A5049901906- Polymer Nanocomposites and Properties
- Polymer crystallization and properties
- Conducting polymers and applications
- Fuel Cells and Related Materials
- Advanced Sensor and Energy Harvesting Materials
- Carbon Nanotubes in Composites
- biodegradable polymer synthesis and properties
- Dielectric materials and actuators
- Advanced Battery Materials and Technologies
- Synthesis and properties of polymers
- Natural Fiber Reinforced Composites
- Advanced Battery Technologies Research
- Material Dynamics and Properties
- Smart Materials for Construction
- Fiber-reinforced polymer composites
- Material Properties and Applications
- Polymer Nanocomposite Synthesis and Irradiation
- Polymer Science and PVC
- Ionic liquids properties and applications
- Material Properties and Processing
- Graphene research and applications
- Synthesis of heterocyclic compounds
- Electronic Packaging and Soldering Technologies
- Analytical Chemistry and Sensors
- Polymer composites and self-healing
Instituto de Estructura de la Materia
2013-2023
Universitat de Barcelona
2008-2021
Consejo Superior de Investigaciones Científicas
2001-2018
Instituto de Investigaciones Químicas y Ambientales de Barcelona
2008
University of Alicante
2004-2008
Instituto de Ciencia y Tecnología de Polímeros
1991-2005
Chemo (Spain)
1991-1995
Universitat de València
1988
This work demonstrates the use of wetting nanoporous alumina template with polymer solution to produce arrays isolated poly(vinylidene fluoride) (PVDF) ferroelectric gamma-type nanorods supported within a nonpolar alpha-structure film. The method is based upon crystal phase transition which occurs due PVDF confinement nanoporous. system was studied using scanning X-ray microdiffraction (micro-XRD) that allows solid-solid from alpha-nonpolar form (bulk) gamma polar (nanorod array) be...
A study is presented of the electrical properties a series nanocomposites based on high density polyethylene (HDPE) as matrix and either carbon nanofiber (CNF) or multiwall nanotube (MWCNT) nanoadditive. The measurements conductivity over broad-band frequencies (10−2 > F/Hz 109) allow improvement description polymer nanofibers nanotubes. Despite lack continuous conducting network between particles at low concentrations, exhibit significant dc due to tunnel conduction. At nanoadditive...
The successful development of ferroelectric polymer devices depends on the effective fabrication polar crystalline nanostructures. We demonstrate, by scanning X-ray microdiffraction using synchrotron light, heterogeneous character high aspect ratio one-dimensional nanoarrays poly(vinylidene fluoride-co-trifluoroethylene) copolymers supported a residual film. They were prepared melt and solution template wetting, porous anodic aluminum oxide as template. spatial evolution different polymorphs...
The chemical structure-dynamics relationship for poly(trimethylene 2,5-furanoate) and 1,4-cyclohexanedicarboxylate) was investigated via dielectric spectroscopy compared with that of terephthalate) in order to evaluate the impact on subglass dynamics nature ring. Further comparison accomplished neopentyl glycol containing counterparts: poly(neopentyl 1,4-cyclohexanedicarboxylate). Our study reveals a multimodal β process. For more flexible polymers (containing cyclohexane rings) three modes...
A series of aliphatic-aromatic copolyesters based on poly(butylene terephthalate) (PBT) and poly(lactic acid) (PLA) have been synthesized by means a novel reactive blending procedure coupled with polycondensation in melt.The obtained copolymers were further compared PBT PLA homopolymers PBT/PLA non-compatibilized physical blends order to investigate the effect transesterification reactions structural, morphological, thermal mechanical performance.Properties materials found strictly dependent...
Infrared spectroscopy (IR) and Broadband Dielectric Spectroscopy (BDS) experiments have been performed in poly(trimethylene 2,5-furanoate)(PTF) terephthalate)(PTT) below their glass transition temperatures. The BDS reveal a richer inter-molecular dynamic for PTT as characterized by multimodal β relaxation contrast with the monomodal one exhibited PTF. evolution temperature of comparable IR absorption bands is very similar PTF shows small shifts wavenumbers towards lower values, exception...
