: | info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projectos de I&DT em Todos os Domínios Científicos/PTDC/EQU-EQU/112151/2009/Sistema microfluído para síntese de partículas vesiculadas/PTDC/EQU-EQU/112151/2009 |
Document Type: | Artigo em Revista Científica Internacional |
Rights: | restrictedAccess |
Appears in Collections: | FEUP - Artigo em Revista Científica Internacional |
Files in This Item:
File | Description | Size | Format | |
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105557.pdf Restricted Access | artigo original publicado | 1.63 MB | Adobe PDF | Request a copy from the Author(s) |
105557.1.pdf | Post-Print version | 760.06 kB | Adobe PDF | View/Open |
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