A5045821787- biodegradable polymer synthesis and properties
- Polymer crystallization and properties
- Polymer Nanocomposites and Properties
- Advanced Polymer Synthesis and Characterization
- Carbon dioxide utilization in catalysis
- Layered Double Hydroxides Synthesis and Applications
- Additive Manufacturing and 3D Printing Technologies
- Polymer Science and PVC
- Microplastics and Plastic Pollution
- Thermal and Kinetic Analysis
- Silicone and Siloxane Chemistry
- Rheology and Fluid Dynamics Studies
- Innovative Microfluidic and Catalytic Techniques Innovation
- Synthesis and properties of polymers
- Flame retardant materials and properties
- Electrowetting and Microfluidic Technologies
- Polymer composites and self-healing
- Material Dynamics and Properties
- Bone Tissue Engineering Materials
- Advanced Thermodynamics and Statistical Mechanics
- Chemistry and Chemical Engineering
- Lignin and Wood Chemistry
- Collagen: Extraction and Characterization
- Dielectric materials and actuators
- Mechatronics Education and Applications
University of the Basque Country
2016-2025
Polymat
2001-2024
Ayuntamiento de San Sebastián
2016
Lehigh University
2009
The structure, morphology, and thermal properties of biobased biodegradable poly(butylene succinate-ran-butylene azelate) random copolyesters with a wide composition range were studied. These PBS-ran-PBAz copolymers can crystallize in the entire despite being random, displaying eutectic point when their melting is plotted as function composition. Wide angle X-ray scattering (WAXS) studies confirmed isodimorphic behavior where PBS-rich PBS type unit cells some PBAz repeating inclusions vice...
Ring closure click chemistry methods have been used to produce cyclic c-PLLA and c-PDLA of a number-average molecular weight close 10 kg/mol. The effects stereochemistry the polymer chains their topology on structure, nucleation, crystallization were studied in detail employing wide-angle X-ray scattering (WAXS), small-angle (SAXS), polarized light optical microscopy (PLOM), standard advanced differential scanning calorimetry (DSC). crystal structures linear PLAs are identical each other, no...
High molecular weight poly[(butylene succinate)-ran-(ε-caprolactone)] copolyesters (PBS-ran-PCL) were synthesized in a wide composition range and compared with significantly lower samples previously. DSC WAXS showed that these are isodimorphic (i.e., each crystalline phase contains small amount of the second comonomer) as they able to crystallize entire display pseudoeutectic point, their unit cell dimensions function composition. Copolymers close or away from point exhibited single phase,...
In this work, we study for the first time, isothermal crystallization behavior of isodimorphic random poly(butylene succinate)-ran-poly(ε-caprolactone) copolyesters, PBS-ran-PCL, previously synthesized by us. We perform nucleation and spherulitic growth kinetics polarized light optical microscopy (PLOM) overall differential scanning calorimetry (DSC). Selected samples were also studied real-time wide angle X-ray diffraction (WAXS). Under conditions, only PBS-rich phase or PCL-rich could...
The recyclability of opaque PET, which contains TiO2 nanoparticles, has not been as well-studied that transparent PET. objective this work is to recycle post-consumer PET through reactive extrusion with Joncryl. effect the process on molecular structure and thermal/mechanical/rheological properties recycling (r-PET) analyzed. A 1% w/w Joncryl addition caused a moderate increase in weight. chain length could explain decrease overall crystallization rate. This result probably due presence...
Abstract Neodymium‐iron‐boron (NdFeB) magnets are essential because they show optimized magnetic properties for clean energy applications. They suffer nevertheless from their rare earth mine security of supply. The European Union considers them as key materials, encouraging recycling to reduce the supply dependence on other countries. In this work, biodegradable poly(ε‐caprolactone) (PCL) is used obtain PCL/NdFeB micro‐composites, with recycled NdFeB loadings 0.25, 0.50, 0.75, 1.00, and 5.00...
Poly(butylene succinate-ran-butylene azelate) random copolyesters (PBS-ran PBAz) were studied using broadband dielectric spectroscopy (BDS) and differential scanning calorimetry (DSC). These copolymers are characterized by being isodimorphic displaying a eutectic behavior. Depending on their composition, the PBS-rich phase, PBAz-rich or both phases can crystallize. The complex development of amorphous especially at compositions around point was demonstrated BDS results. comonomer fraction...
