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

  • Electro-responsive shape-memory composites obtained via dual-curing processing 

    Russo, Claudio; Ramirez Falo, José Luis; Fernández Francos, Xavier; Flor López, Sílvia de la (2022-01-01)
    Article
    Open Access
    In this work, electro-responsive shape-memory actuators were developed by incorporating a conductive heater in a dual-curing thiol-acrylate-epoxy shape-memory polymer (SMP). A conductive heater, consisting of an electrically ...
  • Controlled composite processing based on off-stoichiometric thiol-epoxy dual-curing systems with sequential heat release (SHR) 

    Fabregat Sanjuan, Albert; Fernández Francos, Xavier; Ferrando Piera, Francesc (Wiley, 2021-01-01)
    Article
    Open Access
    Control of curing rate and exothermicity during processing of thermosetting composite materials is essential in order to minimize the formation of internal stresses leading to mechanical and dimensional defects in the ...
  • Novel hybrid poly(thiourethane)/POSS covalent adaptable networks 

    Guerrero, Federico; Flor López, Sílvia de la; Ramis Juan, Xavier; Santos, Jose-Ignacio; Serra Albet, Maria Àngels (2021)
    Conference report
    Restricted access - publisher's policy
    Hybrid organic-inorganic materials have been introduced as one of the strategies to improve mechanical properties and obtaining new high-performance polymeric materials. These materials present a synergism that meets the ...
  • Dual-curing of (meth)acrylate-epoxy thiol formulations 

    Roig, Adrià; Ramis Juan, Xavier; Flor López, Sílvia de la; Serra Albet, Maria Àngels (2021)
    Conference lecture
    Restricted access - publisher's policy
    We have implemented a sequential photo-thermal dual-curing procedure based on glycidylmethacrylate/trimeth(acrylate)/thiol mixtures. The first step of the curing process is a radical UV-initiated thiol-(meth)acrylate ...
  • Epoxy Doped, Nano-scale Phase-separated Poly-Acrylates with Potential in 3D Printing 

    Konuray, Ali Osman; Bonada Bo, Jordi; Fernández Francos, Xavier; Ramis Juan, Xavier (2021-01-01)
    Article
    Open Access
    An efficient method to improve the mechanical performance of a commercially available photocure resin is described wherein the resin is modified with a mixture of a cycloaliphatic epoxy and an anhydride curing agent. ...
  • Dual-cured thermosets from glycydil methacrylate obtained by epoxy-amine reaction and methacrylate homopolymerization 

    Roig, Adrià; Ramis Juan, Xavier; Flor López, Sílvia de la; Serra Albet, Maria Àngels (2021-02-01)
    Article
    Restricted access - publisher's policy
    Dual-curing is a processing technology based in the combination of two polymerization processes and the proper selection of the formulation. This methodology allows the preparation of intermediate materials with tailored ...
  • Actuator behaviour of tailored poly(Thiourethane) shape memory thermosets 

    Gamardella, Francesco; Serra Albet, Maria Àngels; Ramis Juan, Xavier; Flor López, Sílvia de la (Multidisciplinary Digital Publishing Institute (MDPI), 2021-05-01)
    Article
    Open Access
    n this work, a new family of poly(thiourethane) shape memory thermosetting actuators was developed and characterized. These materials can be easily prepared from mixtures of two different aliphatic diisocyanates and a ...
  • Curing kinetics of dually-processed acrylate-epoxy 3D printing resins 

    Konuray, Ali Osman; Morancho Llena, José María; Fernández Francos, Xavier; García Álvarez, Montserrat; Ramis Juan, Xavier (2021-07-01)
    Article
    Restricted access - publisher's policy
    In this work, the curing kinetics of a new ternary acrylate/epoxy/anhydride thermoset system which is used for dual-curing 3D-printing applications is studied. The first curing stage is an acrylate free-radical photopolymerization ...
  • Cost-effectively 3d-printed rigid and versatile interpenetrating polymer networks 

    Konuray, Ali Osman; Bonada Bo, Jordi; Tercjak, Agnieszka; Fabregat Sanjuan, Albert; Fernández Francos, Xavier; Ramis Juan, Xavier (Multidisciplinary Digital Publishing Institute (MDPI), 2021-08-02)
    Article
    Open Access
    Versatile acrylate–epoxy hybrid formulations are becoming widespread in photo/thermal dual-processing scenarios, especially in 3D printing applications. Usually, parts are printed in a stereolithography or digital light ...
  • Sequential photo-thermal curing of (meth)acrylate-epoxy thiol formulations 

    Roig, Adrià; Flor López, Sílvia de la; Ramis Juan, Xavier; Serra Albet, Maria Àngels (2021)
    Conference lecture
    Restricted access - publisher's policy
    In this work, a novel dual-curing procedure has been developed. It is a combination of a first radical UV-initiated thiol-(meth)acrylate reaction, followed by a second thermal thiol-epoxy step catalysed by a base. Since ...
  • Dual-curable vitrimers for 3d-printing 

    Romano, Angelo; Konuray, Ali Osman; Roppolo, Ignazio; Sangermano, Marco; Fernández-Francos, Xavier; Ramis Juan, Xavier (2021)
    Conference lecture
    Open Access
    3D-printed objects can greatly benefit from the introduction of molecular structure undergoing dynamic bond exchange [1] or the use dual-curing processing [2], leading to a significant enhancement of mechanical properties ...
  • Highly exfoliated nanostructure in trifunctional epoxy/clay nanocomposites using boron trifluoride as initiator 

    Hutchinson, John M.; Shiravand, Fatemeh; Calventus Solé, Yolanda; Fernández Francos, Xavier; Ramis Juan, Xavier (Wiley, 2014-03-15)
    Article
    Open Access
    Epoxy/clay nanocomposites based upon a trifunctional epoxy resin, triglycidyl p-amino phenol (TGAP), have been prepared by intercalating an initiator of cationic homopolymerization, a boron trifluoride monoethylamine ...

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