L’activitat del grup es centra fonamentalment en el camp de les resines epoxi amb propietats millorades. Les millores pretenen incidir en certs problemes que presenten aquests materials com per exemple la seva baixa degradabilitat que impossibilita la recuperació dels substrats en els recobriments, la contracció i les tensions generades durant el curat i l’elevada fragilitat dels materials un cop reticulats. Actualment el grup està treballant en la preparació i caracterització de nous termoestables obtinguts a partir de mescles de resines epoxídiques, amb i sense càrregues inorgàniques i polímers dendrítics, comercials o sintetitzats per nosaltres, amb diferents estructures, dissenyades per tal d’aconseguir les millores esmentades, especialment l’augment de la tenacitat. Darrerament el grup està iniciant treballs amb sistemes epoxídics amb memòria de forma i amb curats B-stage, especialment indicats per afavorir l’emmagatzament i manipulació de les formulacions.

The objective of the group is to study the thermal, physical and chemical properties of materials in relation to thermodynamics and thermal analysis techniques. During the last few years, the group has studied the calorimetric, thermomechanical and dielectric properties of the following materials: polymer concretes, thermosetting resins, both pure and in a composite matrix, polymer blends, interpenetrating polymer networks, thermosetting paints, and biodegradable polyolefins. The knowledge acquired by the group and the specialised use of different instrumental techniques allow it to work both on the characterisation of materials as well as on their transformation processes. These activities include the study of the following: structural relaxation, processes related to phase transformation and phase separation, processes related to durability and thermal stability, the kinetics of chemical reactions (polymerisation, dynamic and isothermal curing, thermal and thermo-oxidative degradation) and physical ageing. They also include the determination of the following properties: a) thermal properties (specific heats, thermal expansion coefficients, phase change enthalpies, heats of reaction and glass transition temperatures), b) mechanical properties (expansion coefficient, storage and loss modulus and loss factor), c) dielectric properties (dielectric permittivity and loss factor) and d) thermo-optical properties. The techniques used to perform these activities are the following: a) differential scanning calorimetry, both conventional and temperature-modulated, and tensional calorimetry, b) mechanical analysis (dynamic mechanical thermal analysis, thermomechanical analysis and creep), c) dielectric analysis, d) thermogravimetric analysis, e) optical thermal microscopy and e) infra-red spectroscopy with thermal control. At the present time, the group is working on the thermal and ultraviolet radiation curing of polymers and thermosetting resins. The study includes the optimisation of photocuring and its application in obtaining thermosets that have low contraction, as well as the synthesis and characterisation of nanocomposites of epoxy resins and laminar silicates. The group is part of the Thermal Energy Research Group, which is considered a consolidated research group by the Generalitat of Catalonia¿s General Directorate of Research (DGR). The academic objectives of the group are concerned with the teaching of thermodynamics and related subjects, such as thermal analysis, physical chemistry, the study of energy transformations and systems of energy storage, among others.

The objective of the group is to study the thermal, physical and chemical properties of materials in relation to thermodynamics and thermal analysis techniques. During the last few years, the group has studied the calorimetric, thermomechanical and dielectric properties of the following materials: polymer concretes, thermosetting resins, both pure and in a composite matrix, polymer blends, interpenetrating polymer networks, thermosetting paints, and biodegradable polyolefins. The knowledge acquired by the group and the specialised use of different instrumental techniques allow it to work both on the characterisation of materials as well as on their transformation processes. These activities include the study of the following: structural relaxation, processes related to phase transformation and phase separation, processes related to durability and thermal stability, the kinetics of chemical reactions (polymerisation, dynamic and isothermal curing, thermal and thermo-oxidative degradation) and physical ageing. They also include the determination of the following properties: a) thermal properties (specific heats, thermal expansion coefficients, phase change enthalpies, heats of reaction and glass transition temperatures), b) mechanical properties (expansion coefficient, storage and loss modulus and loss factor), c) dielectric properties (dielectric permittivity and loss factor) and d) thermo-optical properties. The techniques used to perform these activities are the following: a) differential scanning calorimetry, both conventional and temperature-modulated, and tensional calorimetry, b) mechanical analysis (dynamic mechanical thermal analysis, thermomechanical analysis and creep), c) dielectric analysis, d) thermogravimetric analysis, e) optical thermal microscopy and e) infra-red spectroscopy with thermal control. At the present time, the group is working on the thermal and ultraviolet radiation curing of polymers and thermosetting resins. The study includes the optimisation of photocuring and its application in obtaining thermosets that have low contraction, as well as the synthesis and characterisation of nanocomposites of epoxy resins and laminar silicates. The group is part of the Thermal Energy Research Group, which is considered a consolidated research group by the Generalitat of Catalonia¿s General Directorate of Research (DGR). The academic objectives of the group are concerned with the teaching of thermodynamics and related subjects, such as thermal analysis, physical chemistry, the study of energy transformations and systems of energy storage, among others.

