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Microreactor generated RAFT imprinted smart hydrogels
Kadhirvel, Porkodi; Dias, Rolando; Costa, Mário RuiStimuli-Responsive Smart Hydrogels (SRSH) are extensively used in biotechnology and biomedicine amongst many other fields1. SRSH can be obtained conventionally through a batch reactor process resulting in irregular shaped particles, whereas emulsion, inverse-suspension, precipitation polymerizations, etc., lead mostly to spherical shaped particles. Recently micro-reactors have been introduced as an alternative ...
Development of stimuli-responsive smart hydrogels using molecular imprinting an...
Oliveira, Tânia; Reitor, Patrícia; Oliveira, Daniela; Kadhirvel, Porkodi; Dias, Rolando; Costa, MárioDifferent classes of stimuli-responsive smart hydrogels (SRSH) were synthesized in order to assess the usefulness of molecular imprinting and generation of interpenetrating polymer networks to obtain advanced materials with tailored properties/performance. Reversible Addition-Fragmentation Chain-Transfer (RAFT) polymerisation was exploited as an additional tool to increase the control on the formation process o...
Synthesis and testing of polymer crosslinked materials for applications in ener...
Tristão, Paulo; Costa, Hugo; Kadhirvel, Porkodi; Dias, Rolando; Costa, MárioThe feasibility of making polymer crosslinked materials with applications in improving energy efficiency is here demonstrated. The encapsulation of phase change materials (PCM), for thermal energy storage/release, and sulphur inverse-vulcanization (producing materials with useful electrochemical properties) are here used as case studies. Effective thermal properties of the produced encapsulated PCM materials we...
Assessment of RAFT polymerization in the synthesis of crosslinked materials for...
Tristão, Paulo; Costa, Hugo; Kadhirvel, Porkodi; Dias, Rolando; Costa, MárioThe synthesis and characterization of two different classes of polymer crosslinked materials, useful for energy storage and improving energy efficiency, is here studied. Products resulting from the encapsulation of phase change materials (PCM), which can be used for thermal energy storage/release, are considered as first case study. For this purpose, different kinds of PCM can be considered in the encapsulation...
Development of tailored hydrogels using RAFT polymerization in continuous flow ...
Machado, Carla; Oliveira, Tânia; Reitor, Patrícia; Oliveira, Daniela; Freitas, Filipa; Kadhirvel, Porkodi; Dias, Rolando; Costa, MárioThis research is devoted to the development of tools aiding the production of smart hydrogels with tailored molecular architecture and properties. Molecular imprinting, RAFT polymerization and operation in continuous flow microreactor are individually considered and also simultaneously combined in order to try the synthesis of materials with improved performance.
Kinetic studies on RAFT inverse-suspension smart hydrogels formation using a te...
Gonçalves, Miguel; Pinto, Virgínia; Dias, Rolando; Costa, Mário Rui; Hernándes-Ortiz, JúlioTemperature/pH stimuli-responsive hydrogel particles were synthesized using inverse-suspension polymerization in batch stirred reactor. Different water soluble comonomers were present in the initial mixture (namely N-isopropylacrylamide and acrylic acid) as well as crosslinkers with different functionalities (bi-, tri- and tetrafunctional) so that their effect on the network crosslinking density could be seen. ...
Modelling studies on RAFT copolymerisation of styrene/divinylbenzene in aqueous...
Gonçalves, Miguel; Pinto, Virgínia; Dias, Rolando; Costa, Mário Rui; Hernándes-Ortiz, JúlioExperimental and theoretical studies concerning the RAFT copolymerization of styrene (S) and commercial divinylbenzene (DVB) were performed in order to assess the use of controlled radical polymerization (CRP) for the production of nonconventional polymer networks. Aqueous suspension polymerizations were carried out at a 1 L scale in a stirred batch reactor and changes of a few operation parameters were tried i...
NMRP of styrene-divinylbenzene: predictions in the pre- and post-gelation perio...
Aguiar, Leandro; Gonçalves, Miguel; Pinto, Virgínia; Dias, Rolando; Costa, Mário Rui; Giudici, ReinaldoThree modeling approaches for the NMRP of slyrene-divinylbenzene were used for describing experiments performed at different initial conditions: a rigorous approach (model A) based on balance of species and method of characteristics in terms of generating functions and two simplified approaches based upon mass and moment balances, numerical fractionation and pseudo-kinetic method (models B and C). Balances of p...
Mathematical modeling of styrene/divinylbenzene copolymerization comprising dif...
Aguiar, Leandro; Gonçalves, Miguel; Pinto, Virgínia; Dias, Rolando; Giudici, Reinaldo; Costa, Mário RuiMathematical Modeling of Styrene/Divinylbenzene Copolymerization Comprising Diffusional Effects and Cyclization Kinetics
Inverse-suspension production of hydrogels : kinetic modeling and product cha...
Gonçalves, Miguel; Pinto, Virgínia; Dias, Rolando; Costa, Mário RuiHydrogels find important applications in drug and gene delivery, tissue engineering, bio-separations and different fields of biomedicine.1 End-use properties of such polymer networks are dependent on their structural topology which is affected by the production process used. Formation of non-ideal networks due to reduced reactivity of pendant double bonds and/or cyclization are some mechanisms hindering the pre...
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