The effect of dipalmitoyl phosphatidylcholine (DPPC)/dihexanoyl (DHPC) bicelles on the microstructure pig stratum corneum (SC) in vitro was evaluated. physicochemical characterization these nanoaggregates revealed small disks with diameters around 15 nm and a thickness 5.4 nm. Upon dilution, grow transform into vesicles. Cryogenic scanning electron microscopy (cryo-SEM) images SC pieces treated this system showed vesicles about 200 lamellar-like structures intercellular lipid areas. These...
Abstract The relaxation behavior of a series compatible poly(vinylidene fluoride) (PVDF) and poly(vinyl acetate) (PVA) blends has been investigated by dielectric spectroscopy in broad frequency temperature range. Blends with PVDF content higher than 60% weight are semicrystalline. Semicrystalline show (α c ) occurring the crystalline phase PVDF. Both semicrystalline amorphous exhibit two processes, α β associated to overall segmental dynamics localized motions phase, respectively. For high...
Abstract Short glass fiber reinforced polypropylene is one of the composites with widest range applications in plastics industry. The partial replacement fibers by sepiolite, brings forth a hybrid composite better mechanical properties and, as result, enhanced compatibility and interfacial adhesion consequence surface sepiolite. results obtained are also interesting from practical point view, they allow for considerable reductions costs formulation.
We report the preparation of semicrystalline polymer nanorods PTT and its nanocomposites with SWCNTs by infiltration molten into disordered anodic alumina membranes. An accurate study crystalline orientation these systems has been accomplished means X-ray microdiffraction. While residual film exhibits isotropic character, edge-on lamellae are formed upon approaching polymer/membrane interface. This effect might be due to elongational flow that takes place in state as chains infiltrate AAO...
ABSTRACT Single‐walled carbon nanotubes (SWCNT)/expanded graphite (EG)/poly(trimethylene terephthalate) (PTT) hybrid nanocomposites were prepared via in situ polymerization. Raman spectroscopy and scanning electron microscopy (SEM) employed to determine both, purity morphology of the nanofillers dispersion nanosheets. The electrical optical properties thin polymer films based on both “single” studied. For PTT/SWCNT nanocomposites, results confirmed that transmittance decreases as...
In the present study, a fully plant-based sustainable copolyester series, namely poly(butylene 2,5-furandicarboxylate)-block-poly(caprolactone)s (PBF-block-PCL)s were successfully synthesized by melt polycondensation combining butylene 2,5-furandicarboxylate with polycaprolactone diol (PCL) at different weight ratios. Differential scanning calorimetry (DSC) showed that only PBF underwent melting, crystallization from melt, and cold crystallization. Thermogravimetric analysis (TGA) revealed...
Multi-walled carbon (MWCNT) and tungsten disulfide (INT-WS2) nanotubes are materials with excellent mechanical properties, high electrical thermal conductivity. These special properties make them candidates for strength electrically conductive polymer nanocomposite applications. In this work, the possibility of improvement mechanical, poly(trimethylene terephthalate) (PTT) by introduction MWCNT INT-WS2 was investigated. The PTT nanocomposites low loading were prepared in situ polymerization...
In this article, we have studied thermal and dielectric conductivity morphology of polycarbonate (PC)/ethylene–propylene copolymer (EPC)/multiwalled carbon nanotubes (MWCNTs) nanocomposites. Transmission electron microscopy has been used to investigate the localization migration MWCNTs within matrix. The were located in PC phase at interface EPC. results showed that decreased with increasing content EPC elastomeric particles. However, same time, one could observe an increase polymer blends...
Abstract A series of blends with various compositions was prepared on the basis polysulfone, polyethersulfone, and polyimide. These were characterized by different techniques, including Fourier transform IR spectroscopy, differential scanning calorimetry, dynamic mechanical analysis, tensile stress–strain measurements. The results obtained allowed for certain conclusions regarding blend compatibility. In addition, properties subjected to an experimental test design measure break strength...
The effect of confinement by crystals on the α relaxation, observed dielectric broadband spectroscopy, in isotropic as well oriented semicrystalline poly(vinilydene fluoride), is analyzed basis a new thermodynamic model. In both samples, it has been found that average free-energy barrier, ΔF, for conformational rearrangements same order dispersion barrier heights, δ(ΔF), around i.e., increase height rearrangement accompanied an heterogeneity constraining conditions. At given temperature T,...