Recent Submissions

  • Curing and thermomechanical properties of off-stoichiometric anhydride-epoxy thermosets 

    Morancho Llena, José María; Ramis Juan, Xavier; Fernández Francos, Xavier; Salla Tarragó, José María; Konuray, Ali Osman; Serra Albet, Maria Àngels (Springer, 2019-11)
    Article
    Restricted access - publisher's policy
    n the present work, we report the preparation and characterization of a new family of thermosets based on off-stoichiometric anhydride–epoxy formulations in the presence of an anionic initiator. Diglycidyl ether of bisphenol ...
  • A new class of vitrimers based on aliphatic poly(thiourethane) networks with shape memory and permanent shape reconfiguration 

    Gamardella, Francesco; Guerrero, Federico; Flor López, Sílvia de la; Ramis Juan, Xavier; Serra Albet, Maria Àngels (Elsevier, 2019-01-05)
    Article
    Restricted access - publisher's policy
    Vitrimers are a new promising class of polymeric materials which are attracting increasing attention thanks to their thermosetting characteristics with their capability of being reprocessed and recyclable, which make them ...
  • Acetoacetate based thermosets prepared by dual-Michael addition reactions 

    Konuray, Ali Osman; Fernández Francos, Xavier; Ramis Juan, Xavier; Serra Albet, Maria Àngels (Multidisciplinary Digital Publishing Institute (MDPI), 2019-01-01)
    Article
    Open Access
    A novel set of dual-curable multiacetoacetate-multiacrylate-divinyl sulfone ternary materials with versatile and manipulable properties are presented. In contrast to common dual-curing systems, the first stage polymer ...
  • Thermosetting materials from eugenol derivatives 

    Guzman, Dailyn; Serra Albet, Maria Àngels; Ramis Juan, Xavier (Nova Science Publisher, 2019-04)
    Part of book or chapter of book
    Restricted access - publisher's policy
    Green chemistry explores safer ways to prepare new materials from renewable resources. Thermosets are generally prepared from a mixture of monomers, with at least one of them having three or more reactive functions. This ...
  • Rheological and mechanical characterization of dual-curing thiol-acrylate-epoxy thermosets for advanced applications 

    Russo, Claudio; Fernández Francos, Xavier; Flor López, Sílvia de la (Multidisciplinary Digital Publishing Institute (MDPI), 2019-06-01)
    Article
    Open Access
    Mechanical and rheological properties of novel dual-curing system based on sequential thiol-acrylate and thiol-epoxy reactions are studied with the aim of addressing the obtained materials to suitable advanced applications. ...
  • Tailor-made thermosets obtained by sequential dual-curing combining isocyanate-thiol and epoxy-thiol click reactions 

    Gamardella, Francesco; Sabatini, Valentina; Ramis Juan, Xavier; Serra Albet, Maria Àngels (Elsevier, 2019-06-12)
    Article
    Restricted access - publisher's policy
    In this work, a new family of thermosets based on thiol-isocyanate-epoxy networks has been prepared via sequential dual-curing methodology where both reactions are activated by temperature. The sequential dual behaviour ...
  • Time-temperature-transformation (TTT) diagram of dual-curable epoxy thermosets obtained via two sequential epoxy-amine condensations 

    Konuray, Ali Osman; Salla Tarragó, José María; Morancho Llena, José María; Fernández Francos, Xavier; García Álvarez, Montserrat; Ramis Juan, Xavier (2019-08-01)
    Article
    Restricted access - publisher's policy
    A simple and robust strategy to generate time-temperature-transformation (TTT) diagrams for dual-curable thermosets is presented. TTT diagram is built for a dual-curable amine-epoxy formulation. Both curing stages are ...
  • Hard epoxy thermosets obtained via two sequential epoxy-amine condensations 

    Konuray, Ali Osman; García, Aina; Morancho Llena, José María; Fernández Francos, Xavier; Serra Albet, Maria Àngels; Ferrando Piera, Francesc; García Álvarez, Montserrat; Ramis Juan, Xavier (Elsevier, 2019-07-01)
    Article
    Restricted access - publisher's policy
    A new family of dual-curable poly(ß-hydroxyamine ether) thermosets based on amine-epoxy formulations has been prepared and characterized. Both curing stages consist in an epoxy-amine polycondensation, each having different ...
  • Achieving high thermal conductivity in epoxy composites: Effect of boron nitride particle size and matrix-filler interface 

    Moradi, Sasan; Calventus Solé, Yolanda; Román Concha, Frida Rosario; Hutchinson, John M. (Multidisciplinary Digital Publishing Institute (MDPI), 2019-07-06)
    Article
    Open Access
    For the thermal management of high watt density circuit layers, it is common to use a filled epoxy system to provide an electrically insulating but thermally conducting bond to a metal substrate. An epoxy-thiol system ...
  • Kinetics analysis and simulation of sequential epoxy dual-curing systems with independent thermal activation 

    Santín Serrano, David; Konuray, Ali Osman; Fernández Francos, Xavier; Ramis Juan, Xavier (2019-03-01)
    Article
    Restricted access - publisher's policy
    The curing kinetics of a sequential dual-curing system based on an off-stoichiometric amine-epoxy formulation with intermediate latent reactivity has been analyzed. The first curing stage is an epoxy-amine polycondensation ...
  • Characterization of sequential dual-curing of thiol-acrylate-epoxy systems with controlled thermal properties 

    Russo, Claudio; Serra Albet, Maria Àngels; Fernández Francos, Xavier; Flor López, Sílvia de la (Elsevier, 2019-03-01)
    Article
    Restricted access - publisher's policy
    In this work, a novel sequential dual-curing system based on thiol-acrylate-epoxy formulations is developed and characterized. Both reaction stages are thermally activated and sequentially relies on difference in the ...
  • New epoxy composite thermosets with enhanced thermal conductivity and high Tg obtained by cationic homopolymerization 

    Isarn Garcia, Isaac; Gamardella, Francesco; Massagués, Lluís; Fernández Francos, Xavier (2018-06-01)
    Article
    Open Access
    Thermal dissipation is a critical aspect for the performance and lifetime of electronic devices. In this work, novel composites based on a cycloaliphatic epoxy matrix and BN fillers, obtained by cationic curing of mixtures ...

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