POLTEPO - Polímers Termoestables Epoxídics
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.
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Articles de revista [101]
Recent Submissions
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Thiol-Ene Networks with Tunable Dynamicity for Covalent Adaptation
(American Chemical Society (ACS), 2022-01-01)
Article
Open AccessTo be fully recyclable, covalent adaptable networks must ultimately be able to overcome all topological restrictions and flow. By using a statistically based method, it was shown that the extent of stress relaxation in ... -
Optimization and testing of hybrid 3D printing vitrimer resins
(Multidisciplinary Digital Publishing Institute (MDPI), 2022-11-24)
Article
Open AccessThe quality of photocure-based 3D printing greatly depends on the properties of the photoresin. There are still many challenges to be overcome at the material level before such additive manufacturing methods dominate the ... -
Vitrimeric Epoxy-Amine Polyimine Networks Based on a Renewable Vanillin Derivative
(American Chemical Society (ACS), 2022-01-01)
Article
Open AccessA series of bio-based polyimine vitrimers was obtained and characterized. A diimine-diglycidyl monomer (DIDG) was synthesized by condensing vanillin with 4,4'-oxydianiline (ODA) and further glycidylation with epichlorohydrin. ... -
3D printable hybrid acrylate-epoxy dynamic networks
(Elsevier, 2022-06)
Article
Open AccessPolymer networks with dynamic bonds, also known as covalent adaptable networks (CANs) combine the superior mechanical properties and chemical resistance of thermosets with the ability to be reprocessed, a feat formerly ... -
Nous politiouretans hibrids tipus vitrimèric. sintesi i caracterització
(2022)
Conference lecture
Restricted access - publisher's policyLa preparació de materials híbrids orgànics-inorgànics és una de les estratègies utilitzades per millorar les propietats mecàniques i obtenir materials polimèrics d’altes prestacions. Aquest materials combinen la duresa i ... -
New bio-based poly(acylhydrazone) vitrimers: synthesis and characterization
(2022)
Conference lecture
Restricted access - publisher's policy -
Appplication of renewable thiols in the preparation of poly(thiourethane) covalent adaptable networks
(2022)
Conference lecture
Restricted access - publisher's policyOne of the industries most dependent on fossil fuels is the polymer industry: over 99% of polymer production uses monomers derived from oil and gas. For this reason, polymers derived from biomass (biopolymers) are widely ... -
Toward the recyclability of thermosetting polymers
(De Gruyter, 2022-11-07)
Part of book or chapter of book
Restricted access - publisher's policyPolymers, commonly known with the generic term “plastics,” are nowadays key materials in many industrial sectors and in our daily life. The word “polymer” is derived from the Greek words “polis” (many) and “meros” (part). ... -
Preparation of New Vitrimeric Materials Based on Glycidyl Vanillin-imines
(2022)
Conference lecture
Open AccessThe current exponential growth of the human population is associated with a degradation of the environment. In terms of lack of degradability and persistence in the environment, increasing attention is being paid to polymers. ... -
Synthesis and characterization of new fully bio-based poly(acylhydrazone) vanillin vitrimers
(2022)
Conference report
Open AccessIn the present century the need to recycle thermosets to reach a sustainable environment has led a huge number of researchers to develop new reshapable networked polymers. In this scenario, vitrimers, materials able to ... -
Stress-relaxing thermosets with easily regulated bond exchange kinetics
(2022)
Conference lecture
Open AccessWe have carried out stress-relaxation experiments on poly(acrylate) and poly(thiol-ene) based thermosets prepared from in-house synthesized epoxy-acid adducts with acrylate (for the former) and ene functionalities (for the ... -
Novel hybrid organic/inorganic poly (thiourethane) covalent adaptable networks
(Elsevier, 2022-07-05)
Article
Open AccessOrganic-inorganic hybrid materials combine the advantages of both phases: hardness and strength of inorganic phase and elasticity and toughness of the organic matrix. In the present study, we have prepared nanocomposites ...