ABSTRACT Nanocomposites based on polycarbonate (PC) and different amounts of untreated graphene nanoplatelets (GnP) (from 1 to 7 wt %) were prepared by melt blending. The nanocomposites thoroughly characterized employing the following techniques: broad band dielectric spectroscopy, thermally stimulated depolarization currents, differential scanning calorimetry, tensile testing, dynamic mechanical thermal analysis, water vapor, carbon dioxide oxygen permeability measurements. presence a MWS...
ABSTRACT The structure and thermal properties of linear low‐density polyethylene (LLDPE)/medium soft paraffin wax blends, prepared by melt mixing, were investigated differential scanning calorimetry (DSC) small‐ wide‐angle X‐ray scattering (SAXS WAXS). blends form a single phase in the as determined SAXS. Upon cooling from melt, two crystalline phases develop for with more than 10 wt % characterized widely different melting points. acts an effective plasticizer LLDPE, decreasing both its...
Poly(butylene succinate-ran-butylene azelate) random copolyesters were thermally fractionated by successive self-nucleation and annealing (SSA). The samples before after SSA analyzed differential scanning calorimetry (DSC) X-ray diffraction (WAXS SAXS). WAXS results indicate that a small degree of comonomer inclusion is present in the crystalline phases are formed copolymers depending on composition: PBS-like unit cell or/and PBAz-like cell, thus confirming isodimorphic behavior samples....
The synthesis of symmetric cyclo poly(ε-caprolactone)-block-poly(l(d)-lactide) (c(PCL-b-PL(D)LA)) by combining ring-opening polymerization ε-caprolactone and lactides subsequent click chemistry reaction the linear precursors containing antagonist functionalities is presented. two blocks can sequentially crystallize self-assemble into double crystalline spherulitic superstructures. cyclic chain topology significantly affects both nucleation crystallization each constituent, as gathered from a...
The effect of adding poly(lactide-ran-caprolactone), P(LA-ran-CL), random copolymers to melt mixed poly(lactide)(PLA)/poly(ε-caprolactone)(PCL) 80/20 blends is investigated. concentration P(LA-ran-CL) copolymer added the was 2 wt% and two different types were employed. They varied in composition molecular weight. Compression molded sheets evaluated by SEM (Scanning Electron Microscopy), PLOM (Polarized Light Optical DSC (Differential Scanning Calorimetry) tensile tests. micrographs show that...
The sequential crystallization of poly(ethylene oxide)-<italic>b</italic>-poly(ε-caprolactone)-<italic>b</italic>-poly(<sc>l</sc>-lactide) (PEO-<italic>b</italic>-PCL-<italic>b</italic>-PLLA) triblock terpolymers, in which the three blocks are able to crystallize separately and sequentially from melt, is presented.
Employing the hydroxyl groups on surface of Cloisite® 30B montmorillonite (Cl30B), ring-opening polymerization L-lactide was performed with a metal-free catalyst to yield PLLA-g-Cl30B nanohybrid low Mn grafted PLLA chains (i.e., 9 kg mol−1). This then melt mixed PLA 4032D from NatureWorks, which is slow-crystallizing as it contains 2% D-isomers and has high value 123 The samples were characterized by TEM, WAXS, SAXS, DSC Polarized Light Optical Microscopy (PLOM) in order study their...
Accelerating the crystallization rate of polylactide (PLA) to extend its application range is an interesting challenge. In this work, PLA from glassy state within 80/20 PLA/PCL blends, with or without addition three different compositions poly(L-lactide-block-carbonate) (PLA-b-PC) diblock copolymers, investigated. The samples were evaluated by SEM (Scanning Electron Microscopy), PLOM (Polarized Light Optical Microscopy) and DSC (Differential Scanning Calorimetry). blends exhibit a sea-island...
ABSTRACT Hydrolytic degradation of a nanocomposite poly(L‐lactic acid), PLA, and layered double hydroxide (LDH) modified with the drug 4‐biphenyl acetic acid (Bph) has been studied. PLA/LDH‐Bph was prepared by solvent casting 5 wt % LDH hydrolytic carried out in PBS solution at pH 7.2 37 °C. Neat PLA studied as reference material (PLA/Bph). The materials were WAXS, TEM, TGA, DSC, SEM, FTIR, SEC contact angle measurements. For PLA/Bph, an catalytic effect, caused drug, accelerates mass loss....